IEEE Transactions on Communications
A scheduling scheme based on the SLNR criterion
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Eigenmode transmission for the MIMO broadcast channel with semi-orthogonal user selection
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
On wireless downlink scheduling of MIMO systems with homogeneous users
IEEE Transactions on Information Theory
Performance of different user selection algorithms for transmit power minimization
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
MIMO broadcast channels with spatial heterogeneity
IEEE Transactions on Wireless Communications
Eigen-based transceivers for the MIMO broadcast channel with semi-orthogonal user selection
IEEE Transactions on Signal Processing
EURASIP Journal on Wireless Communications and Networking
An optimal PSO distributed precoding algorithm in QRD-based multi-relay system
Future Generation Computer Systems
| Hi-index | 754.90 |
A simple signaling method for broadcast channels with multiple-transmit multiple-receive antennas is proposed. In this method, for each user, the direction in which the user has the maximum gain is determined. The best user in terms of the largest gain is selected. The corresponding direction is used as the modulation vector (MV) for the data stream transmitted to the selected user. The algorithm proceeds in a recursive manner where in each step, the search for the best direction is performed in the null space of the previously selected MVs. It is demonstrated that with the proposed method, each selected MV has no interference on the previously selected MVs. Dirty-paper coding is used to cancel the remaining interference. For the case that each receiver has one antenna, the presented scheme coincides with the known scheme based on Gram-Schmidt orthogonalization (QR decomposition). To analyze the performance of the scheme, an upper bound on the cumulative distribution function (CDF) of each subchannel is derived which is used to establish the diversity order and the asymptotic sum-rate of the scheme. It is shown that using fixed rate codebooks, the diversity order of the jth data stream, 1 les j les M, is equal to N(M - j + 1)(K - j + 1), where M, N, and K indicate the number of transmit antennas, the number of receive antennas, and the number of users, respectively. Furthermore, it is proven that the throughput of this scheme scales as M log log(K) and asymptotically (K rarr infin) tends to the sum-capacity of the multiple-input multiple-output (MIMO) broadcast channel. The simulation results indicate that the achieved sum-rate is close to the sum-capacity of the underlying broadcast channel.