Class of low cross correlation palindromic synchronization sequences for time tracking in synchronous multiple access communication systems

摘要

A star configured multiple access radio communication system wherein a hub station communicates, in time division multiplex mode, with a plurality of remote subscriber stations by a forward link signal path and the remote subscriber stations communicate with the hub on a return link signal path and wherein all received return link signals are time synchronous, and all signals possess the same time division multiplex structure in which a portion of the signal is dedicated to time synchronization. Each remote subscriber station has a synchronization burst sequence generator, each generated burst sequence is constructed such that the time tracking and synchronization process of each return link is relatively unaffected by all other remote stations. At the hub station there is a delay discrimi-nator for each remote subscriber, each delay discriminator includes a first and a second channel. The first channel has a one symbol delay device, a matched filter, and a squaring circuit. The second channel has a matched filter and a squaring circuit. A summing circuit sums the outputs of the squaring circuits, and an output sampler sample the incoming signals at an offset of half a symbol period with respect to the peak of the first matched filter.