ON-THE-FLY COMPENSATION OF SAMPLING FREQUENCY AND PHASE OFFSET IN RECEIVER PERFORMING ULTRA-HIGH-SPEED WIRELESS COMMUNICATION

摘要

ProblemTo restore data in a transmitted symbol sequence without aligning the clockof the receiver with the clock of the transmitter.SolutionReceived data oversampled twice is polyphased by the receiver, feedback isapplied using an adaptive algorithm, and the filter coefficients (tapcoefficient sequence) of a compensation filter are simultaneously shiftedwhen the data shifts. The sampling frequency and the phase offset can becompensated for on the fly using a filter combining a tapped filter whoseinitial value is a correlation value obtained from the preamble and header ofa received signal, and a wavefront aligner. In this configuration, aresampling filter circuit, an equalization filter circuit and a decimationfiltercircuit are realized in a single compensation filter circuit, which is muchsmaller than the prior art circuits in terms of size.