Optimal joint power allocation and phase control for DS-CDMA cognitive radio networks

S. Ebrahim Safavi, K. P. Subbalakshmi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Efficient and fair resource allocation in cognitive radio (CR) networks under strict constraints imposed by the primary network is a challenging problem for underlay dynamic spectrum access (DSA) networks. Due to the distributed nature of secondary networks, traditional approaches are usually computationally inefficient in providing fair resource management while meeting severe constraints imposed by the primary network. In this paper we consider the scenario of homogeneous CDMA-based DSA network with one main primary receive-transmit pair and an arbitrary number of secondary users (SUs). Unlike the prior works, we consider the case where SUs can adaptively adjust their transmit directions besides transmit power according to available channel information. For such a scenario, we formulate the joint power allocation and phase control problem and find the optimal solution to maximize the total rate for the secondary network subject to interference and power constraints. Our method has a linear computational complexity and guarantees fairness among SUs. Numerical analysis show that introducing the phase control alleviates the restriction of strict interference constraint while keeping the efficiency of power allocation.

Original languageEnglish
Title of host publication2011 IEEE Global Telecommunications Conference, GLOBECOM 2011
DOIs
StatePublished - 2011
Event54th Annual IEEE Global Telecommunications Conference: "Energizing Global Communications", GLOBECOM 2011 - Houston, TX, United States
Duration: 5 Dec 20119 Dec 2011

Publication series

NameGLOBECOM - IEEE Global Telecommunications Conference

Conference

Conference54th Annual IEEE Global Telecommunications Conference: "Energizing Global Communications", GLOBECOM 2011
Country/TerritoryUnited States
CityHouston, TX
Period5/12/119/12/11

Keywords

  • Power Allocation and Phase Control
  • Rate Optimization
  • Underlay Dynamic Spectrum Access

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