Spread spectrum FH-MFSK transmitter and receiver,申请号US19800157267-传众专利搜索

Spread spectrum FH-MFSK transmitter and receiver

申请公布号：US4383323(A)

申请号：US19800157267

申请日期：1980.06.09

申请公布日期：1983.05.10

申请人：

BELL TELEPHONE LABORATORIES, INCORPORATED

发明人：TIMOR, UZI

分类号：H04B1/713;H04J3/26;H04J13/00;H04J13/06;(IPC1-7):H04J6/00;H04K1/00

主分类号：H04B1/713

摘要：The present invention relates to transmitters (10) and receivers (30) for use in a spread spectrum radio communication system wherein transmitters generate FH-MFSK signals by adding elements of each user's Q level encoded message sample and that user's unique Q level, L-length frequency-hopping address sequence using the rules of algebra for finite fields. The receivers (a) spectrum analyze received transmissions during each chip or period of the L-length sequence to determine which Q level frequencies are received and (b) generate a set of decoded message signals by subtracting corresponding chip elements of a particular user's FH address sequence from those of the detected frequency levels using the rules of algebra for finite fields. The receivers then (c) determine which levels have a maximum length, and if only one then that level is determined as the correct message level and (d) if multiple maximum-length levels are determined then for each maximum-length level the set is permuted and the individual chips checked in a unique manner to determine the correct message level.