Channel estimation frequency domain in a system of frequency-division multiple access with single carrier

摘要

Procedure channel estimate (h (1), h (2), ..., h (Nu)) in a transmission system division multiple access frequency with single carrier including a plurality of user terminals (UT1 , TU2, ..., TU Nu) that transmit signals (x (1), x (2), ..., x (Nu)) to a receiver node (BS), wherein each said user terminal (UT1 , TU2, ..., TU Nu) is assigned a respective set of transmission subcarriers for transmission over said channel, the method including the steps of: - assigning to said user terminals sequences of respective test signal (rp ) for transmission over said channel (h (1), h (2), ..., h (Nu)), - storing (400) in said receiving node (BS) information on the respective sets of subcarriers transmission assigned to said user terminals (TU1, TU2, ..., TU Nu) for transmission over said channel and discrete spectra of said sequences respective test signal (rp) assigned to said user terminals, characterized in that it further comprises the steps of: - including such sequences respective test signal (rp) in said signals (x (1), x (2), ..., x (Nu)) by said channel (h (1), h (2), ..., h (Nu)) transmitted by said plurality of user terminals (TU1, TU2, ..., TU Nu) using said respective sets of subcarriers of transmission assigned to these, so that a combined test signal at said receiving node occurs, - generating (208) at said receiving node (BS) the discrete spectrum of said combined test signal, and - obtain said channel estimation as a set of individual contributions, yielding each of said contributions as a function of a respective portion of said discrete spectrum of said combined test signal and one of said discrete spectra of said sequences of respective test signal (rp ) assigned to said user terminals (TU1, TU2, ... TU Nu).