Patent ID: 8340232

Claim:
A base station configured to communicate with a plurality of subscriber stations of a wireless network, the base station comprising: an antenna array comprising a plurality of antennas configured to transmit data to the plurality of subscriber stations; and a cyclic prefix insertion block configured to: generate a first pilot signal preamble by adding a first cyclic prefix to a first pilot signal sequence; generate a second pilot signal preamble by adding a second cyclic prefix to a second pilot signal sequence; and transmit the first and second pilot signal preambles through the plurality of antennas, wherein the second pilot signal sequence is a circularly shifted copy of the first pilot signal sequence, wherein the first cyclic prefix comprises the last one or more samples of the first pilot signal sequence, and wherein a product of the length of the first and second cyclic prefix and the number of antennas does not exceed a length of the first and second pilot signal sequence, respectively.