TY - GEN
T1 - Fixed-complexity vector perturbation with block diagonalization for MU-MIMO systems
AU - Mohaisen, Manar
AU - Hui, Bing
AU - Chang, Kyunghi
AU - Ji, Seunghwan
AU - Joung, Jinsoup
PY - 2009
Y1 - 2009
N2 - Block diagonalization (BD) is an attractive technique that transforms the multi-user multiple-input multipleoutput (MU-MIMO) channel into parallel single-user MIMO (SU-MIMO) channels with zero inter-user interference (IUI). In this paper, we combine the BD technique with two deterministic vector perturbation (VP) algorithms that reduce the transmit power in MU-MIMO systems with linear precoding. These techniques are the fixed-complexity sphere encoder (FSE) and the QR-decomposition with M-algorithm encoder (QRDM-E). In contrast to the conventional BD VP technique, which is based on the sphere encoder (SE), the proposed techniques have fixed complexity and a tradeoff between performance and complexity can be achieved by controlling the size of the set of candidates for the perturbation vector. Simulation results and analysis demonstrate the properness of the proposed techniques for the next generation mobile communications systems which are latency and computational complexity limited. In MU-MIMO system with 4 users each equipped with 2 receive antennas, simulation results show that the proposed BD-FSE and BD-QRDM-E outperforms the conventional BD-THP (Tomlinson Harashima precoding) by 5.5 and 7.4dB, respectively, at a target BER of 10-4.
AB - Block diagonalization (BD) is an attractive technique that transforms the multi-user multiple-input multipleoutput (MU-MIMO) channel into parallel single-user MIMO (SU-MIMO) channels with zero inter-user interference (IUI). In this paper, we combine the BD technique with two deterministic vector perturbation (VP) algorithms that reduce the transmit power in MU-MIMO systems with linear precoding. These techniques are the fixed-complexity sphere encoder (FSE) and the QR-decomposition with M-algorithm encoder (QRDM-E). In contrast to the conventional BD VP technique, which is based on the sphere encoder (SE), the proposed techniques have fixed complexity and a tradeoff between performance and complexity can be achieved by controlling the size of the set of candidates for the perturbation vector. Simulation results and analysis demonstrate the properness of the proposed techniques for the next generation mobile communications systems which are latency and computational complexity limited. In MU-MIMO system with 4 users each equipped with 2 receive antennas, simulation results show that the proposed BD-FSE and BD-QRDM-E outperforms the conventional BD-THP (Tomlinson Harashima precoding) by 5.5 and 7.4dB, respectively, at a target BER of 10-4.
KW - Block diagonalization
KW - Multi-user MIMO
KW - QRD-M encoder
KW - Sphere encoder
KW - Vector perturbation
UR - http://www.scopus.com/inward/record.url?scp=77952129648&partnerID=8YFLogxK
U2 - 10.1109/MICC.2009.5431503
DO - 10.1109/MICC.2009.5431503
M3 - Conference contribution
AN - SCOPUS:77952129648
SN - 9781424455324
T3 - Proceedings - MICC 2009: 2009 IEEE 9th Malaysia International Conference on Communications with a Special Workshop on Digital TV Contents
SP - 238
EP - 243
BT - Proceedings - MICC 2009
T2 - 2009 IEEE 9th Malaysia International Conference on Communications with a Special Workshop on Digital TV Contents, MICC 2009
Y2 - 15 December 2009 through 17 December 2009
ER -