The performance of an uplink Massive MIMO OFDM-based multiuser system with LDPC coding when using relays

Berceanu, Madalina-Georgiana; Voicu, Carmen; Halunga, Simona

doi:10.1109/siitme47687.2019.8990723

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…In [ 15 ], the authors applied the LDPC code in the network coded cooperation and designed the network LDPC coded cooperative system with multiple users and one relay. In addition, the studies [ 16 , 17 ] carried out the error performance analysis for the LDPC coded cooperative scheme with orthogonal frequency-division multiplexing.…”

Section: Introductionmentioning

confidence: 99%

Optimized Design of Distributed Quasi-Cyclic LDPC Coded Spatial Modulation

Zhao

Yang

Waweru

et al. 2023

Sensors

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We propose a distributed quasi-cyclic low-density parity-check (QC-LDPC) coded spatial modulation (D-QC-LDPCC-SM) scheme with source, relay and destination nodes. At the source and relay, two distinct QC-LDPC codes are used. The relay chooses partial source information bits for further encoding, and a distributed code corresponding to each selection is generated at the destination. To construct the best code, the optimal information bit selection algorithm by exhaustive search in the relay is proposed. However, the exhaustive-based search algorithm has large complexity for QC-LDPC codes with long block length. Then, we develop another low-complexity information bit selection algorithm by partial search. Moreover, the iterative decoding algorithm based on the three-layer Tanner graph is proposed at the destination to carry out joint decoding for the received signal. The recently developed polar-coded cooperative SM (PCC-SM) scheme does not adopt a better encoding method at the relay, which motivates us to compare it with the proposed D-QC-LDPCC-SM scheme. Simulations exhibit that the proposed exhaustive-based and partial-based search algorithms outperform the random selection approach by 1 and 1.2 dB, respectively. Because the proposed D-QC-LDPCC-SM system uses the optimized algorithm to select the information bits for further encoding, it outperforms the PCC-SM scheme by 3.1 dB.

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Section: Introductionmentioning

confidence: 99%

Optimized Design of Distributed Quasi-Cyclic LDPC Coded Spatial Modulation

Zhao

Yang

Waweru

et al. 2023

Sensors

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“…It has been proposed that the error correction coding in MU-m-MIMO systems with phase shift keying outperforms the conventional MIMO technology [25]. Incorporation of orthogonal frequency division multiplexing (OFDM) and LDPC codes with m-MIMO using non-regenerative relays improves the information quality at BS by implementing an MMSE detector with successive interference cancellation (SIC) [26].…”

Section: Introductionmentioning

confidence: 99%

Mitigating the Interference Caused by Pilot Contamination in Multi-cell Massive Multiple Input Multiple Output Systems Using Low Density Parity Check Codes in Uplink Scenario

Bhardwaj¹,

Mishra²

2020

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The effects of pilot contamination (PC) on the performance of multi-cell multi-user massive multiple input multiple output (MC-MU-m-MIMO) system in uplink has been analyzed in this article. In a multi-cell scenario, the channel estimation (CE) at the desired cell using pilot reuse to avoid significant overhead results in poor CE due to PC. The improvement in degraded performance due to the effect of PC has been shown using low Density Parity Check (LDPC) codes. The comparative analysis of performance in terms of variation in bit error rate (BER) with the signal to noise ratio (SNR) for LDPC coded and uncoded information blocks of users has been shown when the number of cells sharing the same frequency band is varied. Further, the expression for sum-rate has been derived and its variation with the number of base station (BS) antennas has also been shown. The simulated results have shown that the LDPC coded scheme performs better than the uncoded counterpart and the sum-rate capacity increases when the strength of channel coefficients between the BS antennas of the desired cell and the users of remaining cells is less.

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The performance of an uplink Massive MIMO OFDM-based multiuser system with LDPC coding when using relays

Cited by 2 publications

References 18 publications

Optimized Design of Distributed Quasi-Cyclic LDPC Coded Spatial Modulation

Optimized Design of Distributed Quasi-Cyclic LDPC Coded Spatial Modulation

Mitigating the Interference Caused by Pilot Contamination in Multi-cell Massive Multiple Input Multiple Output Systems Using Low Density Parity Check Codes in Uplink Scenario

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