Patent ID: 7848356

Claim:
A method of channel estimation in a transmission system comprising a plurality of user terminals transmitting signals to a receiver node wherein each said user terminal is allotted a respective set of transmission subcarriers for transmission over a channel, comprising the steps of: allotting to said user terminals, respective test signal sequences for transmission over said channel; storing at said receiver node, information as to the respective sets of transmission subcarriers allotted to said user terminals for transmission over said channel as well as discrete spectra of said respective test signal sequences allotted to said user terminals; including said respective test signal sequences in said signals transmitted over said channel by said plurality of user terminals by using said respective sets of transmission subcarriers allotted thereto, whereby a combined test signal is produced at said receiving node; generating at said receiving node, a discrete spectrum of said combined test signal; and obtaining channel estimation as a function of said discrete spectrum of said combined test signal and said discrete spectra of said respective test signal sequences allotted to said user terminals.