| 摘要 |
<p>This invention discloses a spread spectrum communication system and a decentralized control wireless network applying different phase sequences of a single spread spectrum code to realize CDMA. The system includes a clock extractor, a clock synchronization unit, a control time slot generation unit, a matching unit, a related multipath selection unit, a demodulation unit, a processing control unit, a PN code set generator, a code multipath selection unit, a spread spectrum modulation unit and a duplexer. The clock extractor receives wireless signals and provides a clock for the system. The clock synchronization unit generates Chip clock pulses that are synchronized to the clock. The matching unit receives the wireless signals to generate multipath matched signals while the related multipath selection unit selects related values in an assigned time slot for outputting to the demodulation unit. The demodulation unit finishes the demodulation of information carried by related peaks. At the same time, the processing control unit obtains the related data values in the assigned time slots to process data within a specified period. The processing control unit then assesses the pulse levels of related peaks and, depending on the state use of channels, selects suitable phase sequences as spread spectrum codes for transmitting signals, or selects an arranged phase sequence as the local spread spectrum code for reception use. Because the system applies different phase sequences of a single spread spectrum code for implementing CDMA, this allows nodes to realize dynamic distribution of spread spectrum code sequences, without the need of a control centre, such as a base station, for implementing the dynamic distribution of spread spectrum code sequences.</p> |
