Distributed Downlink Beamforming in Cellular Networks

We consider a cellular network where base stations can cooperate to determine the signals to be transmitted on the downlink. Using a particular downlink beamformer structure, we recast our downlink beamforming problem as a virtual linear minimum mean square error (LMMSE) estimation problem. Based on this virtual set up, we remodel the network as a factor graph with loops and present a simple distributed cooperative scheme for base stations based on the sum-product algorithm. We study the condition for convergence for the distributed algorithm and demonstrate its performance via simulations.

[1]  Roy D. Yates,et al.  A Framework for Uplink Power Control in Cellular Radio Systems , 1995, IEEE J. Sel. Areas Commun..

[2]  Brendan J. Frey,et al.  Factor graphs and the sum-product algorithm , 2001, IEEE Trans. Inf. Theory.

[3]  Ami Wiesel,et al.  Linear precoding via conic optimization for fixed MIMO receivers , 2006, IEEE Transactions on Signal Processing.

[4]  Mauro Passacantando,et al.  SOLUTION METHODS FOR , 2008 .

[5]  A. Lee Swindlehurst,et al.  A vector-perturbation technique for near-capacity multiantenna multiuser communication-part I: channel inversion and regularization , 2005, IEEE Transactions on Communications.

[6]  William T. Freeman,et al.  Correctness of Belief Propagation in Gaussian Graphical Models of Arbitrary Topology , 1999, Neural Computation.

[7]  Jamie S. Evans,et al.  Transmit beamforming with cooperative base stations , 2005, Proceedings. International Symposium on Information Theory, 2005. ISIT 2005..

[8]  Shlomo Shamai,et al.  Enhancing the cellular downlink capacity via co-processing at the transmitting end , 2001, IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Proceedings (Cat. No.01CH37202).

[9]  Ross D. Murch,et al.  Transmit-preprocessing techniques with simplified receivers for the downlink of MISO TDD-CDMA systems , 2004, IEEE Transactions on Vehicular Technology.

[10]  Brendan J. Frey,et al.  Local Probability Propagation for Factor Analysis , 1999, NIPS.

[11]  Syed A. Jafar,et al.  Transmitter optimization for multiple antenna cellular systems , 2002, Proceedings IEEE International Symposium on Information Theory,.

[12]  Benjamin Van Roy,et al.  An analysis of belief propagation on the turbo decoding graph with Gaussian densities , 2001, IEEE Trans. Inf. Theory.

[13]  Josef A. Nossek,et al.  Transmit Wiener filter for the downlink of TDDDS-CDMA systems , 2002, IEEE Seventh International Symposium on Spread Spectrum Techniques and Applications,.