CHANNEL ESTIMATION FOR OFDM COMMUNICATION SYSTEMS

摘要

Techniques to estimate the frequency response of a wireless channel in an OF DM system. In one method, an initial estimate of the frequency response of the wireless channel is obtained for a first group of subbands based on a pilot transmission received via the subbands in the first group. An estimate of th e impulse response of the wireless channel is then derived based on the initia l frequency response estimate. An enhanced estimate of the frequency response of the wireless channel is then derived for a second group of subbands based on the impulse response estimate. The first and second groups may each include all or only a subset of the usable subbands. Subband multiplexing may be use d to allow simultaneous pilot transmissions by multiple terminals on their associated groups of subbands.