Patent ID: 7385617
Filing Date: 2008-06-10
Classification: H04L

Abstract:
1. A method of channel estimation for a multi-user broadband wireless transmission system having a multiple antenna receiver system for the transmission of signals from mobile transmitters and the reception of the signals at the multiple antenna receiver, comprising: each of the mobile transmitters changing the signals from a time domain to a frequency domain using a Fourier transform and a size of the Fourier transform for each mobile transmitter is N, not K, where N is a number of time domain samples, and K is a number of frequency domain symbols; receiving a pilot sequence from a first mobile user; introducing a pilot sequence delay into a pilot sequence of at least one further mobile user; receiving the pilot sequence including the pilot sequence delay from the at least one further mobile user; multiplying each received pilot sequence from the at least one further mobile user by a conjugate of the first mobile user pilot sequence to create a matched filter output; and calculating the channel estimation for the transmission of signals from mobile transmitters using the matched filter output.