Patent ID: 7693032
Filing Date: 2010-04-06
Classification: H04B,H04L,H04W

Abstract:
1. A communication method in an OFDM (Orthogonal Frequency Division Multiplexing) system, the method comprising: adapting modulation schemes, coding rates, pilot patterns, and power levels of a signal to produce an adapted signal, wherein: generating, by the transmitter, a control information signal representing adaptation information, wherein the control information signal includes a single index value that refers to adaptation details of a modulation scheme, coding rate, pilot pattern, and power level; transmitting the adapted signal and the control information signal by the transmitter, separately or jointly; receiving the adapted signal and the control information signal by a receiver; looking-up the adaptation details from a look-up table at the receiver using the index value, wherein: measuring the channel state by the receiver, based on the received signals, wherein the measurements include: signal strength, average SINR (signal to interference plus noise ratio), variance in time, variance in frequency, variance in space, BER (bit error rate), FER (frame error rate), MSE (mean square error), or any combination thereof; and forming a probing sequence using the channel state measurements, computed channel quality information, or channel state measurements and computed channel quality information.