专利名称：Fast frequency/code search 发明人：Edward J. Nossen
申请号：US06/399879
申请日：19820719
公开号：US04485477A
公开日：
19841127
专利内容由知识产权出版社提供
摘要：A decoder for decoding received pseudo random sequence (PRS) codes modulated upon a carrier signal and having an original chip rate f. sub.c, and for correcting for unknown frequency shifts in the received PRS codes. The decoder includes a local oscillator for demodulating the carrier signal and detecting the received PRS codes and a signal source for generating X correction PRS codes each having a pattern of chips similar to the chip pattern of a predetermined one of the received PRS codes and each shifted in chip rate from f.sub.c by amounts which will provide a spectrum of frequencies spanning any expected frequency shift of a received PRS code. Also provided is a correlator for correlating each of the X correction PRS codes with each received PRS code at a rate f.sub.r to determine which particular correction PRS code produces the greatest correlation signal, where f.sub.r > > Further logic is responsive to the chip rate of the particular correction PRS code for correcting the output frequency of the local oscillator to compensate for the unknown frequency shift during the reception of subsequently received PRS codes.
申请人：RCA CORPORATION
代理人：Joseph S. Tripoli,Donald W. Phillion
更多信息请下载全文后查看fastjson字符串转数组

版权声明：本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198，我们将在24小时内删除。