Patent ID: 7751509
Filing Date: 2010-07-06
Classification: H04B,H04L

Abstract:
1. A receiver for demodulating a transmitted signal consisting of data symbols modulated on multiple subcarriers at different frequencies in the presence of multiple-access interference (MAI), comprising: means for exploiting extra samples added to the transmitted signal by a transmitter and not required for despreading, and not used as a cyclic prefix of repeated samples that are discarded during channel equalization, in order to mitigate effects of multiple-access interference in the presence of Doppler, wherein said means for exploiting includes means for sampling at frequency intervals that are smaller than a spacing between subcarriers, and a window configured to selectively support said extra samples for interference excision; means for combining windowed samples with weighting coefficients to provide a decision statistic with the effects of multiple-access interference mitigated; and means for determining the data symbols from a sequence of decision statistics.