Self-encoded spread spectrum for multirate multimedia communication in multipath channel
Liang Chi, Won Mee Jang, Lim Nguyen · Lincoln (University of Nebraska) · 2011
Abstract—In this paper, we propose the self-encoded spread spectrum (SESS) with multirate multimedia communication in multipath channel. In multirate multimedia SESS system, each application has their own transmission bit rate. The signal is transmitted through multipath channels each with different channel gain and time delay. We view the main path as the signal resource and other paths as interference. At the receiver side, decorrelation scheme is employed for the main path combined signal not only to reduce the crosstalk between different applica-tions, but also to provide a better estimation for the despreading sequence in the main path. Interference cancellation(IC) in the main path is adopted to improve the correlation detection and iterative detection(ID) performance. Finally the ID is employed to improve the bit error rate (BER). Index Terms—Multirate, multimedia, decorrelation, interfer-ence, iterative detection and self-encoded spread spectrum. I.