Patent ID: 7756007

Claim:
A method for estimating channel response in a cellular wireless network using time division multiple access or time division multiple access-orthogonal frequency division multiplex access in a channel used for connecting a transmitting station equipped with at least one transmitting antenna to at least one receiving station equipped with multiple receiving antennas for receiving sequential modulated orthogonal frequency division multiplex symbols constituted by an assigned number of modulated subcarriers carrying data and pilot sequences assigned to pilot subcarriers diversely allocated in known positions of the orthogonal frequency division multiplex symbols, the channel being affected by sudden and large co-channel interference variations, comprising: generating a channel estimate by estimating all unknown elements of the channel response for all the pilot sequences on links between the at least one transmitting antenna and the receiving antennas, from both received signals and a copy of the pilot sequences stored in the receiving station; generating an interference estimate from a difference between received pilot sequences and a local reconstruction of the received pilot sequences; updating a running average of the interference estimate used in weighting the channel estimate; calculating a correlation value of the interference estimate between actual and preceding received symbols; comparing the correlation value against a threshold to decide whether there is a significant change in interference; and reinitializing the interference estimate, if the correlation value is lower than the threshold, otherwise continuing said updating of the running average.