TY - GEN

T1 - Iterative waterfilling for weighted rate sum maximization in MIMO-MAC

AU - Kobayashi, Mari

AU - Caire, Giuseppe

PY - 2006

Y1 - 2006

N2 - We consider the weighted sum rate maximization in Gaussian MIMO multiple access channel (MAC) under individual power constraints. This problem arises in the stability-wise optimal scheduling policy that allocates the resource as a function of the buffer queue states and the channel matrices in each time slot. The straightforward generalization of Yu et al.'s well-known iterative waterfilling algorithm for the sum rate maximization is non-trivial because the problem cannot reduce to decoupled single-user waterfilling-type solutions with arbitrary weights. Therefore, we propose a simple alternative treating multiple antennas at each transmitter as virtual single-antenna transmitters, which enables a iterative waterfilling-type algorithm. For a special case such as a OFDM-MAC, the proposed algorithm converges to the optimal solution faster than a steepest ascent algorithm and makes the convergence speed independent of the number of subcarriers.

AB - We consider the weighted sum rate maximization in Gaussian MIMO multiple access channel (MAC) under individual power constraints. This problem arises in the stability-wise optimal scheduling policy that allocates the resource as a function of the buffer queue states and the channel matrices in each time slot. The straightforward generalization of Yu et al.'s well-known iterative waterfilling algorithm for the sum rate maximization is non-trivial because the problem cannot reduce to decoupled single-user waterfilling-type solutions with arbitrary weights. Therefore, we propose a simple alternative treating multiple antennas at each transmitter as virtual single-antenna transmitters, which enables a iterative waterfilling-type algorithm. For a special case such as a OFDM-MAC, the proposed algorithm converges to the optimal solution faster than a steepest ascent algorithm and makes the convergence speed independent of the number of subcarriers.

UR - http://www.scopus.com/inward/record.url?scp=44349168635&partnerID=8YFLogxK

U2 - 10.1109/SPAWC.2006.346338

DO - 10.1109/SPAWC.2006.346338

M3 - Conference contribution

AN - SCOPUS:44349168635

SN - 078039710X

SN - 9780780397101

T3 - IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC

BT - 2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications, SPAWC

T2 - 2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications, SPAWC

Y2 - 2 July 2006 through 5 July 2006

ER -