Cognitive-relay-based intercell interference cancellation in cellular systems

Hongbing Cheng, Yu Dong Yao

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

This paper proposes to use a cognitive-relay technique to mitigate intercell interference (ICI) in cellular systems. In the proposed system, several relay stations (RSs) that are equipped with cognitive radio are deployed near the cell boundary. The base station (BS) and the RS in each cell operate in the same spectrum band as primary and secondary transmitters, respectively. Once an interference-limited mobile station (MS) requests an RS for assistance, the RS senses the spectrum band and accesses a spectrum hole to forward its received signal (and interference) to the MS. At the receiver of the MS, optimum combining is employed to combine the original signal that is received from the BS and the relayed signal to cancel the ICI. The system performance is analyzed in terms of the outage capacity and the average capacity considering the impact of the availability of cognitive-relay channels and the link quality between the RS and the MS. The location and the coverage radius of the RS are designed based on the requirement of the RS-MS link quality. Finally, simulation results are given to validate the theoretical analysis and to show the capacity improvement due to the ICI cancellation with the assistance of cognitive relay.

Original languageEnglish
Article number5395648
Pages (from-to)1901-1909
Number of pages9
JournalIEEE Transactions on Vehicular Technology
Volume59
Issue number4
DOIs
StatePublished - May 2010

Keywords

  • Cognitive relay
  • Intercell interference (ICI)
  • Optimum combining

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