TY - GEN
T1 - Coordinated beamforming with relaxed zero forcing
AU - Lee, G.
AU - Park, J.
AU - Sung, Y.
AU - Yukawa, M.
PY - 2011/12/1
Y1 - 2011/12/1
N2 - In this paper, a new beam design paradigm for coordinated beamforming (CB) for current and future cellular networks is proposed based on a relaxed zero-forcing (RZF) constraint. In the conventional zero-forcing (ZF) CB, each cooperating transmitter designs its transmit beamforming matrix to null out interference to undesired receivers completely. In the proposed RZF paradigm, however, the ZF constraint is relaxed so that a tolerable amount of interference leakage to undesired receivers is allowed for the beam design at each transmitter. By relaxing the ZF constraint in such a way, transmitters have more degrees of freedom for their beam design to increase the overall data rate of the network. An efficient algorithm for the RZFCB is proposed based on a projected subgradient method. Numerical results show that the proposed RZFCB shows a noticeable gain over the conventional ZFCB.
AB - In this paper, a new beam design paradigm for coordinated beamforming (CB) for current and future cellular networks is proposed based on a relaxed zero-forcing (RZF) constraint. In the conventional zero-forcing (ZF) CB, each cooperating transmitter designs its transmit beamforming matrix to null out interference to undesired receivers completely. In the proposed RZF paradigm, however, the ZF constraint is relaxed so that a tolerable amount of interference leakage to undesired receivers is allowed for the beam design at each transmitter. By relaxing the ZF constraint in such a way, transmitters have more degrees of freedom for their beam design to increase the overall data rate of the network. An efficient algorithm for the RZFCB is proposed based on a projected subgradient method. Numerical results show that the proposed RZFCB shows a noticeable gain over the conventional ZFCB.
KW - Coordinated beamforming
KW - Interference channel
KW - MIMO system
KW - Projected subgradient method
KW - Zero-forcing
UR - http://www.scopus.com/inward/record.url?scp=84555195038&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84555195038&partnerID=8YFLogxK
U2 - 10.1109/WCSP.2011.6096925
DO - 10.1109/WCSP.2011.6096925
M3 - Conference contribution
AN - SCOPUS:84555195038
SN - 9781457710100
T3 - 2011 International Conference on Wireless Communications and Signal Processing, WCSP 2011
BT - 2011 International Conference on Wireless Communications and Signal Processing, WCSP 2011
T2 - 2011 International Conference on Wireless Communications and Signal Processing, WCSP 2011
Y2 - 9 November 2011 through 11 November 2011
ER -