Method and Apparatus for Offset Frequency Estimation for a Coherent Receiver

摘要

A method and apparatus for improved offset frequency estimation includes in a first embodiment a receiver (100) for coherent reception of a signal having known reference information the receiver includ ing an extractor (106) for extracting the reference info rmation (107) from the signal, and an offset frequency estimator (110). The offset f requency estimator (110) includes a filter (121) for fil tering the reference information and outputting a filtered reference sequence; a correl ator (122, 124) for correlating the filtered reference s equence against a predetermined reference signal to form correlation values; and a p eak detector (126) for determining an offset frequency e stimate (131) from the correlation values. Other embodiments are also shown.