This week's topic is:
Chip Interleaved Multirate and Multimedia Transmission in Self-Encoded Communication System with Iterative Detection over Fading Channels
In a SEMM system, multiple applications transmit their information simultaneously with different bit rates. The spreading method of each application is self-encoded spreading spectrum (SESS), where the spreading codes are derived from the previously transmitted bits rather than a pseudorandom code generator. Block chip interleaving is employed at the transmitter to combat deep fading over the 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 despreading sequence. Interference cancelation (IC) is also adopted to improve both the correlation detection and iterative detection (ID) performance.