DSP implementation of an efficient bit allocation algorithm for indoor wireless multicarrier systems

Cudnoch, M.; Wyglinski, Alexander M.; Labeau, Fabrice

doi:10.1109/wcnc.2006.1696567

Cited by 4 publications

References 7 publications

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Hybrid ARQ with Rate Adaptation in Multiband OFDM UWB Systems

Wang

Ryu

Chen

et al. 2009

2009 IEEE International Conference on Communications

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Abstract-In this paper, we propose a cross-layer design (CLD) scheme combining rate adaptation and four types of hybrid automatic repeat request (HARQ) for multiband orthogonal frequency division multiplexing (MB-OFDM) ultra wideband (UWB) systems following the ECMA-368 standard. The time varying property is incorporated into standard UWB channel models for the purpose of investigating rate adaptation. To accurately accommodate fast time-varying channel conditions, we propose to embed the selected rate information into the acknowledgement (ACK) frames. It is shown that the proposed CLD scheme combining rate adaptation and HARQ can provide higher throughput than the HARQ-only schemes. Among the four types of HARQ schemes, HARQ Type-III has the best throughput performance while Type I has the worst.

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Hybrid ARQ with Rate Adaptation in Multiband OFDM UWB Systems

Wang

Ryu

Chen

et al. 2009

2009 IEEE International Conference on Communications

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An efficient bit and power allocation algorithm for multi-carrier systems

Qing

Jiao

2009

2009 International Conference on Communications, Circuits and Systems

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Tap Loading of Subcarrier Equalizers for Wireless Multicarrier Transceivers

Wyglinski

Cudnoch²,

Labeau

et al. 2008

IEEE Trans. Veh. Technol.

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Abstract-We present a novel algorithm for defining the lengths of subcarrier equalizers employed by wireless multicarrier transmission systems operating in frequency-selective fading channels. The equalizer lengths across the subcarriers are incrementally varied in a "greedy" fashion until the global cost function is below some prescribed threshold. By varying the equalizer lengths, the overall complexity of the equalization is constrained while the system meets a minimum error performance. Moreover, we investigate four strategies for terminating the proposed algorithm when an adequate number of equalizer taps have been allocated in this process. The results show that a system that employs variable-length equalizers defined by the proposed algorithm can achieve an improvement in error robustness of as much as an order of magnitude, relative to a system that employs constantlength equalizers with the same overall complexity.

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DSP implementation of an efficient bit allocation algorithm for indoor wireless multicarrier systems

Cited by 4 publications

References 7 publications

Hybrid ARQ with Rate Adaptation in Multiband OFDM UWB Systems

Hybrid ARQ with Rate Adaptation in Multiband OFDM UWB Systems

An efficient bit and power allocation algorithm for multi-carrier systems

Tap Loading of Subcarrier Equalizers for Wireless Multicarrier Transceivers

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