Patent ID: 7869455
Filing Date: 2011-01-11
Classification: H04B,H04J

Abstract:
1. A code division multiplex (CDM) transmitting and receiving apparatus comprising a transmitting apparatus and N terminal units connected to the transmitting apparatus through N respective communication channels, N being an integer greater than one, wherein: for each one of the N communication channels, the transmitting apparatus has a pair of coders, operating in parallel and employing different spreading codes, for coding data to be transmitted on the one of the N communication channels to generate a pair of parallel coded signals, and a parallel-to-serial converter for converting the pair of parallel coded signals to a single serial coded signal, whereby for the N channels, N serial coded signals are obtained; the transmitting apparatus also has a multiplexer for multiplexing the N serial coded signals to generate a multiplexed signal and transmitting the multiplexed signal to the N terminal units; and each terminal unit among the N terminal units correlates the multiplexed signal with two different spreading codes, thereby obtaining a pair of parallel correlated signals representing decoded data, wherein the pair of coders for the j-th communication channel (j being an integer equal to any of 1 to N) operate in a first mode in which they code different data signals, or in a second mode in which they code identical data signals; and when the pair of coders for the j-th communication channel operate in the first mode, the terminal unit connected to the transmitting apparatus through the j-th communication channel processes, as received data, first and second decoded data signals respectively corresponding to the pair of parallel correlated signals; and when the pair of coders for the j-th communication channel operate in the second mode, the terminal unit connected to the transmitting apparatus through the j-th communication channel processes, as the received data, a third decoded data signal corresponding to an additive combination of the pair of parallel correlated signals.