Patent ID: 8073085

Claim:
A sampling resolution controller for an analog to digital converter in a receiver coupled to an analog signal source, the analog signal source comprising a preamble followed by a plurality of OFDM symbols from a first set of subcarrier frequencies associated with a first zone, at least one of said OFDM symbols including unique subcarriers from a different zone than said first zone, said analog to digital converter coupled to a baseband processor, the baseband processor distinguishing said preamble interval and each said OFDM symbol interval, said baseband processor also distinguishing said first set of subcarrier frequencies associated with said first zone from said different subcarriers in said OFDM symbols by examination of the subcarriers therein; said sampling resolution controller having a higher than nominal sampling resolution during a symbol which has said unique subcarriers from said different zone, and said nominal sampling resolution at other times; said sampling resolution controller generating a gain control value which varies the signal level of said analog signal source applied to said analog to digital converter, where said gain control value is determined at the end of the current symbol for use in a subsequent symbol.