Title :
Comparison of zero-forcing methods for downlink spatial multiplexing in realistic multi-user MIMO channels
Author :
Galdo, Giovanni Del ; Haardt, Martin
Author_Institution :
Commun. Res. Lab., Ilmenau Univ. of Technol., Germany
Abstract :
The use of space-division multiple access (SDMA) in the downlink of a multi-user MIMO wireless communications system can offer a substantial gain in system throughput. We compare the throughput achieved by employing recently developed algorithms for transmit beamforming in multi-user MIMO systems. The block-diagonalization algorithm is a generalization of the channel inversion scheme which suppresses completely all interference among users, although allowing interference among different data streams. The successive optimization algorithm, on the other hand, solves the power minimization problem one user at a time, so that the n-th user produces no interference with respect to the m-th user, where 1≤m\n\n\t\t
Keywords :
MIMO systems; interference suppression; minimisation; multiuser channels; radio networks; radiofrequency interference; space division multiple access; block-diagonalization algorithm; channel inversion scheme; downlink spatial multiplexing; interference suppression; multi-user MIMO systems; multi-user channels; multiuser channels; power minimization problem; subspace-based grouping algorithm; successive optimization algorithm; throughput; transmit beamforming; wireless communication propagation model; zero-forcing methods; Array signal processing; Downlink; Geometry; Interference suppression; MIMO; Minimization methods; Multiaccess communication; Testing; Throughput; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th
Print_ISBN :
0-7803-8255-2
DOI :
10.1109/VETECS.2004.1387962
