Adaptive Rate and Power Transmission for OFDM-based Cognitive Radio Systems

Ebrahim Bedeer Mohamed, Octavia A. Dobre, Mohamed Hossam Ahmed, Kareem E. Baddour

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

This paper studies the joint rate and power allocation problem for OFDM-based cognitive radio systems where secondary users (SUs) can opportunistically access the spectrum of primary users (PUs). We propose a novel algorithm that jointly maximizes the OFDM-based cognitive radio system throughput and minimizes its transmit power, while guaranteeing a target bit error rate per subcarrier and restricting both co-channel interference (CCI) and adjacent channel interference (ACI) to existing primary users. Since estimating the instantaneous channel gains on the links between the SU transmitter and the PUs receivers is impractical, we assume only knowledge of the path loss on these links. Closed-form expressions are derived for the close-to-optimal bit and power distributions. Simulation results are described that illustrate the performance of the proposed scheme and show its closeness to that of an exhaustive search for the discrete optimal allocations. Further, the results quantify the violation ratio of both the CCI and ACI constraints at the PUs receivers due to the partial channel information. The effect of adding a fading margin to reduce the violation ratio is also studied.
LanguageEnglish
Journal2014 IEEE International Conference on Communications (ICC)
DOIs
Publication statusPublished - 7 Nov 2013
Event2013 IEEE International Conference on Communications (ICC) - Budapest, Hungary
Duration: 9 Jun 201313 Jun 2013

Fingerprint

Radio systems
Cognitive radio
Power transmission
Orthogonal frequency division multiplexing
Bit error rate
Telecommunication links
Transmitters
Throughput

Keywords

  • Throughput
  • Receivers
  • OFDM
  • Frequency modulation
  • Interference
  • Bit error rate
  • Optimization

Cite this

Mohamed, Ebrahim Bedeer ; Dobre, Octavia A. ; Ahmed, Mohamed Hossam ; Baddour, Kareem E. / Adaptive Rate and Power Transmission for OFDM-based Cognitive Radio Systems. 2013.
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Adaptive Rate and Power Transmission for OFDM-based Cognitive Radio Systems. / Mohamed, Ebrahim Bedeer; Dobre, Octavia A.; Ahmed, Mohamed Hossam; Baddour, Kareem E.

07.11.2013.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Adaptive Rate and Power Transmission for OFDM-based Cognitive Radio Systems

AU - Mohamed, Ebrahim Bedeer

AU - Dobre, Octavia A.

AU - Ahmed, Mohamed Hossam

AU - Baddour, Kareem E.

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N2 - This paper studies the joint rate and power allocation problem for OFDM-based cognitive radio systems where secondary users (SUs) can opportunistically access the spectrum of primary users (PUs). We propose a novel algorithm that jointly maximizes the OFDM-based cognitive radio system throughput and minimizes its transmit power, while guaranteeing a target bit error rate per subcarrier and restricting both co-channel interference (CCI) and adjacent channel interference (ACI) to existing primary users. Since estimating the instantaneous channel gains on the links between the SU transmitter and the PUs receivers is impractical, we assume only knowledge of the path loss on these links. Closed-form expressions are derived for the close-to-optimal bit and power distributions. Simulation results are described that illustrate the performance of the proposed scheme and show its closeness to that of an exhaustive search for the discrete optimal allocations. Further, the results quantify the violation ratio of both the CCI and ACI constraints at the PUs receivers due to the partial channel information. The effect of adding a fading margin to reduce the violation ratio is also studied.

AB - This paper studies the joint rate and power allocation problem for OFDM-based cognitive radio systems where secondary users (SUs) can opportunistically access the spectrum of primary users (PUs). We propose a novel algorithm that jointly maximizes the OFDM-based cognitive radio system throughput and minimizes its transmit power, while guaranteeing a target bit error rate per subcarrier and restricting both co-channel interference (CCI) and adjacent channel interference (ACI) to existing primary users. Since estimating the instantaneous channel gains on the links between the SU transmitter and the PUs receivers is impractical, we assume only knowledge of the path loss on these links. Closed-form expressions are derived for the close-to-optimal bit and power distributions. Simulation results are described that illustrate the performance of the proposed scheme and show its closeness to that of an exhaustive search for the discrete optimal allocations. Further, the results quantify the violation ratio of both the CCI and ACI constraints at the PUs receivers due to the partial channel information. The effect of adding a fading margin to reduce the violation ratio is also studied.

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KW - Frequency modulation

KW - Interference

KW - Bit error rate

KW - Optimization

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