Low-complexity turbo detection for single-carrier low-density parity-check-coded multiple-input multiple-output underwater acoustic communications

2011 ◽  
Vol 13 (4) ◽  
pp. 439-450 ◽  
Author(s):  
Longbao Wang ◽  
Jun Tao ◽  
Chengshan Xiao ◽  
T. C. Yang
Keyword(s):  
Multiple Input Multiple Output ◽  
Low Complexity ◽  
Underwater Acoustic Communications ◽  
Parity Check ◽  
Acoustic Communications ◽  
Single Carrier ◽  
Low Density Parity Check ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Turbo Detection

scholarly journals 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

2020 ◽  
Vol 37 (6) ◽  
pp. 1061-1074
Author(s):  
Lokesh Bhardwaj ◽  
Ritesh Kumar Mishra
Keyword(s):  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Base Station ◽  
Low Density ◽  
Pilot Contamination ◽  
Parity Check ◽  
Low Density Parity Check ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Sum Rate

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.

scholarly journals On the Performance of LDPC-Coded Massive MIMO Schemes with Power-Ordered NOMA Techniques

2021 ◽  
Vol 11 (18) ◽  
pp. 8684
Author(s):  
Mário Marques da Silva ◽  
Rui Dinis ◽  
Gelson Martins
Keyword(s):  
Multiple Access ◽  
Industrial Revolution ◽  
Multiple Input Multiple Output ◽  
Parity Check ◽  
Frequency Domain Equalization ◽  
Single Carrier ◽  
Fifth Generation ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Iot Devices

This article studies the power-ordered Non-Orthogonal Multiple Access (NOMA) techniques associated with Low-Density Parity-Check (LDPC) codes, adopted for use in the fifth generation of cellular communications (5G). Both conventional and cooperative NOMA are studied, associated with Single Carrier with Frequency Domain Equalization (SC-FDE) and massive Multiple-Input Multiple-Output (MIMO). Billions of Internet of Things (IoT) devices are aimed to be incorporated by the Fourth Industrial Revolution, requiring more efficient use of the spectrum. NOMA techniques have the potential to support that goal and represent strong candidates for incorporation into future releases of 5G. This article shows that combined schemes associated with both conventional and cooperative LDPC-coded NOMA achieve good performance while keeping the computational complexity at an acceptable level.

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