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Error Correction by Redundant Bits in Constant Amplitude Multi-code CDMA
송희근,김성만,김범곤,김동석,고대원,김용철,Song, Hee-Keun,Kim, Sung-Man,Kim, Bum-Gon,Kim, Tong-Sok,Ko, Dae-Won,Kim, Yong-Cheol The Korea Institute of Information and Commucation 2006 韓國通信學會論文誌 Vol.31 No.11C
In this paper, we present two methods of correcting bit errors in constant amplitude multi-code (CAMC) CDMA, which uses the redundant bits only. The first method is a parity-based bit correction with hard-decision, where the received signals despread into n two-dimensional structure with both horizontal parity and vertical parity. Then, an erroneous bit is corrected for each $4{\times}4$ pattern. The second method is a turbo decoding, which is modified from the decoding of a single parity check product code (SPCPC). Experimental results show that, in the second method, the redundant bits in CAMC can be fully used for the error correction and so they are not really a loss of channel bandwidth. Hence, CAMC provides both a low peak-to-average power ratio and robustness to bit errors.
김성만(Sungman Kim),오태석(Taesuk Oh),김범곤(Bum Gon Kim),송희근(Hee Keun Song),김용철(Yong Cheol Kim) 한국방송·미디어공학회 2006 한국방송공학회 학술발표대회 논문집 Vol.2006 No.-
본 논문은 AWGN 채널상의 Single Parity Check(SPC) 다차원 product부호에서 LDPC(Low Density Parity Check)부호를 이용한 오류 정정의 성능을 제시한다. 기존 방법인 터보 부호 방식을 이용한 오류 정정과 비교하여 LDPC부호가 갖는 장점을 기술하고 실험을 통해 LDPC 부호를 이용한 오류 정정 성능도 터보부호와 대등함을 보인다.