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Journal articles on the topic 'Antennas (Electronics) Code division multiple access'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Jiménez-Pacheco, Alberto, Ángel Fernández-Herrero, and Javier Casajús-Quirós. "Design and Implementation of a Hardware Module for MIMO Decoding in a 4G Wireless Receiver." VLSI Design 2008 (January 31, 2008): 1–8. http://dx.doi.org/10.1155/2008/312614.

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Future 4th Generation (4G) wireless multiuser communication systems will have to provide advanced multimedia services to an increasing number of users, making good use of the scarce spectrum resources. Thus, 4G system design should pursue both higher-transmission bit rates and higher spectral efficiencies. To achieve this goal, multiple antenna systems are called to play a crucial role. In this contribution we address the implementation in FPGAs of a multiple-input multiple-output (MIMO) decoder embedded in a prototype of a 4G mobile receiver. This MIMO decoder is part of a multicarrier code-d

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2

Paul, Rajarshi, Luke Sankey, Luca Corradini, Zoya Popovic, and Dragan Maksimovic. "Power Management of Wideband Code Division Multiple Access RF Power Amplifiers With Antenna Mismatch." IEEE Transactions on Power Electronics 25, no. 4 (2010): 981–91. http://dx.doi.org/10.1109/tpel.2009.2036355.

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3

Shukla, Aasheesh, Vishal Goyal, Manish Kumar, Munesh Chandra Trivedi, and Vinay Kumar Deolia. "MMSE based beamformer in massive MIMO-IDMA downlink systems." Journal of Electrical Engineering 71, no. 1 (2020): 65–68. http://dx.doi.org/10.2478/jee-2020-0010.

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AbstractNow-a-days Massive MIMO (mMIMO) become an attractive technology due to its spectral and energy efficiency by the means of simple signal processing. However, in overloaded scenario, wherein the number of users equipments (UEs) are larger than number of antennas, the spectral effciency (SE) suffers and hence error rate performance, it has been shown recently that use of code domain NOMA in mMIMO can improve the SE performance. Further, interleave division multiple access (IDMA) has been drawn much attention as a suitable code domain non-orthogonal multiple access (NOMA) for future commun

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4

Lee, Jeong-An, Seung-Bok Byun, Jong-Hyuk Lim, and Tae-Yeoul Yun. "Reconfigurable antenna for wideband code division multiple access and Korean satellite digital multimedia broadcasting controlled by pin-diodes." Microwave and Optical Technology Letters 49, no. 6 (2007): 1334–37. http://dx.doi.org/10.1002/mop.22413.

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5

Shukla, Aasheesh. "Joint RSMA and IDMA-Based NOMA system for downlink Communication in 5G and Beyond Networks." Journal of communications software and systems 16, no. 4 (2020): 324–29. http://dx.doi.org/10.24138/jcomss.v16i4.1035.

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Future communication networks may encounter various issues in order to facilitate heavy heterogeneous data traffic and large number of users, therefore more advanced multiple access (MA) schemes is required to meet the changing requirements. Recently, a promising physical-layer MA technique has been suggested for multi-antenna broadcast channels, namely Rate Splitting Multiple Access (RSMA). This new scheme has the ability to partially decode the interference and partially treat the remaining interference as noise which makes it to cope with wide range of user deployments and network loads. On

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6

Yegnanarayanan, S., P. D. Trinh, and B. Jalali. "Recirculating photonic filter: a wavelength-selective time delay for phased-array antennas and wavelength code-division multiple access." Optics Letters 21, no. 10 (1996): 740. http://dx.doi.org/10.1364/ol.21.000740.

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7

Lee, Hongmin, and Jinwon Park. "Isolation Improvement of a Microstrip Patch Array Antenna for WCDMA Indoor Repeater Applications." International Journal of Antennas and Propagation 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/264618.

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This paper presents the isolation improvement techniques of a microstrip patch array antenna for the indoor wideband code division multiple access (WCDMA) repeater applications. One approach is to construct the single-feed switchable feed network structure with an MS/NRI coupled-line coupler in order to reduce the mutual coupling level between antennas. Another approach is to insert the soft surface unit cells near the edges of the microstrip patch elements in order to reduce backward radiation waves. In order to further improve the isolation level, the server antenna and donor antenna are ins

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8

Hwang, Yu Min, Eun Cheol Kim, and Jin Young Kim. "Performance Analysis of PN Code Acquisition with MIMO Scheme for an UWB TH/CDMA System." Wireless Communications and Mobile Computing 2018 (October 18, 2018): 1–11. http://dx.doi.org/10.1155/2018/2835741.

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This paper presents performance and its simulation results of pseudonoise (PN) code acquisition scheme with MIMO scheme for an ultra-wideband time-hopping/code-division-multiple-access (UWB TH/CDMA) system. The transmission channel is modelled as a frequency selective lognormal fading channel. In almost practical PN code acquisition system, the existence of more than two synchronous cells in the uncertainty region of the search process is possible due to multipath effect. Therefore, based on deriving the detection probability, false alarm rate, miss detection probability, and mean acquisition

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9

Yang, Jie, Hua Min Zhang, and Wu Xie. "MMSE-BLE Algorithm of Single-Carrier Multi-User Channel Capacity." Key Engineering Materials 480-481 (June 2011): 855–61. http://dx.doi.org/10.4028/www.scientific.net/kem.480-481.855.

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A kind of minimum mean square error linear equalizer (MMSE-BLE) algorithm is presented for the solution on channel capacity of single-carrier code division multiple accesses (SC-CDMA) system, this algorithm received data symbol vector multiplied by covariance matrix by using Wiener estimator, and gets the decorrelation of multiple access interference (MAI), inter-symbol interference (ISI) and noise. MMSE-BLE algorithm calculates the channel capacity with MMSE criterion algorithm, so that it can analyze the multi-user uplink channel capacity of space-time coding SC-CDMA system under the multipa

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10

Abdulkawi, Wazie M., Waqar Ahmad Malik, Sajjad Ur Rehman, Abdul Aziz, Abdel Fattah A. Sheta, and Majeed A. Alkanhal. "Design of a Compact Dual-Band MIMO Antenna System with High-Diversity Gain Performance in Both Frequency Bands." Micromachines 12, no. 4 (2021): 383. http://dx.doi.org/10.3390/mi12040383.

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A compact four-element dual-band multiple-input and multiple-output (MIMO) antenna system is proposed to achieve high isolation and low channel capacity loss. The MIMO antenna was designed and optimized to cover the dual-frequency bands; the first frequency band is a wide band, and it covers the frequency range of 1550–2650 MHz, while the other frequency band covers the 3350–3650 MHz range. The measured wide-band impedance bandwidths of 1.1 GHz and 300 MHz were achieved in the lower and upper frequency bands, respectively. The proposed structure consists of four novel antenna elements, along w

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11

Schlegel, Christian, Marat Burnashev, and Dmitri Truhachev. "Generalized Superposition Modulation and Iterative Demodulation: A Capacity Investigation." Journal of Electrical and Computer Engineering 2010 (2010): 1–9. http://dx.doi.org/10.1155/2010/153540.

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Modulation with correlated signal waveforms is considered. Such correlation arises naturally in a number of modern communications systems and channels, for example, in code-division multiple-access (CDMA) and multiple-antenna systems. Data entering the channel in parallel streams either naturally or via inverse multiplexing is transmitted redundantly by adding additional signal waveforms populating the same original time-frequency space, thus not requiring additional bandwidth or power. The transmitted data is spread over a frame ofNsignaling intervals by random permutations. The receiver comb

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12

Tsai, Lin‐Chuan. "Bandwidth enhancement in coplanar waveguide‐fed slot antennas designed for wideband code division multiple access/wireless local area network/worldwide interoperability for microwave access applications." IET Microwaves, Antennas & Propagation 8, no. 10 (2014): 724–29. http://dx.doi.org/10.1049/iet-map.2013.0562.

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13

Umamaheswari, R., M. Ramya Princess, and P. Nirmal Kumar. "Improved Whale Optimized MLP Neural Network-Based Learning Mechanism for Multiuser Detection in MIMO Communication System." Journal of Circuits, Systems and Computers 29, no. 15 (2020): 2050239. http://dx.doi.org/10.1142/s0218126620502394.

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Direct-Sequence Code Division Multiple Access (DS-CDMA) is a digital method to spread spectrum modulation for digital signal transmission. We propose to detect signal in DS-CDMA communication using the learning mechanism. Initially, the user signals are spread using the respective pseudo-noise (PN) code where the input signal is multiplied with the code which is then modulated using the quadrature phase shift keying (QPSK) modulator. The modulated signal is then transmitted in a 3G/4G channel considering all types of fading. The transmitted signal is received by the antenna array which is perf

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14

Zhang, Jiang, Hang Zhang, and Zhifu Cui. "Dual-antenna-based blind joint hostile jamming cancellation and multi-user detection for uplink of asynchronous direct-sequence code-division multiple access systems." IET Communications 7, no. 10 (2013): 911–21. http://dx.doi.org/10.1049/iet-com.2013.0036.

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15

Moro, A., and U. Spagnolini. "Error probability of direct sequence-code division multiple access systems with adaptive antenna minimum mean-square error multiuser receivers in Rayleigh-lognormal fading." IET Communications 3, no. 10 (2009): 1649. http://dx.doi.org/10.1049/iet-com.2008.0528.

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16

Diet, Antoine M., Nicolas Ribière-Tharaud, Martine Villegas, and Geneviève Baudoin. "Front-end HPA/antenna for multi-radio." International Journal of Microwave and Wireless Technologies 4, no. 5 (2012): 483–93. http://dx.doi.org/10.1017/s1759078712000372.

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This paper focuses on multi-radio front-end transmitter, a function implied by cognitive radio (0.5–6 GHz). S and C bands standards (wireless local and metropolitan area networks) present a challenge, due to the signal modulation schemes (orthogonal frequency division multiplex (OFDM)/WCDMA, wideband code division multiple access) dynamic (tens of dBs), driving us to a mandatory transmitter linearization. The idea is to provide frequency, flexibility, and average power control of a multi-radio high-efficiency front end for such signals (polar/envelope elimination and restoration (EER) structur

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17

Berceanu, Madalina-Georgiana, Carmen Florea, and Simona Halunga. "Performance Comparison of Massive MIMO System with Orthogonal and Nonorthogonal Multiple Access for Uplink in 5G Systems." Applied Sciences 10, no. 20 (2020): 7139. http://dx.doi.org/10.3390/app10207139.

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In the attempt to respond to market demands, new techniques for wireless communication systems have been proposed to ensure, to all active users that are sharing the same network cell, an increased quality of service, regardless of any environmental factors, such as their position within the cell, time, space, climate, and noise. One example is the nonorthogonal multiple access (NOMA) technique, proposed within the 5G standard, known for supporting a massive connectivity and a more efficient use of radio resources. This paper presents two new sets of complex codes— multiple-user shared-access

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18

Issa Mohsin, Asma, Asaad S. Daghal, and Adheed Hasan Sallomi. "A beamforming study of the linear antenna array using grey wolf optimization algorithm." Indonesian Journal of Electrical Engineering and Computer Science 20, no. 3 (2020): 1538. http://dx.doi.org/10.11591/ijeecs.v20.i3.pp1538-1546.

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<p><br />The grey wolf optimization (GWO) algorithm is considered an inspired meta-heuristic algorithm, which inspired by the social hierarchy and hunting behavior of the grey wolves. GWO has a high-performance capability of solving constrained, as well as unconstrained optimization problems. In this paper, the beamforming of smart antennas in a code division multiple access system based on the GWO algorithm is investigated. The sidelobe level (SLL) is minimized along with peak sidelobe level reduction, as well as an optimal beam pattern has been accomplished by using GWO to unifor

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19

"Efficient Turbo Inter-Leaver Based MIMO-OFDM System For Low Complexity Outdoor Communication." International Journal of Engineering and Advanced Technology 9, no. 1 (2019): 3154–62. http://dx.doi.org/10.35940/ijeat.a9778.109119.

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An arrangement of multiple antennas in both the receiver and transmitter called Multiple Input and Multiple Output (MIMO). The Orthogonal Frequency Division Multiplexing (OFDM) is enabled in MIMO system for high data wireless communications. Combination of both MIMO and OFDM Access (OFDMA) is a growing technology in next generation communication systems. In this work, the Bit Error Rate (BER) performance of MIMO-OFDMA is analyzed with Orthogonal Space Time Block Code (OSTBC), Maximum Ratio Combining (MRC) and Turbo coding scheme over flat fading channel are named as MIMO-MRC-OFDMA. OSTBC is a

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