Abstract
Multiantenna multicarrier code-division multiple access (MC-CDMA) technique has been attracting much attention for designing future broadband wireless systems. In addition, low-density parity-check (LDPC) code, a promising near-optimal error correction code, is also being widely considered in next generation communication systems. In this paper, we propose a simple method to construct a regular quasicyclic low-density parity-check (QC-LDPC) code to improve the transmission performance over the precoded MC-CDMA system with limited feedback. Simulation results show that the coding gain of the proposed QC-LDPC codes is larger than that of the Reed-Solomon codes, and the performance of the multiantenna MC-CDMA system can be greatly improved by these QC-LDPC codes when the data rate is high.
Highlights
Multicarrier code-division multiple access (MC-code division multiple access (CDMA)) systems are being considered as potential candidates for generation wireless communication system
The bit error rate (BER) performance of precoded multiantenna Multicarrier code-division multiple access (MC-CDMA) scheme is compared with the conventional MC-CDMA system
The precoded MC-CDMA can save up to more than 5 dB compared with conventional MC-CDMA scheme without precoder at an average BER level of 10−2
Summary
Multicarrier code-division multiple access (MC-CDMA) systems are being considered as potential candidates for generation wireless communication system. In this paper, switched-interleaving based transmit processing techniques are presented for both downlink and uplink MC-CDMA multiple-antenna systems. In multi-antenna MC-CDMA systems, several forward error correction (FEC) schemes were proposed to meet the high-speed transmission in recent years, such as ReedSolomon (RS) codes, turbo codes, and low-density parity check (LDPC) codes. We focus our attention on improving the performance of the multiantenna MC-CDMA system through the LDPC codes when the data rate is high that suits for 4G systems. Low-density parity-check (LDPC) codes are a class of capacity approaching linear block codes They were invented by Gallager in 1962 [7] but forgotten for over 30 years, mainly due to practical issues regarding their implementation. Parallel processing capability and good error correcting performance are some of the reasons why LDPC codes have received much attention and are being suggested for many communications systems. The performance of MC-CDMA system when the data rate is high can be greatly improved by these QC-LDPC codes
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