Frequency offset diversity receiving system

Details Frequency offset diversity receiving system Frequency offset diversity receiving system

H - Electricity

04

B

325/95

H04B 7/08 (2006.01) H04B 7/185 (2006.01) H04L 1/06 (2006.01)

Patent

CA 1265845

ABSTRACT A diversity receiving system for differential detection of minimum shift key (MSK) signals. The system may by advantageously implemented in order to realize high quality mobile satellite communication systems where shadowing is a significant problem and channel bandwidth and power are constrained. Signals from each of a plurality of receiving branches are translated to different intermediate frequencies which differ from each other by multiples of the transmitted signal symbol rate. The intermediate frequency signals are summed and detected via a common differential detector, the latter being followed by a low pass filter having a bandwidth corresponding to a fraction of the symbol rate. The plural signals are easily and stablely combined at an intermediate frequency stage without phase adjusters, signal quality measurement circuits or switching controllers. Moreover, the error rate performance is equivalent to that of post detection equal gain combining diversity schemes, which require plural complete receiving systems.

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