Two-valued integrand coding transmission of multi-rate quasi-synchronous CDMA signals convolved by real-valued self-orthogonal finite-length sequences
Jiong Le, Yoshihiro Tanada · 2008
Abstract: The next generation mobile communication system is desired to transmit multimedia information at multi-rate. Two-valued integrand codes are applied to the realization of the multi-rate quasi-synchronous CDMA system using real-valued self-orthogonal finite-length sequences with zero correlation zone. Each user data of multi-level and multi-interval and a common synchronizing sequence are convolved with the user sequence and converted to two-valued integrand coding signal. The signal passes through low pass filters in a transmitter and a receiver and is changed to a real-valued signal. In the receiver, the desired data are detected by the correlation processing with the respective code. This transmission system suppresses distortion on amplitude limitation and quantization, and interchannel and intersymbol interferences. Two-valued integrand coding contributes to easy amplification and modulation. Key–Words: multi-rate transmission, two-valued integrand code, self-orthogonal finite-length sequence, zero correlation zone, convolution, amplitude distortion, quasi-synchronous CDMA. 1