Capacity and power control in spread spectrum macrodiversity radio networks

Stephen V. Hanly*

*Corresponding author for this work

Research output: Contribution to journalArticle

96 Citations (Scopus)

Abstract

What is the capacity of the uplink of a radio network of receivers? We consider a spread spectrum model in which each user is decoded by all the receivers in the network (macrodiversity). We use a carrier-to-interference performance criterion that we derive from Shannon theory; each user must find the right transmitter power level to satisfy its carrier-to-interference constraint. Satisfying this requirement for all users is equivalent to solving a fixed point problem. We use this power control problem to derive the network capacity region and find that the feasibility of a configuration of users is independent of their positions in the network; each user can be assigned a bandwidth that is independent of the user's position in the network. Our capacity region is an upper bound over all schemes that treat the interference of other users as pure noise. To show that the capacity can be realized in practice we propose a decentralized power adaptation algorithm and prove global convergence to the fixed point via a monotonicity argument.

Original languageEnglish
Pages (from-to)247-256
Number of pages10
JournalIEEE Transactions on Communications
Volume44
Issue number2
DOIs
Publication statusPublished - 1996
Externally publishedYes

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