Variable power and rate allocation using simple CQI for multiuser OFDMA-CDM systems

Kwang Soon Kim; Yun Hee Kim

doi:10.1109/TWC.2009.080413

Variable power and rate allocation using simple CQI for multiuser OFDMA-CDM systems

Kwang Soon Kim
, Yun Hee Kim

Research output: Contribution to journal › Article › peer-review

Abstract

This paper presents variable power and rate allocation (PRA) for a multiuser orthogonal frequency division multiple access code division multiplexing (OFDMA-CDM) system which exploits both orthogonality among users and symbol-level diversity. To predict the link performance, we analyze the postprocessing SNR as the transmit power (TP) varies when the minimum mean square error combiner (MMSEC) is employed. It is shown from analysis that the MMSEC SNR is nonlinear in TP, but is bounded by the harmonic and the arithmetic means of the subcarrier SNRs. From the observation, we propose two variable PRA methods using a simple channel quality indication and a required TP estimation method. Simulation results show that the proposed methods not only guarantee the target performance but also increase the throughput at the same or slightly increased feedback overhead compared with the fixed TP allocation case.

Original language	English
Article number	5089951
Pages (from-to)	2776-2782
Number of pages	7
Journal	IEEE Transactions on Wireless Communications
Volume	8
Issue number	6
DOIs	https://doi.org/10.1109/TWC.2009.080413
Publication status	Published - Jun 2009

Bibliographical note

Funding Information:
Manuscript received March 26, 2008; revised July 26, 2008, October 11, 2008, and January 9, 2009; accepted February 21, 2009. The associate editor coordinating the review of this letter and approving it for publication was H. Chen. K. S. Kim is with the Dept. of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, Korea (e-mail: [email protected]). Y. H. Kim is with the Dept. of Electronics and Radio Engineering, Kyung Hee University, Yongin, Gyeonggi 446-701, Korea (e-mail: [email protected]). This work was supported by the MKE, Korea, under the ITRC support program supervised by the IITA (IITA-2009-C1090-0902-0010). Digital Object Identifier 10.1109/TWC.2009.080413

Keywords

Code division multiplexing
Link adaptation power and rate allocation
MMSE receiver
OFDMA

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title = "Variable power and rate allocation using simple CQI for multiuser OFDMA-CDM systems",

abstract = "This paper presents variable power and rate allocation (PRA) for a multiuser orthogonal frequency division multiple access code division multiplexing (OFDMA-CDM) system which exploits both orthogonality among users and symbol-level diversity. To predict the link performance, we analyze the postprocessing SNR as the transmit power (TP) varies when the minimum mean square error combiner (MMSEC) is employed. It is shown from analysis that the MMSEC SNR is nonlinear in TP, but is bounded by the harmonic and the arithmetic means of the subcarrier SNRs. From the observation, we propose two variable PRA methods using a simple channel quality indication and a required TP estimation method. Simulation results show that the proposed methods not only guarantee the target performance but also increase the throughput at the same or slightly increased feedback overhead compared with the fixed TP allocation case.",

keywords = "Code division multiplexing, Link adaptation power and rate allocation, MMSE receiver, OFDMA",

author = "Kim, \{Kwang Soon\} and Kim, \{Yun Hee\}",

note = "Funding Information: Manuscript received March 26, 2008; revised July 26, 2008, October 11, 2008, and January 9, 2009; accepted February 21, 2009. The associate editor coordinating the review of this letter and approving it for publication was H. Chen. K. S. Kim is with the Dept. of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, Korea (e-mail: [email protected]). Y. H. Kim is with the Dept. of Electronics and Radio Engineering, Kyung Hee University, Yongin, Gyeonggi 446-701, Korea (e-mail: [email protected]). This work was supported by the MKE, Korea, under the ITRC support program supervised by the IITA (IITA-2009-C1090-0902-0010). Digital Object Identifier 10.1109/TWC.2009.080413",

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N2 - This paper presents variable power and rate allocation (PRA) for a multiuser orthogonal frequency division multiple access code division multiplexing (OFDMA-CDM) system which exploits both orthogonality among users and symbol-level diversity. To predict the link performance, we analyze the postprocessing SNR as the transmit power (TP) varies when the minimum mean square error combiner (MMSEC) is employed. It is shown from analysis that the MMSEC SNR is nonlinear in TP, but is bounded by the harmonic and the arithmetic means of the subcarrier SNRs. From the observation, we propose two variable PRA methods using a simple channel quality indication and a required TP estimation method. Simulation results show that the proposed methods not only guarantee the target performance but also increase the throughput at the same or slightly increased feedback overhead compared with the fixed TP allocation case.

AB - This paper presents variable power and rate allocation (PRA) for a multiuser orthogonal frequency division multiple access code division multiplexing (OFDMA-CDM) system which exploits both orthogonality among users and symbol-level diversity. To predict the link performance, we analyze the postprocessing SNR as the transmit power (TP) varies when the minimum mean square error combiner (MMSEC) is employed. It is shown from analysis that the MMSEC SNR is nonlinear in TP, but is bounded by the harmonic and the arithmetic means of the subcarrier SNRs. From the observation, we propose two variable PRA methods using a simple channel quality indication and a required TP estimation method. Simulation results show that the proposed methods not only guarantee the target performance but also increase the throughput at the same or slightly increased feedback overhead compared with the fixed TP allocation case.

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Variable power and rate allocation using simple CQI for multiuser OFDMA-CDM systems

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Bibliographical note

Keywords

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