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Journal articles on the topic 'Multipath fading'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

KRSTIĆ, DRAGANA, SUAD SULJOVIĆ, MIHAJLO STEFANOVIĆ, MUNEER MASADEH BANI YASSEIN та DANIJELA ALEKSIĆ. "New Results and Applications about the Level Crossing Rate of SC Receiver output Signal in the Presence of Gamma Shadowing and k-μ or Rician Multipath Fading". WSEAS TRANSACTIONS ON CIRCUITS AND SYSTEMS 20 (28 червня 2021): 118–27. http://dx.doi.org/10.37394/23201.2021.20.15.

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In this paper,the wireless communication system with dual SC receiver operating over shadowed multipath fading channel is considered. The multipath fadingis k-μor Rician.The received signal experiences the short term fading which is resulting in SC receiver envelope variation and Gamma long term fading resulting in SC receiver envelope power variation. The closed form expressions for joint probability density functions of SC receiver output signal envelope and their first derivative of SC receiver output signal envelope are calculated for both, k-μand Rician fading. These expressions are used

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Zhang, Ping Hua, Xiu Liang Huang, and Zhong Yue He. "Research of Anti-Multipath Interference Capability in Direct Sequence Spread Spectrum Communication System by Simulation." Advanced Materials Research 846-847 (November 2013): 592–95. http://dx.doi.org/10.4028/www.scientific.net/amr.846-847.592.

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The effects of multipath fading with time delay longer or shorter than one chip interval on DSSS system are mathematically and experimentally researched. Simulation results indicate that DSSS system can efficiently overcome multipath fading in multipath Rayleigh Fading channels. And the spreading gain is not the higher the better, it must be chosen reasonably.

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Singh, Rupender, and Meenakshi Rawat. "Closed-form Distribution and Analysis of a Combined Nakagami-lognormal Shadowing and Unshadowing Fading Channel." Journal of Telecommunications and Information Technology, no. 4 (December 30, 2016): 81–87. http://dx.doi.org/10.26636/jtit.2016.4.765.

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The realistic wireless channels face combined (time shared) Nakagami-lognormal shadowing and unshadowing fading because of time varying nature of radio channel and mobile user. These channels can be modeled as time-shared sum of multipath-shadowing and unshadowing Rician distributions. These fading create severe problems in long distance wireless systems where multipath fading is superim-posed on shadowing fading (called multipath-shadowing fading). The multipath effect can be modeled using Rayleigh, Rician, Nakagami-m or Weibull distribution and shadowing effect is modeled using lognormal dis

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Gajanada, I. Gede Arya Gangga, Nyoman Pramaita, and I. Gusti Agung Komang Diafari Djuni Hartawan. "Design of Orthogonal Variable Spreading Factor (OVSF) Performance Simulation Program in Multipath Fading Channels." Journal of Electrical, Electronics and Informatics 4, no. 2 (2020): 64. http://dx.doi.org/10.24843/jeei.2020.v04.i02.p05.

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The characteristics of wireless channel are determined by multipath propagation. The transmitted signal will be scattered so that it produces fading. Fading influenced by multipath component will cause delay spread which damages the signal. Thus, spread spectrum technology is used by using a bandwidth that is greater than the original signal. The objective of this study was to determine the effect of the number of multipath components on orthogonal variable spreading factor (OVSF) codes on multipath fading channels viewed from values and Bit Error Rate (BER) graphs versus Energy Bits per Noise

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Wang, Jin Peng, Qi Ming Zhu, Fan Cao, Ping Li, and Nian Yu Zou. "A Study on Turbo Codes and Rake Received Mixed Algorithm in Multipath Fading Environment." Applied Mechanics and Materials 321-324 (June 2013): 2877–82. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.2877.

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In this paper, a Turbo codes and Rake received mixed algorithm in multipath fading environment is proposed to solve the problems in signal reception in a fading environment of the mobile communication system. Compared to the traditional multi-path reception methods, the advantage of the algorithm can significantly improve system performance; reduce the system error rate by approximately 2.5dB. Moreover, the performance of the system will be improved a lot if the antenna power is equal. Firstly a mixed algorithm in AWGN channel and multipath fading channel is introduced and derived theoreticall

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ROSYID, FIGA AGHANI, SOLICHAH LARASATI, and WAHYU PAMUNGKAS. "Teknik Pengiriman File Audio Berbasis Software Defined Radio pada Kanal Komunikasi dalam Ruangan dengan Multicarrier OFDM." ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika 12, no. 4 (2024): 907. https://doi.org/10.26760/elkomika.v12i4.908.

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ABSTRAKTransmisi audio pada kanal indoor dipengaruhi oleh efek multipath fading yang dapat mengganggu kualitas sinyal. Multicarrier OFDM digunakan sebagai solusi untuk mengatasi fenomena ini. Penelitian ini mengkaji tentang karakteristik kanal indoor dan transmisi audio dengan multicarrier OFDM berbasis SDR. Simulasi menggunakan NI-USRP2920, RTL2832U, GNU Radio dan Matlab pada kondisi NLOS dan LOS. Analisa kanal berdasarkan parameter CCDF menunjukkan daya sinyal maksimum pada kondisi NLOS (0,535 dB) lebih rendah dibandingkan LOS (1,214 dB), menandakan multipath fading yang lebih signifikan. Tr

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Njemčević, Pamela, Adriana Lipovac, and Vlatko Lipovac. "Improved Model for Estimation of Spatial Averaging Path Length." Wireless Communications and Mobile Computing 2018 (July 12, 2018): 1–13. http://dx.doi.org/10.1155/2018/4704218.

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In mobile communication systems, the transmitted RF signal is subject to mutually independent deterministic path loss and stochastic multipath and shadow fading. As at each spatial location mostly the composite signal samples are measured, their components are distinguished by averaging out the multipath-caused signal level variations, while preserving just the ones due to shadowing. The prerequisite for this is the appropriateness of the local area averaging path length that enables obtaining the local mean (composed of mean path loss and shadow fading) and the multipath fading as difference

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Yu, Xiao Lei, Yin Shan Yu, Yu Yu Ji, and Dong Hua Wang. "Communication Performance of RFID System and Anti-Interference in the Multipath Rayleigh Fading Channel." Applied Mechanics and Materials 239-240 (December 2012): 1022–26. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.1022.

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With the communication environment of RFID system developing from near field communication to long distance communication, Rayleigh fading with Doppler frequency shift emerges from multipath effect between the readers and electronic tags. A systemic study was focused on modeling and analysis of channel transmission for Type A tag signals in the multipath Rayleigh fading channel. Furthermore, the OFDM system was added to the RFID tag signals to improve the sensitivity of SNR in the Rayleigh fading channel. The SNR of tag signal is not sensitive in the multipath Rayleigh fading channel. However,

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Widi Adnyana, Komang Gede, Nyoman Pramaita, and I. Made Oka Widyantara. "UNJUK KERJA KODE ORTHOGONAL M-SEQUENCE DALAM SISTEM DIRECT SEQUENCE SPREAD SPECTRUM MELALUI KANAL MULTIPATH FA." Jurnal SPEKTRUM 9, no. 4 (2022): 1. http://dx.doi.org/10.24843/spektrum.2022.v09.i04.p1.

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Multipath and multi-user interference are the main challenges in wireless communication systems. This has become a driving force for the development of data transmission technology that is focused to overcome these problems, one of which is spread spectrum. Spread spectrum is applied to CDMA technology which has the limitations of MAI, so a spreading code is required with specifications that have a very low cross-correlation value as in the orthogonal m-sequence code. In this study, simulate the orthogonal m-sequence code with a length of 8 chips on a multipath fading channel using the Direct

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Mohammed, Hasan Fadhil, and Ghanim Abdulkareem Mughir. "Performance evaluation of 4-quadrature amplitude modulation over orthogonal frequency division multiplexing system in different fading channels scenarios." International Journal of Electrical and Computer Engineering (IJECE) 12, no. 5 (2022): 5123. http://dx.doi.org/10.11591/ijece.v12i5.pp5123-5135.

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<p>Orthogonal frequency division multiplexing (OFDM) is a multicarrier modulation (MCM) technique that divides the wide bandwidth into parallel narrow bands, each of which is modulated by orthogonal subcarriers. Currently, OFDM is a high-spectral efficiency modulation technique that is used in a variety of wired and wireless applications. The transmitted signal in a wireless communication channel spreads from transmitter to receiver through multiple reflective paths. This triggers multipath fading, which causes variations in the received signal's amplitude and phase. Slow/fast and freque

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Hasan, Fadhil Mohammed, and Abdulkareem Mughir Ghanim. "Performance evaluation of 4-quadrature amplitude modulation over orthogonal frequency division multiplexing system in different fading channels scenarios." International Journal of Electrical and Computer Engineering (IJECE) 12, no. 5 (2022): 5123–35. https://doi.org/10.11591/ijece.v12i5.pp5123-5135.

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Orthogonal frequency division multiplexing (OFDM) is a multicarrier modulation (MCM) technique that divides the wide bandwidth into parallel narrow bands, each of which is modulated by orthogonal subcarriers. Currently, OFDM is a high-spectral efficiency modulation technique that is used in a variety of wired and wireless applications. The transmitted signal in a wireless communication channel spreads from transmitter to receiver through multiple reflective paths. This triggers multipath fading, which causes variations in the received signal's amplitude and phase. Slow/fast and frequency-s

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Adi Wiguna Sanjaya, I. Kadek, Nyoman Pramaita, and I. Made Oka Widyantara. "DESAIN SIMULASI UNJUK KERJA KODE SMALL KASAMI PADA KANAL MULTIPATH FADING." Jurnal SPEKTRUM 8, no. 3 (2021): 29. http://dx.doi.org/10.24843/spektrum.2021.v08.i03.p4.

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Telecommunication capable of handling interference, fading and no less importantissues regarding the confidentiality of user information is very much needed in the currenttechnological era, to overcome this spread spectrum technology is quite developed in theadvancement of telecommunication technology. In this study, the small kasami code was usedas the spreading code. The purpose of this study is to determine the performance of the smallkasami code with changes in the number of multipath components using multipath fadingchannels. The modulation technique uses digital modulation, namely binary

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Samosir, Pebri Yeni, Nyoman Pramaita, I. Gst A. Komang Diafari Djuni Hartawan, and Ni Made Ary Esta Dewi Wirastuti. "Performance Analysis of MIMO STBC System in Flat Fading and Frequency Selective Fading Channels." Journal of Electrical, Electronics and Informatics 3, no. 1 (2019): 19. http://dx.doi.org/10.24843/jeei.2019.v03.i01.p04.

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Multiple Input Multiple Output (MIMO) technology is a technique that can be used to overcome multipath fading. The multipath fading is caused by signals coming from several paths that experience different attenuations, delays and phases. In a multipath condition, an impulse that sent by the transmitter, will be received by the recipient not as an impulse but as a pulse with a spread width that called delay spread. Delay spread can cause intersymbol interference (ISI) and bit translation errors from the information received. To determine the effect of delay spread on the MIMO system, then MIMO

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Wu, Guilu, Fan Li, and Huilin Jiang. "Analysis of Multipath Fading and Doppler Effect with Multiple Reconfigurable Intelligent Surfaces in Mobile Wireless Networks." Wireless Communications and Mobile Computing 2022 (January 17, 2022): 1–15. http://dx.doi.org/10.1155/2022/5751316.

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The multipath fading and Doppler effect are well-known phenomena affecting channel quality in mobile wireless communication systems. Within this context, the emergence of reconfigurable intelligence surfaces (RISs) brings a chance to achieve this goal. RISs as a potential solution are considered to be proposed in sixth generation (6G). The core idea of RISs is to change the channel characteristic from uncontrollable to controllable. This is reflected by some novel functionalities with wave absorption and abnormal reflection. In this paper, the multipath fading and Doppler effect are characteri

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Marjanović, Zvezdan, Dejan N. Milić, and Goran T. Đorđević. "On Numerical Evaluation of Packet-Error Rate for Binary Phase-Modulated Signals Reception over Generalized-K Fading Channels." Facta Universitatis, Series: Mathematics and Informatics 33, no. 2 (2018): 203. http://dx.doi.org/10.22190/fumi1802203m.

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We present a numerical evaluation of packet error rate (PER) for digital binary phase modulations over wireless communication channels. The analysis is valid for a quasistatic fading communication channel, where multipath fading and shadowing appear simultaneously. The approach is based on numerical evaluation of signal-to-noise ratio threshold that is further used in PER computation. We analyze the threshold and PER dependence on signal power, multipath fading and shadowing severity, as well as packet length.

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XIA, YONGXIANG, CHI K. TSE, FRANCIS C. M. LAU, and GÉZA KOLUMBÁN. "PERFORMANCE OF FREQUENCY-MODULATED DIFFERENTIAL-CHAOS-SHIFT-KEYING COMMUNICATION SYSTEM OVER MULTIPATH FADING CHANNELS WITH DELAY SPREAD." International Journal of Bifurcation and Chaos 15, no. 12 (2005): 4027–33. http://dx.doi.org/10.1142/s0218127405014465.

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Multipath performance is an important consideration for chaos-based communication systems. In this letter, the performance of the FM-DCSK communication system over multipath fading channels is evaluated by computer simulations. Both Rayleigh fading and Ricean fading are considered, and the low-pass equivalent model of the FM-DCSK system is used in the simulation. Based on this model, we analyze the bit error performance of the system and the effects of system parameters on the bit-error performance.

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Ng, Benjamin K., and Chan-Tong Lam. "Single-Carrier Rotation-Interleaved Space-Time Code for Frequency-Selective Fading Channels." Applied Sciences 12, no. 24 (2022): 12803. http://dx.doi.org/10.3390/app122412803.

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A novel single-carrier-based space-time code construction scheme to exploit the advantages of a frequency-selective fading channel is investigated in this paper. The proposed construction scheme is based on multiplexing independent streams of phase-rotated space-time codes in a time-interleaved fashion. The advantage of such design is that it guarantees full space-time-multipath diversity by using traditional space-time codes or MIMO signaling schemes originally designed for flat fading channels as the constituent codes. Another advantage is that this approach incurs no loss in bandwidth effic

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M. Abd Elaziz, Nadir. "Radar Echo Signal Multipath Fading." IOSR Journal of Engineering 04, no. 12 (2014): 61–066. http://dx.doi.org/10.9790/3021-0412261066.

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Keshvadi, Hatef, Ali Broumandan, and Gérard Lachapelle. "Spatial Characterization of GNSS Multipath Channels." International Journal of Antennas and Propagation 2012 (2012): 1–15. http://dx.doi.org/10.1155/2012/236464.

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There is a growing interest in detecting and processing Global Navigation Satellite System (GNSS) signals in indoors and urban canyons by handheld devices. To overcome the signal attenuation problem in such adverse fading environments, long coherent integration is normally used. Moving the antenna arbitrarily while collecting signals is generally avoided as it temporally decorrelates the signals and limits the coherent integration gain. This decorrelation is a function of the antenna displacement and geometry of reflectors and angle of arrival of the received signal. Hence, to have an optimum

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Chen, Liang-wei. "Network Service Method under Cloud Environment of Wireless Sensor Networks in Disaster Situation." International Journal of Online Engineering (iJOE) 12, no. 11 (2016): 16. http://dx.doi.org/10.3991/ijoe.v12i11.6231.

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The sensor networks are characterized by tiny, inexpensive, and advanced communication technology. However, wireless ad-hoc sensor networks (WASNs) have some issues such as the limited amount of energy, multipath fading, and some other issues when they applied in disaster situations. For reducing power consumption, we show mathematical analysis of energy saving, and enhanced error symbol probability. The simulation results prove our analysis. As for the multipath fading, we also show the mathematical analysis of fading channel characteristics and channel model, as well as how to mitigate the m

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Widi Arjana Yasa, I. Ketut, Nyoman Pramaita, and Ni Made Ary Esta Dewi Wirastuti. "DESAIN PROGRAM SIMULASI UNJUK KERJA KODE LARGE KASAMI PADA SISTEM KOMUNIKASI DIRECT SQUENCE SPREAD SPECTRUM MELALUI KANAL MULTIPATH FADING." Jurnal SPEKTRUM 8, no. 3 (2021): 51. http://dx.doi.org/10.24843/spektrum.2021.v08.i03.p7.

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Selection of Pseudo Noise (PN) code in CDMA multiple access is needed to overcomeproblems related to interference. In this study, we simulate the large kasami code with the aimof knowing the performance of the large kasami code on flat fading channels and frequencyselective fading channels with variations in the number of multipath components. The receiversystem uses a correlation receiver to correlate the code used by each user. The simulationresults from the performance of the large kasami code through the flat fading channel show thatthe simulation carried out is valid, where the simulation

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She, Feng, Hsiao Hwa Chen, and Hongyang Li. "Joint Angular and Time Diversity of Multi-Antenna CDMA Systems in Wireless Fading Channels." International Journal of Wireless Networks and Broadband Technologies 1, no. 1 (2011): 1–14. http://dx.doi.org/10.4018/ijwnbt.2011010101.

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In this paper, a multi-antenna based receiver structure for direct sequence code division multiple access (DS/CDMA) system is proposed. The proposed scheme exploits the excellent time resolution of a CDMA RAKE receiver and uses an antenna array beamforming structure to resolve multipath returns in both angular and time domains. A much higher diversity gain than that based only on the time domain diversity can be achieved. This work suggests a new space-time diversity paradigm, namely angular-time diversity, which differs from traditional Alamouti-type space-time coded schemes. The impairments

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Allanki Sanyasi Rao and Kallepelli Srikanth, Karthik Kumar Vaigandla,. "Study of Modulation Schemes over a Multipath Fading Channels." International Journal for Modern Trends in Science and Technology 7, no. 10 (2021): 34–39. http://dx.doi.org/10.46501/ijmtst0710005.

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Communications systems concerted over wireless channels depend on the environment. Communications system can be more reliable and efficient by properly analyzing wireless channels. Today's most important features are a high data rate and reliable performance to exploiting viable networks during this new information age. The channel is not time-invariant in wireless communication, so the received signal exhibits amplitude, phase, and angle variations due to multipath fading. Increasing data rates and reducing bandwidth make Orthogonal Frequency Division Multiplexing (OFDM) an important componen

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Abid, Zainab Majeed. "Performance of Different Concatenated Coding Schemes for CDMA System." Journal of Engineering 24, no. 12 (2018): 60–72. http://dx.doi.org/10.31026/j.eng.2018.12.06.

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In this paper different channel coding and interleaving schemes in DS/CDMA system over multipath fading channel were used. Two types of serially concatenated coding were presented. The first one composed of Reed-Solomon as outer code, convolutional code as inner code and the interleaver between the outer and inner codes and the second consist of convolutional code as outer code, interleaved in the middle and differential code as an inner code. Bit error rate performance of different schemes in multipath fading channel was analyzed and compared. Rack receiver was used in DS/CDMA receiver to com

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BAI, ZHIQUAN, YUANQUAN XU, XIAOTONG LI, RONGKAI LI, DONGFENG YUAN, and KYUNGSUP KWAK. "MIMO DS-BPAM UWB SYSTEM WITH SRAKE RECEIVER OVER MULTIPATH FADING CHANNELS." Journal of Circuits, Systems and Computers 18, no. 06 (2009): 1075–80. http://dx.doi.org/10.1142/s021812660900554x.

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In this paper, we investigate the multiple input multiple output (MIMO) direct sequence bipolar pulse amplitude modulation (DS-BPAM) ultra wideband (UWB) system over indoor multipath fading channels based on the research of Alamouti space-time block codes (STBC) and DS-BPAM UWB system. Selective Rake (SRake) receiver is employed in this paper in order to deal with the multipath effects. Theoretical bit error probability of the MIMO DS-BPAM UWB system with SRake receiver is derived. Simulation results of the MIMO DS-BPAM UWB system with SRake receiver and conventional coherent receiver over mul

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Kumar, Sushil, and D. K. Lobiyal. "Sensing Coverage Prediction for Wireless Sensor Networks in Shadowed and Multipath Environment." Scientific World Journal 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/565419.

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Sensing coverage problem in wireless sensor networks is a measure of quality of service (QoS). Coverage refers to how well a sensing field is monitored or tracked by the sensors. Aim of the paper is to have a priori estimate for number of sensors to be deployed in a harsh environment to achieve desired coverage. We have proposed a new sensing channel model that considers combined impact of shadowing fading and multipath effects. A mathematical model for calculating coverage probability in the presence of multipath fading combined with shadowing is derived based on received signal strength (RSS

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Mudhoep, Debbi Irfan, Rukmi Sari Hartati, and Yoga Divayana. "Peningkatan Unjuk Kerja Pada Link Microwave Menggunakan Teknik Diversity Maximal Ratio Combining." Majalah Ilmiah Teknologi Elektro 19, no. 2 (2020): 127. http://dx.doi.org/10.24843/mite.2020.v19i02.p01.

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Pada system komunikasi menggunakan gelombang microwave ( link microwave ), adanya noise serta multipath fading dapat mengurangi dan menurunkan kinerja system komunikasi. Perambatan gelombang mikro dipengaruhi beberapa hal pada system penerimaan selain harus LOS ( Line Of Sight ) terdapat sinyal pantulan dari permukaan yang sangat menimbulkan interferensi ( sinyal multipath ). Dengan menggunakan teknik diversity maximal ratio combining pada system yang terkena noise dan fading digunakan melalui analisa BER ( Bit Error Rate ). Penggunaan simulasi penelitian untuk mengetahui perbaikan system di p

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Medard, M., and R. G. Gallager. "Bandwidth scaling for fading multipath channels." IEEE Transactions on Information Theory 48, no. 4 (2002): 840–52. http://dx.doi.org/10.1109/18.992769.

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Yousef, Nabil R., Ali H. Sayed, and Nima Khajehnouri. "Detection of fading overlapping multipath components." Signal Processing 86, no. 9 (2006): 2407–25. http://dx.doi.org/10.1016/j.sigpro.2005.11.002.

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Chang Heon Lim and Jae Kwon Jeong. "Adaptive modulation using multipath fading compensation." Electronics Letters 34, no. 10 (1998): 940. http://dx.doi.org/10.1049/el:19980653.

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Fokin, G. "Modeling multi-beam radio channel." Telecom IT 9, no. 1 (2021): 59–78. http://dx.doi.org/10.31854/2307-1303-2021-9-1-59-78.

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In this work, a simulation model of a radio channel with fading is implemented for use  in research of the multipath channel, as well as for assessing the noise immunity of transmission, recep-tion and processing systems in modern and future mobile communication and radio access networks. Formalization of mathematical models of a radio channel with fading, including the Rayleigh amplitude distribution, uniform phase distribution and a given Doppler spectrum, made it possible to visualize  the time-frequency and probabilistic characteristics of a radio channel with fading. The imple

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F. Mohammed, Hassan, and Ghanim A. Al-Rubaye. "BER PERFORMANCE ANALYSIS OF 4QAM/OFDM OVER DIFFERENT SCENARIOS OF LAPLACE FADING CHANNEL." Journal of Engineering and Sustainable Development 25, Special (2021): 1–26. http://dx.doi.org/10.31272/jeasd.conf.2.1.4.

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Multicarrier transmission, also known as (OFDM) Orthogonal Frequency Division multiplexing, in wireless communications, it has been proven to be an essential technique for countering multipath fading. It has been used successfully for HF radio applications and has been selected as the interface for digital audio transmission, digital terrestrial TV broadcasting, and high-speed wireless local area networks in Europe. In this paper, we suggested a new design for modeling multipath fading channels, such as the Laplace fading channel, in order to discover new simulation results and effects. Furthe

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Kurnia, Mohammad Andri, Eka Wahyudi, and Solichah Larasati. "Comparison of Hybrid Diversity and Space Diversity for Microwave Link Between Islands." CESS (Journal of Computer Engineering, System and Science) 5, no. 2 (2020): 285. http://dx.doi.org/10.24114/cess.v5i2.18160.

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The development of telecommunications technology today, so that some islands are still not affordable from telecommunications technology. The considerable distance between islands requires the efficiency and flexibility of the technology used. The microwave communication system is a technology that is widely implemented as a cellular network backhaul network because it has advantages in the simplicity of installation and can reach remote areas that are difficult to reach. But on the receiving side, the signal received not only comes from the LOS (Line of Sight) signal but the signal is also re

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Manhas, Pratima, and M. K. Soni. "Performance of OFDM System under Different Fading Channels and Channel Coding." Bulletin of Electrical Engineering and Informatics 6, no. 1 (2017): 54–61. http://dx.doi.org/10.11591/eei.v6i1.591.

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Orthogonal frequency division multiplexing (OFDM) is a type of multicarrier modulation (MCM) technique in which larger bandwidth is divided into parallel narrow bands each of which is modulated by different subcarriers. All the subcarriers are orthogonal to each other and hence it reduces the interference among various subcarriers. OFDM technique is an efficient modulation technique used in certain wired and wireless application.In a wireless communication channel, the transmitted signal can travel from transmitter to receiver over multiple reflective paths. This results to multipath fading wh

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Pratima, Manhasa, and K. Sonib M. "Performance of OFDM System under Different Fading Channels and Coding." Bulletin of Electrical Engineering and Informatics 6, no. 1 (2017): 54–61. https://doi.org/10.11591/eei.v6i1.591.

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Orthogonal frequency division multiplexing (OFDM) is a type of multicarrier modulation (MCM) technique in which larger bandwidth is divided into parallel narrow bands each of which is modulated by different subcarriers. All the subcarriers are orthogonal to each other and hence it reduces the interference among various subcarriers. OFDM technique is an efficient modulation technique used in certain wired and wireless application.In a wireless communication channel, the transmitted signal can travel from transmitter to receiver over multiple reflective paths. This results to multipath fading wh

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Sadrieh, Seyed Nima, Ali Broumandan, and Gérard Lachapelle. "Doppler Characterization of a Mobile GNSS Receiver in Multipath Fading Channels." Journal of Navigation 65, no. 3 (2012): 477–94. http://dx.doi.org/10.1017/s037346331200015x.

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Global Navigation Satellite Systems (GNSS) Doppler measurements are commonly used for velocity-based relative positioning and aiding Inertial Navigation Systems (INS) in signal degraded environments. The aim of this paper is to characterise the Doppler measurements in GNSS harsh multipath environments. In multipath fading situations such as indoor and urban canyon environments, multipath components arrive to the receiver antenna from different paths and directions. These give rise to various Doppler shifts that cause errors in the velocity solution. In this work the Doppler measurements discre

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Nguyen, Tien Manh, Seung‐Ho Kim, and Jae‐Young Chung. "Characterization of multiple‐input‐multiple‐output antennas under different multipath environments in a reverberation chamber." Microwave and Optical Technology Letters 60, no. 10 (2018): 2437–42. http://dx.doi.org/10.1002/mop.31388.

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AbstractMultiple‐input‐multiple‐output (MIMO) antennas with different envelope correlation coefficients (ECCs) were designed and characterized in a reverberation chamber (RC) under different fading channels: urban macro, urban micro, and Rayleigh. The generation of different multipath environments and the procedures to estimate MIMO antenna figures of merit are described in detail. The experiment results show the MIMO antenna radiation efficiency remains unchanged as the multipath environment changes. In contrast to the radiation efficiency, ECC has discrepancies between the fading channels, i

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Tu, Pingzhou. "Performance of an Interleaved Spread Spectrum OFDM System over Multipath Fading Channels." ECTI Transactions on Electrical Engineering, Electronics, and Communications 7, no. 1 (2007): 1–13. http://dx.doi.org/10.37936/ecti-eec.200971.171797.

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In this paper we propose an interleaved spread spectrum orthogonal frequency division multiplexing (ISS-OFDM) system and investigate its performance over frequency selective multipath fading channels. The purpose is to exploit frequency diversity capability, develop an e±cient spectrum spreading algorithm and improve the system performance over frequency selective multipath fading channels. At transmitter, a spectrum spread ISS-OFDM signal is generated by employing OFDM modulation and interleaving techniques. At the receiver, two solutions including serial demodulation and parallel demodulatio

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Ye, Zhengmao. "Exploring Impact of Doppler Effect on Time-Varying Multipath Wireless Communication Channels via Model Based Characteristic Analysis." WSEAS TRANSACTIONS ON SIGNAL PROCESSING 20 (December 31, 2024): 145–52. https://doi.org/10.37394/232014.2024.20.15.

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In areas of outdoor wireless communication, the Doppler shift occurs due to the relative motion between the transmitter and receiver. To apply any baseband channel model for multipath propagation, some real-world phenomena must be taken into account, such as the Doppler effect, time dispersion, and multipath scattering. Time dispersion of the radio channel leads to the Intersymbol Interference (ISI) which degrades communication performance. Scattering at diverse angles gives rise to a range of Doppler frequency shifts referred to as the Doppler spectrum. The maximum Doppler shift arises whenev

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Pradana, Zein Hanni, and Ade Wahyudin. "Analisis Optimasi Space Diversity pada Link Microwave Menggunakan ITU Models." Jurnal Elektro dan Telekomunikasi Terapan 4, no. 2 (2018): 586. http://dx.doi.org/10.25124/jett.v4i2.1148.

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Dalam sebuah Link Microwave, sinyal terima harus memenuhi syarat LOS (Line of Sight). LOS adalah perambatan radio gelombang mikro dari antena pengirim ke antena penerima dengan jalur transmisi bebas. Pada penerima, sinyal yang diterima tidak hanya berasal dari sinyal LOS tetapi sinyal yang dipantulkan dari permukaan bumi. Sinyal dari beberapa pantulan ini sering disebut dengan multipath. Penerimaan sinyal di penerima memang merupakan sinyal penambahan dari sinyal LOS dan juga sinyal multipath, namun sinyal-sinyal multipath ini justru akan menimbulkan interferensi yang dapat menyebabkan fading

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Dio Gangga Saskara, I. Putu, Nyoman Pramaita, and I. Gusti Agung Komang Diafari Djuni H. "DESAIN SIMULASI UNJUK KERJA BARKER CODE PADA KANAL FREQUENCY SELECTIVE FADING." Jurnal SPEKTRUM 9, no. 3 (2022): 8. http://dx.doi.org/10.24843/spektrum.2022.v09.i03.p2.

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The signal that arrives at the receiving end is the sum of the various transmissions passed by the signal (multipath) which is influenced by the channel so that there is signal interference. Many innovations have been made so that the received signal can have high security, one of which is spread spectrum with a dual access scheme to increase the ability of many spectrum users in a limited number without disturbing one another. This simulation was tested with the aim of spreading the spectrum with different code lengths for the same bit length of information, and observed from the change in th

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Wu, Ya Ting, Yan Zan Sun, and Xi Luo. "Delay-Locked Loop for Pseudorange Measurement over Frequency-Selective Fading Channels." Applied Mechanics and Materials 303-306 (February 2013): 2050–53. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.2050.

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A delay-locked loop is proposed for accurate code tracking over frequency-selective fading channels in this paper. Taking advantage of the shift-and-add property of maximum length pseudorandom spread-spectrum sequences, the differential multiplier is employed to separate each multipath component and reduce the effects of other multipath signals. The contribution of all the multipath signals is combined to enhance the error characteristic. Simulation results verify the performance improvement of the proposed loop.

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Alabi, Oluwaseun Yinka, and Michael Kolawole. "Mitigating the Effects of Intereference in a Multipath Prone Environment for a DVB-T Transmission." International Journal of Informatics and Communication Technology (IJ-ICT) 4, no. 2 (2015): 86. http://dx.doi.org/10.11591/ijict.v4i2.pp86-89.

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This paper develops a novel simulation method that seeks to mitigate the effects of interference in a multipath prone environment for a DVB-T transmission by using the AWGN and the Multipath Rayleigh Fading Channel. The channel parameters were optimized until desired result was obtained. The reception performance of the DVB-T system shows that interference though not totally eliminated, can be minimized while transmitting in a multipath prone environment.

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Aguodoh, Patrick C., and Hyacinth A. Chineke. "Enhancing the Channel Capacity of a Cellular Mobile System using Frequency Diversity." International Journal of Trend in Scientific Research and Development 2, no. 1 (2017): 424–32. https://doi.org/10.31142/ijtsrd7015.

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Communication industries have been encountering a lot of problems in their communication links some of such difficulties or problems are Interference, fading, overhanging, attenuation and congestion. Transmitted signals with different frequencies are affected in different ways in frequency domain. The fact is an advantage in frequency diversity technique. Multiple replicas of information signal are sent over several affected frequency band in this diversity. In a sufficient wide signal bandwidth, multipath components can resolve. This paper presents the technique that can enhance the channel c

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Zainul Halim, Muhamad, Nyoman Pramaita, and Pande Ketut Sudiarta. "SIMULASI KINERJA GOLD CODE PADA SISTEM KOMUNIKASI DIRECT SEQUENCE SPREAD SPECTRUM (DSSS) MELALUI KANAL MULTIPATH FADING." Jurnal SPEKTRUM 8, no. 2 (2021): 257. http://dx.doi.org/10.24843/spektrum.2021.v08.i02.p29.

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The communication channel cannot be separated from noise, interference and fading.To minimize mutual interference, you can use a scatter code. This research uses Gold Codewith a code length of 31. This simulation aims to determine the effect of the number of multipathcomponents on the Gold Code performance of multipath fading channels. This simulation usesdigital modulation, namely BPSK (Binary Phase Shift Keying). In the simulation of flat fadingchannel with 1 multipath component number, the results of the comparison of simulated BERwith theoretical BER are almost the same so that the simulat

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Krstic, Dragana, Petar Nikolic, Danijela Aleksic, Sinisa Minic, Dragan Vuckovic, and Mihajlo Stefanovic. "Product of Three Random Variables and its Application in Relay Telecommunication Systems in the Presence of Multipath Fading." Journal of Telecommunications and Information Technology 1 (March 29, 2019): 83–92. http://dx.doi.org/10.26636/jtit.2019.130018.

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In this paper, the product of three random variables (RVs) will be considered. Distribution of the product of independent random variables is very important in many applied problems, including wireless relay telecommunication systems. A few of such products of three random variables are observed in this work: the level crossing rate (LCR) of the product of a Nakagami-m random variable, a Rician random variable and a Rayleigh random variable, and of the products of two Rician RVs and one Nakagami-m RV is calculated in closed forms and presented graphically. The LCR formula may be later used for

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Pedraza, Luis, Cesar Hernández, and Dora María Ballesteros. "Model of frequency selective fading." Revista Facultad de Ingeniería Universidad de Antioquia, no. 58 (February 27, 2013): 114–22. http://dx.doi.org/10.17533/udea.redin.14605.

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In this paper a mathematical analysis of the frequency selective fading produced by multipath propagation is presented, as well as recent techniques to reduce the effects of this phenomenon as: the diversity of antennas, the Rake receiver, the adaptive equalization and OFDM (Orthogonal frequency division multiplexing).

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Xia, Wenhe, Wenting Guan, Zujun Jiang, Yingfeng Meng, and Bo Tang. "Modeling and measurement of microwave propagation multipath channels in drill pipe bore." International Journal of Microwave and Wireless Technologies 11, no. 3 (2018): 220–26. http://dx.doi.org/10.1017/s1759078718001277.

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AbstractIn this paper, the characteristics of microwave propagation channels in drill pipe bore are analyzed by regarding the drill pipe as an irregular lossy cylindrical waveguide. An attenuation law is modeled using multipath propagation theory and an experimental statistical method. It is shown from physical measurement results that 5″ and $5^{1/2 \prime \prime} $ drill pipe bores, widely applied in the field of air drilling, can be used as 2.4 GHz band microwave channels with the caveat that the numerous reflective surfaces in the joint section of the drill pipe produce a great deal of ref

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Gvozdarev, Aleksey S., and Tatiana K. Artemova. "On the Physical Layer Security Peculiarities of Wireless Communications in the Presence of the Beaulieu-Xie Shadowed Fading." Mathematics 10, no. 20 (2022): 3724. http://dx.doi.org/10.3390/math10203724.

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The article presents an analysis of the physical layer security of a wireless communication system functioning in the presence of multipath fading and a wiretap. Under the assumption of the equal propagation conditions (both for the legitimate receiver and the eavesdropper) described by the shadowed Beaulieu–Xie model, a closed-form expression for the secrecy outage probability was derived. The correctness of the obtained expression was numerically verified via comparison with the direct numerical integration. The truncated version of the obtained expression was analyzed for various channel pa

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Asif, Muhammad, Abid Yahya, Othman Sidek, Farid Ghani, and Umair Soori. "Frequency Hopping Overcomes Multipath Fading using FEC." International Conference on Electrical Engineering 6, no. 6 (2008): 1–9. http://dx.doi.org/10.21608/iceeng.2008.34215.

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