Decentralized Power Control for Random Access with Successive Interference Cancellation
| Autor: | Chongbin Xu, Xiaokang Lin, Li Ping, Sammy Chan, Peng Wang |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Power transmission
Optimization problem Computer Networks and Communications Computer science business.industry Distributed computing Throughput Multiuser detection Cognitive radio Single antenna interference cancellation Electrical and Electronic Engineering business Throughput (business) Random access Computer network Power control Communication channel |
| Zdroj: | IEEE Journal on Selected Areas in Communications. 31:2387-2396 |
| ISSN: | 0733-8716 |
| DOI: | 10.1109/jsac.2013.131113 |
| Popis: | This paper is concerned with the decentralized power allocation problem in random access systems. We propose a scheme that is especially suitable for systems requiring high throughput but with difficulty in establishing centralized control, such as cognitive radio environments. Specifically, we assume successive interference cancellation (SIC) at the receiver for multi-packet reception (MPR). We consider a decentralized random power transmission strategy where each user selects its transmitted power level randomly according to a power distribution conditioned on its own channel state. Our focus is on the design of this distribution such that the system packet throughput is maximized under rate and power constraints. We start from a two-user system. A main finding of this paper is that the supports of the optimal power distributions are of discrete nature. This finding greatly simplifies the distribution optimization problem. We also discuss a sub-optimal solution to systems with more than two users. Numerical results demonstrate that the proposed scheme can achieve noticeable performance improvement compared with conventional single-user detection (SUD) based ones and offer a flexible tradeoff between the system throughput and power consumption. |
| Databáze: | OpenAIRE |
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