Methods and systems are provided for channel tracking utilizing multi-pass demodulation in which, during the second pass, decoded symbols are treated as known symbols which are used to calculate the error term used in updating the propagation characterization during the second pass. This allows a higher...http://www.google.com.hk/patents/US6320919?utm_source=gb-gplus-share專利 US6320919 - Adaptive channel characterization using decoded symbols
