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

In this paper, we investigate the self-encoded multirate and the multimedia (SEMM) transmission. In SEMM system, multiple applications transmit their information simultaneously with different bit rate via self-encoded spreading spectrum (SESS), where the spreading codes are derived from the previous bits rather than the pseudorandom code generator. At the transmitter, a block chip interleaving is employed to combat the deep fading over the wireless channels. At the receiver, a decorrelation scheme separates the combined signals to reduce the crosstalk between different applications, and provides a better estimation for the de-spreading sequence. In addition, 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 the performance over fading channels