Patent ID: 8774030

Claim:
A method of reducing resource overhead attributed to preambles in a communication system, said method comprising: transmitting, at a transmitter, one or more signals including a first packet in a first time-frequency grant, the first packet including a first set of one or more subcarriers, the first packet further including a full preamble including reference signal information for determining a total channel estimate for every subcarrier to be used in transmission of the first packet to at least a first receiver; and transmitting a second packet in a second time-frequency grant including a second set of one or more subcarriers, the second packet further including a reduced preamble when the at least one receiver can determine: (1) channel effect between the transmitter and the receiver from the full preamble previously transmitted; (2) a phase offset for each subcarrier from the reduced preamble transmitted with the second packet.