IEEE Transactions on Signal Processing,
vol. 46, no. 1, pp. 243-246, Jan. 1998.
Fast Estimation of Weight Vectors to Optimize Multi-Transmitter
Broadcast Channel Capacity
Murat Torlak (1),
Guanghan Xu (1),
Brian L. Evans (1),
Hui Liu (2)
(1) Department of Electrical and Computer Engineering,
Engineering Science Building,
The University of Texas at Austin,
Austin, TX 78712-1084 USA
(2) Department of Electrical and Computer Engineering,
University of Virginia, Charlottesville, VA
We improve capacity of broadcast channels by employing multiple
transmitters and exploiting the spatial diversity among the users.
We derive fast algorithms to compute
orthogonal, near-optimal, and optimal weight
vectors for broadcasting message signals to two and three users.
The key innovation is that we decouple the weight vectors in
the measure of channel capacity to
- simplify the optimization problem to a search for the maxima of a
smooth multidimensional function and
- derive closed-form expressions for the orthogonal and near-optimal
Last Updated 08/07/99.