Chip Interleaved Multirate and Multimedia Transmission in Self-Encoded Communication System with Iterative Detection over Fading Channels

Liang Chi, Won-Mee Jang, Lim Nguyen

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DOI: 10.4236/ijcns.2011.410077                

Abstract

In this paper, we investigate the self-encoded multirate and the multimedia (SEMM) transmission. In SEMM system, the spreading codes are derived from its own previously transmitted bits rather than the pseudorandom code generator. We employ block chip interleaving at the transmitter to combat the deep fading over the channels. At the receiver, decorrelation scheme separates the combined signals not only to reduce the crosstalk between different applications, but also provide a better estimation for the despreading sequence. Interference cancelation (IC) is also adopted to improve both the correlation detection and iterative detection (ID) performance. The simulation results show that the proposed scheme significantly improves performance over fading channels.

Keywords

Multirate, Multimedia, Decorrelation, Iterative Detection

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	L. Nguyen, “Self-Encoded Spread Spectrum and Multiple Access Communications,” IEEE 6th International Symposium on Spread Spectrum Techniques and Applications, ISSSTA 2000, NJIT, New Jersey, Vol. 2, 6-8 September 2000, pp. 394-398.
[2]	Y. S. Kim, W. M. Jang and L. Nguyen, “Chip-Interleaved Self-Encoded Multiple Access with Iterative Detection in Fading Channels,” Journal of Communications and Networks, Vol. 9, No. 1, 2007, pp. 50-55.
[3]	B. R. Vojcic and W. M. Jang, “Transmitter Precoding in Synchronous Multiuser Communications,” IEEE Transactions on Communications, Vol. 46, No. 10, 1998, pp. 1346-1355. doi:10.1109/26.725312
[4]	Sergio Verdu, “Multiuser Detection,” Cambridge Press, Cambridge, 1998, pp. 234-244.
[5]	W. M. Jang, L. Nguyen and M. Hempel, “Precoded Random Spreading Multiple Access System in AWGN Channels,” IEEE Transactions on Wireless Communications, Vol. 3, No. 5, September 2004, pp. 1477-1480. doi:10.1109/TWC.2004.834686
[6]	S. Verdu and S. Shamai, “Spectral Efficiency of CDMA with Random Spreading,” IEEE Transactions on Information Theory, Vol. 45, No. 2, March 1999, pp. 622-640. doi:10.1109/18.749007
[7]	L. Chi, W. M. Jang and L. Nguyen, “Self-Encoded Spread Spectrum for Multirate Multimedia Communication in Multi-Path Channel,” 7th International Conference on Digital Content, Multimedia Technology and Its Applications, IDCTA2011, Busan, August 2011, pp. 16-18.