Two-valued coding transmission of multi-rate quasi-synchronous CDMA signals convolved by real-valued self-orthogonal finite-length sequences

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Abstract: 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 code 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 distortions on amplitude limitation and quantization, and the interchannel and intersymbol interferences. Key–Words: multi-rate transmission, two-valued integrand code, self-orthogonal finite-length sequence, zero correlation zone, convolution, amplitude distortion, quasi-synchronous CDMA. 1

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