A Study on Symbol and Sub-Carrier Mapping Techniques for MC-CDMA based on LDPC Code with Progressively Increased Column-Weight

Conference: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
09/11/2005 - 09/14/2005 at Berlin, Germany

Proceedings: PIMRC 2005

Pages: 5Language: englishTyp: PDF

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Miyazaki, Noriaki; Zheng, Chen; Suzuki, Toshinori; Shinonaga, Hideyuki (KDDI R&D Laboratories, 7-1 Hikarinooka, Yokosuka-shi, Kanagawa, 239-0847 Japan)

This paper proposes a symbol mapping scheme on sub-carriers in use of MC-CDMA (Multi Carrier-Code Division Multiple Access) and LDPC (Low-Density Parity-Check) codes. Aiming at high spectrum efficiency, 16QAM modulation and LDPC codes with the PICW (Progressively Increased Column-Weight) are used here. The PICW-LDPC code is proposed in our previous studies and is proved to have better decoding performance as rate-compatible LDPC codes. By adopting the proposed symbol mapping method, the FER (Frame Error Rate) performance of the PICW-LDPC code is improved, the required Es/N0 is reduced by 0.12 dB in an AWGN channel. In order to improve FER performance in the multi-path channel, the proposed sub-carrier mapping is further applied, and the required Es/N0 can also be reduced by 2.32 dB.