Fast estimation of weight vectors to optimize multi-transmitter broadcast channel capacity

Author

Torlak, Murat ; Xu, Guanghan ; Evans, Brian L. ; Liu, Hui

Author_Institution

Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA

Volume

46

Issue

1

fYear

1998

fDate

1/1/1998 12:00:00 AM

Firstpage

243

Lastpage

246

Abstract

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 (1) simplify the optimization problem to a search for the maxima of a smooth multidimensional function and (2) derive closed-form expressions for the orthogonal and near-optimal algorithms

Keywords

cellular radio; channel capacity; diversity reception; land mobile radio; optimisation; radio broadcasting; radio transmitters; search problems; telecommunication channels; closed-form expressions; fast algorithms; fast estimation; message signal broadcasting; mobile cellular communications; multi-transmitter broadcast channel capacity optimisation; near-optimal algorithm; near-optimal weight vectors; optimal weight vectors; orthogonal algorithm; orthogonal weight vectors; smooth multidimensional function search; spatial diversity; weight vectors; wireless communications; Antenna arrays; Broadcasting; Channel capacity; Decoding; Iterative algorithms; Multidimensional systems; Signal processing algorithms; Signal to noise ratio; Transmitters; Wireless communication;

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/78.651228

Filename

651228