Spread spectrum communications system

专利名称：Spread spectrum communications system发明人：Andrzej Partyka,Lee F. Crowley申请号：US07/589323申请日：19900927公开号：US05121407A公开日：19920609

摘要：A spread spectrum communication system for direct sequence transmission ofdigital information having a modulation format which is particularly suitable for indoorcommunication within residential, office and industrial structures. The modulation formatcombines BPSK or MSK spreading with FM carrier modulation by data bits and a carrierfrequency shift whose magnitude is related to both a chip rate and a spreading sequencelength. The carrier, chip clock and data clock are all synchronous and the sequencelength is an integral submultiple of the bit length. The system reduces the frequencyerror between the transmitter chip clock and the receiver chip clock to permit theelimination of a code phase tracking loop in the receiver to reduce the receivercomplexity. The receiver has an extended dynamic range which makes possible thereception of very strong signal without an automatic gain control loop (AGC) as well asreducing the time needed for code phase acquisition. The transmission system is highlyresistant to CW jamming and short distance multipath effects.

申请人：PITTWAY CORPORATION

代理机构：Ladas & Parry

更多信息请下载全文后查看