TY - GEN
T1 - Channel quantization algorithm for MIMO interference alignment with limited feedback
AU - Kim, Jin Sung
AU - Moon, Sung Hyun
AU - Lee, Sang Rim
AU - Lee, Inkyu
PY - 2012
Y1 - 2012
N2 - When perfect channel state information (CSI) is available at each transmitter in K-user multiple-input multiple-output (MIMO) interference channels, it was shown that interference alignment (IA) achieves a full spatial multiplexing gain. However, a significant performance loss is inevitable in the IA when the CSI is fed back from receivers using the limited number of feedback bits. In this paper, we propose a new channel quantization strategy to optimize the performance of the IA with limited feedback. In our proposed scheme, we introduce an additional receive filter to minimize the chordal distance which accounts for the quantization error on Grassmann manifold. Simulation results verify that the proposed scheme provides substantially better performance than the conventional method as the number of feedback bits is increased. We show that our scheme exhibits 30% and 40% sum rate gains compared to the conventional scheme when the numbers of the feedback bits are 10 and 15, respectively, with two antennas per node.
AB - When perfect channel state information (CSI) is available at each transmitter in K-user multiple-input multiple-output (MIMO) interference channels, it was shown that interference alignment (IA) achieves a full spatial multiplexing gain. However, a significant performance loss is inevitable in the IA when the CSI is fed back from receivers using the limited number of feedback bits. In this paper, we propose a new channel quantization strategy to optimize the performance of the IA with limited feedback. In our proposed scheme, we introduce an additional receive filter to minimize the chordal distance which accounts for the quantization error on Grassmann manifold. Simulation results verify that the proposed scheme provides substantially better performance than the conventional method as the number of feedback bits is increased. We show that our scheme exhibits 30% and 40% sum rate gains compared to the conventional scheme when the numbers of the feedback bits are 10 and 15, respectively, with two antennas per node.
UR - http://www.scopus.com/inward/record.url?scp=84871992815&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84871992815&partnerID=8YFLogxK
U2 - 10.1109/ICC.2012.6364092
DO - 10.1109/ICC.2012.6364092
M3 - Conference contribution
AN - SCOPUS:84871992815
SN - 9781457720529
T3 - IEEE International Conference on Communications
SP - 4252
EP - 4256
BT - 2012 IEEE International Conference on Communications, ICC 2012
T2 - 2012 IEEE International Conference on Communications, ICC 2012
Y2 - 10 June 2012 through 15 June 2012
ER -