Outage Capacity and Cutoff Rate of Bit-Interleaved Coded OFDM under Quasi-Static Frequency Selective Fading

Ekbal, Amal; Song, Kee-Bong; Cioffi, J.M.

doi:10.1109/glocom.2003.1258399

Cited by 15 publications

(6 citation statements)

References 7 publications

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“…, L. Each symbol inside a block will use the same signal set and have the same average energy. Note: Such a block fading approximation is not new and has been used in [6], [10] among others. Figure 1 shows a diagram of the proposed adaptive modulation system.…”

Section: System Model and Preliminariesmentioning

confidence: 98%

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Adaptive Modulation for Limited Diversity Fading Channels

Nagaraj

Sarkar

2009

2009 IEEE 70th Vehicular Technology Conference Fall

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In this paper, we describe a recently proposed bitloading algorithm and a novel power-loading algorithm for block fading channels with channel state information (CSI) at the transmitter. We consider channels that offer a relatively small order of diversity, the so-called limited diversity fading channels. Limited diversity channels such as those encountered in indoor orthogonal frequency division multiplexing systems are characterized by the fact that achievable diversity orders are small and are limited by the channel and not by complexity of the code used. We first discuss a recently proposed analysis technique for the performance of bit-interleaved coded modulation on block fading channels. We then describe a bit-loading technique for maximizing the throughput at a fixed bit error probability. We also propose a new and simple power loading solution to minimize the bit error probability at a fixed rate. Lastly, we show comparative simulation results that corroborate the arguments presented in this paper.

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Section: System Model and Preliminariesmentioning

confidence: 98%

“…Some authors have optimized the transmitter power allocation with intent to maximize the capacity of the OFDM system. In [6], the authors maximize the throughput of OFDM at a fixed packet error rate. Power loading has also been considered for coded OFDM systems.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Modulation for Limited Diversity Fading Channels

Nagaraj

Sarkar

2009

2009 IEEE 70th Vehicular Technology Conference Fall

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“…The instantaneous capacity in bits per complex dimension of an N tone BICM-OFDM system in a frequencyselective quasi-static channel is given in [26] (by extending the results of [6]) as…”

Section: Without Bit-loadingmentioning

confidence: 99%

Performance Analysis and Enhancement of Multiband OFDM for UWB Communications

Snow¹,

Lampe²,

Schober³

2007

IEEE Trans. Wireless Commun.

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-In this paper, we analyze the frequency-hopping orthogonal frequency-division multiplexing (OFDM) system known as Multiband OFDM for high-rate wireless personal area networks (WPANs) based on ultra-wideband (UWB) transmission. Besides considering the standard, we also propose and study system performance enhancements through the application of Turbo and Repeat-Accumulate (RA) codes, as well as OFDM bit-loading. Our methodology consists of (a) a study of the channel model developed under IEEE 802.15 for UWB from a frequency-domain perspective suited for OFDM transmission, (b) development and quantification of appropriate information-theoretic performance measures, (c) comparison of these measures with simulation results for the Multiband OFDM standard proposal as well as our proposed extensions, and (d) the consideration of the influence of practical, imperfect channel estimation on the performance. We find that the current Multiband OFDM standard sufficiently exploits the frequency selectivity of the UWB channel, and that the system performs in the vicinity of the channel cutoff rate. Turbo codes and a reduced-complexity clustered bit-loading algorithm improve the system power efficiency by over 6 dB at a data rate of 480 Mbps.

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“…The information theoretic analysis of BICM in quasi-static frequency selective fading in terms of outage information measures (capacity and cut-off rate) is discussed in [4]. Li and Sun compared the error performance of TCM schemes designed under various criteria and that of BICM in indoor WLAN channel environments through numerical experiments.…”

Section: Introductionmentioning

confidence: 99%

On the code-diversity performance of bit-interleaved coded OFDM in frequency-selective fading channels

Song

Mujtaba²

2003

2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484)

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The IEEE 802.11a OFDM Wireless local area network (WLAN) system aims to achieve code diversity in quasi-static frequency-selective fading channels by employing bit interleaved coded modulation (BICM). Since the time variation of the channel during a WLAN packet transmission is small and its frequency selectivity finite, the code diversity is limited by both the degree of the channel variation as well as by the code properties. This paper experimentally investigates the impact of channel frequency selectivity on the code-diversity performance of BICM, with and without 2×1 Alamouti transmit diversity. Using a simplified model of the finite frequency selectivity, we develop a mathematical framework to show that the code diversity is only probabilistically achieved. Our results indicate that for the frequency selectivity typically seen in indoor WLAN channels, using a channel code with larger d free does not improve the packet error rate (PER) performance. 0-7803-7954-3/03/$17.00 ©2003 IEEE.

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Outage Capacity and Cutoff Rate of Bit-Interleaved Coded OFDM under Quasi-Static Frequency Selective Fading

Cited by 15 publications

References 7 publications

Adaptive Modulation for Limited Diversity Fading Channels

Adaptive Modulation for Limited Diversity Fading Channels

Performance Analysis and Enhancement of Multiband OFDM for UWB Communications

On the code-diversity performance of bit-interleaved coded OFDM in frequency-selective fading channels

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