Carrier offset tracking for a receiver using channel impulse res

Details Carrier offset tracking for a receiver using channel impulse res Carrier offset tracking for a receiver using channel impulse res

1993-08-13

1996-10-08

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3701051, 375344, H04J 306

Patent

active

055638880

ABSTRACT:
The present invention provides for carrier offset tracking which is particularly well suited for use in a receiver for digital cellular mobile telephones. The tracking includes storing samples received in time slots, generating estimates of the transmission channel impulse response, recording two samples of each tap of each channel impulse response estimate, generating frequency offset estimates from the phase difference in each time slot between the samples, combining this plurality of frequency offset estimates to generate a precise frequency offset estimate, and adjusting a controllable frequency source to compensate for the precise frequency offset estimate. Time-reversed operation further enhances performance and permits implementation with reasonable complexity for a standards compliant mobile receiver.

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