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Artículos de revistas sobre el tema "Time-Frequency fading"

Autor: Grafiati
Publicado: 25 de mayo de 2024

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1

Zhiqiang Liu, Yan Xin, and G. B. Giannakis. "Space-time-frequency coded OFDM over frequency-selective fading channels." IEEE Transactions on Signal Processing 50, no. 10 (2002): 2465–76. http://dx.doi.org/10.1109/tsp.2002.803332.

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2

Hongbin Li. "Differential space-time-frequency modulation over frequency-selective fading channels." IEEE Communications Letters 7, no. 8 (2003): 349–51. http://dx.doi.org/10.1109/lcomm.2003.814711.

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3

ISHII, K. "Space-Time-Frequency Turbo Code over Time-Varying and Frequency-Selective Fading Channel." IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E88-A, no. 10 (2005): 2885–95. http://dx.doi.org/10.1093/ietfec/e88-a.10.2885.

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4

Chu, James. "Frequency-Selective and Time-Selective Fading [Book\/Software Reviews]." IEEE Microwave Magazine 19, no. 5 (2018): 87–103. http://dx.doi.org/10.1109/mmm.2018.2821089.

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5

TAO, X., C. ZHANG, J. LU, and N. SUEHIRO. "Adaptive CI-OSDM in Time-Frequency Selective Fading Channel." IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E91-A, no. 12 (2008): 3712–22. http://dx.doi.org/10.1093/ietfec/e91-a.12.3712.

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6

Borah, D. K., and B. D. Hart. "Receiver structures for time-varying frequency-selective fading channels." IEEE Journal on Selected Areas in Communications 17, no. 11 (1999): 1863–75. http://dx.doi.org/10.1109/49.806817.

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7

Al-nahari, A. Y., F. E. Abd El-Samie, and M. I. Dessouky. "Distributed Space-Time/Frequency Coding Schemes for Single-Carrier Frequency Division Multiple Access Systems." ISRN Communications and Networking 2011 (April 4, 2011): 1–10. http://dx.doi.org/10.5402/2011/549706.

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The single carrier-frequency division multiple access (SC-FDMA) system is a new system that was adopted in the standardization of the upcoming 3GPP long-term evolution (LTE). Designing diversity-achieving schemes for the SC-FDMA system is a challenging task. The codes adopted should not affect the peak-to-average power ratio (PAPR) among other constraints. In this paper, we consider the design of cooperative diversity schemes for SC-FDMA systems in the uplink direction. Specifically, two relay-assisted distributed space-time/frequency codes are proposed. The proposed distributed space-frequenc
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8

Sun, Zeng You, and Xia Ling. "Time-Varying Channel Multi-Carrier Modulation Technology Research." Applied Mechanics and Materials 513-517 (February 2014): 2680–86. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.2680.

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With frequency selective fading from multi-path characteristic and time selective fading from high speed mobility, double selective channel has become the typical context for the current wireless communication system. To realize high performance transmission in time-varying channel, this paper presents DAFT-OFDM multicarrier modulation scheme. The simulation results show that the scheme is applicable to time-varying fading channel, in which each path experiences independent Doppler spread. The scheme can also reduce ICI effectively.
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9

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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10

Kim, Minhyuk, and Sekchin Chang. "A real-time locating system for localization of high-speed mobile objects." International Journal of Distributed Sensor Networks 14, no. 5 (2018): 155014771877447. http://dx.doi.org/10.1177/1550147718774475.

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This article addresses a novel real-time locating system for localization of high-speed mobile objects in fading environments. The proposed locating system exploits time difference of arrival measurements based on ultra-wideband signals. However, the ultra-wideband signals cause a frequency-selective fading due to their short time duration, which induces severe inter-symbol interference. Moreover, high-speed objects cause fast fading due to large Doppler spread. Therefore, the fading cases considerably reduce the localization performance. The presented locating system relies on a new localizat
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11

Rainish, D., and J. M. Perl. "Generalized cutoff rate of time- and frequency-selective fading channels." IEEE Transactions on Communications 37, no. 5 (1989): 449–67. http://dx.doi.org/10.1109/26.24596.

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12

Tulino, Antonia M., Giuseppe Caire, Shlomo Shamai, and Sergio Verdu. "Capacity of Channels With Frequency-Selective and Time-Selective Fading." IEEE Transactions on Information Theory 56, no. 3 (2010): 1187–215. http://dx.doi.org/10.1109/tit.2009.2039041.

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13

Heider, Inaam Abbas. "Improvement of Fading Channel Modeling Performance for Wireless Channel." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 3 (2018): 1451. http://dx.doi.org/10.11591/ijece.v8i3.pp1451-1459.

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Fading channel modeling is generally defined as the variation of the attenuation of a signal with various variables. Time, geographical position, and radio frequency which is included. Fading is often modeled as a random process. Thus, a fading channel is a communication channel that experiences fading. In this paper, the proposed system presents a new design and simulate a wireless channel using Rayleigh channels. Rayleigh channels using two approaches (flat and frequency-selective fading channels) in order to calculate some path space loss efforts and analysis the performance of different wi
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14

Isaeva, E. A. "CONNECTION OF THE INTENSITY OF THE FLUX OF SCR PROTONS WITH THE VELOCITY OF THE CME AND WITH THE FADING OF THE RADIO EMISSION OF THE SUN IN THE DECAMETER RANGE." Odessa Astronomical Publications 34 (December 3, 2021): 76–80. http://dx.doi.org/10.18524/1810-4215.2021.34.244256.

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The relationship between SCR and CME and with fading of the continuum of noise storms and typeIV radio bursts in the decameter range is investigated. It was shown earlier that about 60% of CMEs associated with solar proton events are accompanied by deep fading of the solar radio emission in the decameter range, which coin-cides in time with CME registration. It has also been shown that fading is characterized by fading depth, the frequency bandwidth in which the fading occurs, as well as the duration of the fading and the frequency at which the maximum fading depth is observed. Further detaile
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15

Diki Andriasmika, I. Wayan, I. G. A. K. Diafari Djuni H, and N. M. A. E. Dewi Wirastuti. "ANALISIS INTERCARRIER INTERFERENCE (ICI) SISTEM OFDM-MIMO STBC PADA KANAL FREQUENCY SELECTIVE FADING." Jurnal SPEKTRUM 6, no. 1 (2019): 90. http://dx.doi.org/10.24843/spektrum.2019.v06.i01.p13.

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Wireless telecommunications requires high-speed access. One technique used tooWireless telecommunications requires high-speed access. One technique used toovercome multipath fading is Ortoghonal Frequency Division Multiplexing (OFDM). Theweakness of OFDM occurs on the mobile channel due to time variations in the channel, givingrise to intercarrier interference (ICI). The aim of the study is to determine the effect ofnormalized carrier frequency offset on ICI and the effect of frequency selective fading tapchannel. The simulation results show the system performance in calculating the Eb / N0 5
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16

Babich, Fulvio, Guido Montorsi, and Francesca Vatta. "Turbo Codes Performance Optimization over Block Fading Channels." Journal of Communications Software and Systems 2, no. 3 (2017): 228. http://dx.doi.org/10.24138/jcomss.v2i3.285.

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In this paper, the best achievable performance of a turbo coded system on a block fading channel is obtained, assuming binary antipodal modulation. A rate 1/3 turbo code is considered, obtained by concatenating, through a random interleaver, an 8-states rate 1/2 and a rate 1 convolutional codes (CC). The block fading channel model is motivated by the fact that in many wireless systems the coherence time of the channel is much longer than one symbol interval, resulting in adjacent symbols being affected by the same fading value. The fading blocks will experience independent fades, assuming a su
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17

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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18

Mheidat, Hakam, Murat Uysal, and Naofal Al-Dhahir. "Quasi-Orthogonal Time-Reversal Space–Time Block Coding for Frequency-Selective Fading Channels." IEEE Transactions on Signal Processing 55, no. 2 (2007): 772–78. http://dx.doi.org/10.1109/tsp.2006.885766.

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19

Liu, Ning, Zhengyuan Xu, and Brian M. Sadler. "Ziv–Zakai Time-Delay Estimation Bounds for Frequency-Hopping Waveforms Under Frequency-Selective Fading." IEEE Transactions on Signal Processing 58, no. 12 (2010): 6400–6406. http://dx.doi.org/10.1109/tsp.2010.2068547.

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20

Pashintsev, V. P., D. A. Belokon, S. A. Koval, and A. D. Skorik. "Methodology for Estimating Communication Reliability in Shortwave Radio-Frequency Transmission Channels with Rician Fading Given Ionospheric Diffusivity." Journal of the Russian Universities. Radioelectronics 25, no. 6 (2022): 22–39. http://dx.doi.org/10.32603/1993-8985-2022-25-6-22-39.

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Introduction. There exists a technique for estimating the dependence of communication reliability in a shortwave radio-frequency transmission channel (SWRC) with a single discrete beam and diffuse wave scattering across small-scale ionospheric inhomogeneities on the selected operating frequency taking into account the given signal-to-noise ratio and ionospheric diffusivity. In this technique, the Nakagami m-distribution is used to describe interference fading of the received signal. However, in a single-beam SWRC, fading signal amplitudes are described by the Rician or generalized Rayleigh, ra
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21

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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22

Tran, Le-Nam, Een-Kee Hong, and Huaping Liu. "A frequency domain equalization algorithm for fast time-varying fading channels." Journal of Communications and Networks 11, no. 5 (2009): 474–80. http://dx.doi.org/10.1109/jcn.2009.6388391.

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23

Wing Seng Leon and D. P. Taylor. "An adaptive receiver for the time- and frequency-selective fading channel." IEEE Transactions on Communications 45, no. 12 (1997): 1548–55. http://dx.doi.org/10.1109/26.650233.

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24

Zhiqiang Liu and G. B. Giannakis. "Space-time block-coded multiple access through frequency-selective fading channels." IEEE Transactions on Communications 49, no. 6 (2001): 1033–44. http://dx.doi.org/10.1109/26.930633.

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25

Rhee, D., H. G. Hwang, Y. J. Sang, and K. S. Kim. "Multiuser adaptive transmission technique for time-varying frequency-selective fading channels." Signal Processing 88, no. 8 (2008): 2095–107. http://dx.doi.org/10.1016/j.sigpro.2008.02.014.

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26

Li, Yong-zhao, Gui-sheng Liao, and Wen-ning Tong. "Space-time coded eigenbeamforming for downlink frequency-selective correlated fading channels." Journal of Shanghai University (English Edition) 10, no. 6 (2006): 500–505. http://dx.doi.org/10.1007/s11741-006-0046-1.

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27

Al-Rawi, Muhanned. "Study of Code Acquisition of FHSS System Over Rician Channel." Land Forces Academy Review 24, no. 1 (2019): 68–76. http://dx.doi.org/10.2478/raft-2019-0008.

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Abstract Frequency hopping is used in different communications systems for its robustness by providing frequency diversity against jamming and interfering signals. Successful detection and demodulation of a frequency hopping signal is dependent on proper tuning to transmit frequency and time synchronization of the burst. The sequence of hop frequencies is generally determined by a Pseudo-Noise (PN) sequence and time synchronization is achieved using synchronization preambles in the transmit burst. Successful acquisition of the hop frequency sequence could be achieved when at least a single bur
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28

Zheng, Jing, and Zulin Wang. "ICI Analysis for FRFT-OFDM Systems to Frequency Offset in Time-Frequency Selective Fading Channels." IEEE Communications Letters 14, no. 10 (2010): 888–90. http://dx.doi.org/10.1109/lcomm.2010.072910.100562.

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29

Tami, Abdelkader, Mokhtar Keche, and Boubaker S. Bouazza. "New OSTBC for Blind Channel Estimation and Tracking in MIMO-OFDM Systems." Journal of Telecommunications and Information Technology 3 (September 30, 2019): 49–57. http://dx.doi.org/10.26636/jtit.2019.133819.

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Applying orthogonal space time block coding (OSTBC) to multiple-input multiple-output (MIMO) systems helps reduce receiver complexity. However, this approach has been applied only to flat fading channels, as when the channel is a frequency selective fading MIMO channel, OSTBC cannot be used directly since its orthogonal propriety may be lost. Furthermore, the MIMO channel is not always known. To deal with this problem, many techniques were proposed to estimate the channel using a training sequence. Unfortunately, these techniques reduce the useful spectral bandwidth. This paper proposes OSTBC f
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30

Al-Qadi, Osama, Bertus Tazifua, and Evgeniy Semenov. "Analysis of Discrete Message Transmission in Orthogonal Frequency Division Multiplexing Systems." NBI Technologies, no. 4 (2022): 5–9. http://dx.doi.org/10.15688/nbit.jvolsu.2022.4.1.

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High data transfer rates are required in modern digital radio transmission systems. But an increase in the data transfer rate leads to a deterioration in the transmission quality and a high BER (bit error rate). OFDM technology, which was introduced in the 1960s, implements all these functions. In this paper, the influence of fading channels on the transmission of information in OFDM systems is investigated. In wireless systems for transmitting discrete messages, the channel parameters greatly affect the transmission quality, as interference, noise and fading affect the useful signal. Fading i
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31

Pan, P., L. L. Yang, and Y. Zhang. "Time-frequency iterative multiuser detection in time-frequency-domain spread multicarrier DS-CDMA systems over Nakagami-m fading channels." European Transactions on Telecommunications 22, no. 1 (2010): 2–13. http://dx.doi.org/10.1002/ett.1439.

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32

Shengli Zhou and G. B. Giannakis. "Single-carrier space-time block-coded transmissions over frequency-selective fading channels." IEEE Transactions on Information Theory 49, no. 1 (2003): 164–79. http://dx.doi.org/10.1109/tit.2002.806158.

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33

Jang, J., K. B. Lee, and Y. H. Lee. "Frequency-time domain transmit power adaptation for multicarrier system in fading channels." Electronics Letters 38, no. 5 (2002): 218. http://dx.doi.org/10.1049/el:20020166.

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34

Yeh, Hen-Geul, and Samet Yildiz. "Space–Time Trellis-Coded OFDM Systems in Frequency-Selective Mobile Fading Channels." IEEE Transactions on Circuits and Systems II: Express Briefs 64, no. 6 (2017): 660–64. http://dx.doi.org/10.1109/tcsii.2016.2598083.

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35

Cheng, C. C., and C. C. Lu. "Space–Time Code Design for CPFSK Modulation Over Frequency-Nonselective Fading Channels." IEEE Transactions on Communications 53, no. 9 (2005): 1477–89. http://dx.doi.org/10.1109/tcomm.2005.855006.

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36

LIU, HUAPING, VINOD VENKATESAN, MARIO E. MAGAÑA, CURT NILSEN, and RON KYKER. "PERFORMANCE OF FREQUENCY HOPPED NONCOHERENT GFSK OVER TIME-VARYING RAYLEIGH FADING CHANNELS." International Journal on Wireless & Optical Communications 02, no. 01 (2004): 51–61. http://dx.doi.org/10.1142/s0219799504000209.

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37

Yong Li and Jaekyun Moon. "Bit-interleaved space-time trellis coding for frequency selective block fading channels." IEEE Communications Letters 10, no. 1 (2006): 40–42. http://dx.doi.org/10.1109/lcomm.2006.1576563.

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38

LEE, H. "Iterative Sequential OFDM Symbol Estimation Algorithm over Time-Frequency-Selective Fading Channels." IEICE Transactions on Communications E89-B, no. 6 (2006): 1922–25. http://dx.doi.org/10.1093/ietcom/e89-b.6.1922.

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39

He, Jianqiang, Guoxiang Gu, and Zhongshan Wu. "MMSE Interference Suppression in MIMO Frequency Selective and Time-Varying Fading Channels." IEEE Transactions on Signal Processing 56, no. 8 (2008): 3638–51. http://dx.doi.org/10.1109/tsp.2008.919389.

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40

Borah, D. K., and B. D. Hart. "A robust receiver structure for time-varying, frequency-flat, Rayleigh fading channels." IEEE Transactions on Communications 47, no. 3 (1999): 360–64. http://dx.doi.org/10.1109/26.752815.

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41

Borah, D. K., and B. T. Hart. "Frequency-selective fading channel estimation with a polynomial time-varying channel model." IEEE Transactions on Communications 47, no. 6 (1999): 862–73. http://dx.doi.org/10.1109/26.771343.

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42

Qiu, Wenxun, Hlaing Minn, and Chia-Chin Chong. "An Efficient Diversity Exploitation in Multiuser Time-Varying Frequency-Selective Fading Channels." IEEE Transactions on Communications 59, no. 8 (2011): 2172–84. http://dx.doi.org/10.1109/tcomm.2011.060911.090439.

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43

Long, Yi, Linling Kuang, and Jianhua Lu. "Precoded OFDM system for ICI mitigation over time-frequency selective fading channels." Tsinghua Science and Technology 14, no. 2 (2009): 206–11. http://dx.doi.org/10.1016/s1007-0214(09)70031-8.

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44

Zhou, S., and G. B. Giannakis. "Space-time coding with maximum diversity gains over frequency-selective fading channels." IEEE Signal Processing Letters 8, no. 10 (2001): 269–72. http://dx.doi.org/10.1109/97.957268.

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45

Zhu, Jiangzhang, Shuangchun Wen, and Qingsong Du. "Space-frequency-Doppler coded OFDM over the time-varying Doppler fading channels." AEU - International Journal of Electronics and Communications 62, no. 4 (2008): 307–15. http://dx.doi.org/10.1016/j.aeue.2007.04.004.

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46

Stoica, Petre, and Girish Ganesan. "Trained Space-Time Block Decoding for Flat Fading Channels with Frequency Offsets." Wireless Personal Communications 27, no. 3 (2003): 235–45. http://dx.doi.org/10.1023/b:wire.0000010147.39594.2a.

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47

Kai-Kit Wong, R. D. Murch, and K. B. Letaief. "Optimizing time and space MIMO antenna system for frequency selective fading channels." IEEE Journal on Selected Areas in Communications 19, no. 7 (2001): 1395–407. http://dx.doi.org/10.1109/49.932706.

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48

Hatanaka, Masahide, Toru Homemoto, and Takao Onoye. "Architecture and Implementation of Fading Compensation for Dynamic Spectrum Access Wireless Communication Systems." VLSI Design 2013 (June 6, 2013): 1–9. http://dx.doi.org/10.1155/2013/967370.

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This paper proposes an efficient architecture and implementation of fading compensation dedicated to dynamic spectrum access (DSA) wireless communication. Since pilot subcarrier arrangements are adaptively determined in wireless communication systems with DSA, the proposed architecture employs piecewise linear interpolation to the channel response estimation for data subcarriers in order to increase the channel estimation accuracy. The fading compensation for an orthogonal frequency-division multiplexing (OFDM) symbol is performed within the time for one OFDM symbol to make increase of latency
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49

Teichmann, R., and L. Spillmann. "Fading of Textured Targets on Textured Background." Perception 26, no. 1_suppl (1997): 5. http://dx.doi.org/10.1068/v970094.

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In 1804 Troxler reported that with strict fixation, a small, low-contrast target presented to the peripheral visual field will tend to fade and ultimately become invisible. Further studies have shown that, in addition to stationary targets, moving and flickering targets will also fade. We studied the role of a texture difference between the target and its background on fading. We found that textured targets fade as quickly as, or even faster than, uniform targets. Typically, the target becomes less salient and after a while disappears in the background. Specifically, we asked whether orientati
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50

El Gamal, H., A. R. Hammons, Youjian Liu, M. P. Fitz, and O. Y. Takeshita. "On the design of space-time and space-frequency codes for MIMO frequency-selective fading channels." IEEE Transactions on Information Theory 49, no. 9 (2003): 2277–92. http://dx.doi.org/10.1109/tit.2003.815804.

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