Link adaptation of wideband OFDM systems in multi-path fading channel

Zhen, Li; Junde, Song; Mei, Song; Wenan, Zhou

doi:10.1109/ccece.2002.1012936

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…Adaptive modulation has also recently gained momentum in wireless systems because it provides more efficient use of channel. For OFDM systems the researchers in [7] and [13] investigated the adaptive modulation criteria. The proposed research in [9] had taken the time varying channel conditions for adaptive modulation and coding.…”

Section: Related Workmentioning

confidence: 99%

Adaptive Channel Coding and Modulation Scheme Selection for Achieving High Throughput in Wireless Networks

Sharif

Potdar

Ahmad

2010

2010 IEEE 24th International Conference on Advanced Information Networking and Applications Workshops

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Modern wireless communication demands reliable data communication at high throughput in severe channel conditions like narrowband interference, frequency selective fading due to multipath and attenuation of high frequencies. Traditional single carrier systems address this set of problems by the use of complex, computationally intensive equalization filters. The Orthogonal Frequency Division Multiplexing (OFDM) based system, as opposed to single-carrier systems, is considered to be the future of the wireless communication and is being used to achieve high data rate by overcoming severe channel conditions without the use of these complex filters. This paper discusses the problem of Adaptive Modulation scheme selection through an OFDM based system over parallel frequency selective fading channels. An adaptive coding scheme is proposed by using Generalized Concatenated Codes (GCC), which have simple structure and are designed in such a way that they are best suited for fading channels. GCC are based on binary cyclic codes. The criterion of the proposed research is to optimize the throughput of a wireless system. Depending on the quality of sub-channels an adaptive modulation selection scheme and code assigning method is proposed. The proposed research combats against channel impairments better than those used in conventional systems by exploiting individual sub-channel condition. Results show better performance in terms of higher throughput by minimizing the bit error rate.

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Section: Related Workmentioning

confidence: 99%

Adaptive Channel Coding and Modulation Scheme Selection for Achieving High Throughput in Wireless Networks

Sharif

Potdar

Ahmad

2010

2010 IEEE 24th International Conference on Advanced Information Networking and Applications Workshops

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“…Adaptive modulation for OFDM systems was among others investigated in [3] and [4]. The question of adaptive modulation and coding according to the instantaneous channel conditions was previously treated in [5].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Coding for OFDM Based Systems using Generalized Concatenated Codes

Al-Askary¹,

Sidiropoulos²,

Kunz³

et al.

2005 IEEE 61st Vehicular Technology Conference

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Orthogonal Frequency Division Multiplexing (OFDM) is considered to be a promising candidate for future high-speed wireless communication systems. In this paper we present an adaptive coding scheme for OFDM based systems using generalized concatenated codes. We study the performance of HIPERLAN/2 after encoding with the proposed coding scheme and compare it to the standard convolutional coding scheme currently used. The criteria of our study is the optimization of the throughput. Through the adaptive scheme, we propose a modulation selection based on the average quality of the channel, and a code assigning method for the different sub-channels, that adapts to the channel conditions. We argue that the proposed scheme protects the information better than the ones in the conventional systems, since the latter do not take advantage of the individual sub-channel condition. Our simulations show that lower packet error rate can be accomplished for even higher throughput.

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