A new M-ary wideband communication system with application to multipath channels-Part I: system performance

We present a new M-ary wideband communication system based on use of binary spread-spectrum sequences and a correlation receiver. The proposed system offers a significant savings in receiver complexity compared to classical M-ary systems as only one correlator is required and also the word synchronization can be automatically made. The sequences used here were primarily described by Yates and Holgate (1979) and generalized by Potter (1980). A set of Yates-Holgate (Y-H) sequences is constructed from a single m-sequence called the “parent”. When any sequence in the set is cross correlated with the “parent”, the obtained cross-correlation function (CCF) has a shape that simply and uniquely identifies that sequence-in the same time it defines the word synchronization. The transmitter associates k information bits to a sequence of N chips selected in a Y-H set of M=2 ^k sequences. The receiver correlates the received sequence with the parent and hence can decide what sequence has been transmitted. In this way, the receiver can recover the k information bits. In this paper (Part I of two), we present the performance of this system in a nonfading channel with additive white Gaussian noise and in some multipath channels