Diversity and packet combining in Rayleigh fading channels

Chakraborty, Shyam; Liinaharja, Markku; Ruttik, Kalle

doi:10.1049/ip-com:20040549

Cited by 16 publications

(11 citation statements)

References 6 publications

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“…A proposal that uses 802.11's request-to-send(RTS)/clearto-send(CTS) control packets to convey the results of packet combining is outlined in [14]. Because RTS/CTS is required for every transmission, the proposed method (which was not implemented and experimentally evaluated) will produce much higher overhead than our RFA protocol.…”

Section: Related Workmentioning

confidence: 97%

“…[23] presents simulated results based on a capture model but ignores protocol level issues such as ARQ. The contributions of [14,24,39] focus on theoretical performance analysis, with [39] presenting results in the context of a WLAN based on Bluetooth [11] radios. In contrast, our contributions lie in the design of a macrodiversity system that works well in CSMA-based WLANs and in conducting a performance study of a fully implemented receiver macrodiversity system on a real testbed.…”

Section: Related Workmentioning

confidence: 99%

“…The idea of recovering a frame by combining it with a retransmitted version was first proposed in [35] and then further analyzed in [14,15]. Hybrid ARQ is an extension of this technique, which combines forward error correction (FEC) and retransmission to recover unsuccessful transmissions [25].…”

Section: Related Workmentioning

confidence: 99%

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Multi-radio diversity in wireless networks

Miu¹,

Balakrishnan²,

Köksal³

2006

Wireless Netw

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This paper describes the Multi-Radio Diversity (MRD) wireless system, which uses path diversity to improve loss resilience in wireless local area networks (WLANs). MRD coordinates wireless receptions among multiple radios to improve loss resilience in the face of path-dependent frame corruption over the radio. MRD incorporates two techniques to recover from bit errors and lower the loss rates observed by higher layers, without consuming much extra bandwidth. The first technique is frame combining, in which multiple, possibly erroneous, copies of a given frame are combined together in an attempt to recover the frame without retransmission. The second technique is a low-overhead retransmission scheme called request-for-acknowledgment (RFA), which operates above the link layer and below the network layer to attempt to recover from frame combining failures. We present an analysis that determines how the parameters for these algorithms should be chosen.We have designed and implemented MRD as a fully functional WLAN infrastructure based on 802.11a. We evaluate the MRD system under several different physical configurations, using both UDP and TCP, and measured throughput gains up to 3× over single radio communication schemes employing 802.11's autorate adaptation scheme.

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Section: Related Workmentioning

confidence: 97%

Section: Related Workmentioning

confidence: 99%

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Multi-radio diversity in wireless networks

Miu¹,

Balakrishnan²,

Köksal³

2006

Wireless Netw

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“…The reason is that the distribution of error-bits is not uniform. To simplify the estimation of BER performance, a BPSK scheme over AWGN channel can be applied for upload/download transmission [13]. In this case, the bit error probability in an AWGN channel with the SNR equal to E b /N 0 is given by [10] …”

Section: The Channel Performancementioning

confidence: 99%

“…However, its performance is evaluated under the assumption of continuous branch selection. Thereby, many schemes [9,11,13,14] have been proposed to provide significant power gains over existing selection diversity schemes in Rayleigh fading channels. [15], for example, has introduced that in very slow fading channels, the dual-branch switched diversity scheme at the transmitter also can improve the throughput efficiency of the ARQ protocol significantly.…”

Section: Introductionmentioning

confidence: 99%

Performance of dual-branch diversity receiver based SR-ARQ in Rayleigh fading channel

Al–Suhail

Lamahewa

Kennedy

2009

2009 3rd International Conference on Signal Processing and Communication Systems

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Automatic repeat request (ARQ) schemes are quite effective for improving the throughput of system diversity in time-varying channel environments. In this paper, a dual-branch selection diversity receiver based selective repeat-ARQ scheme is investigated to evaluate the optimal throughput performance in terms of the average bit error rate in Rayleigh fading channels. Both uncorrelated and correlated antenna branches are considered. The numerical results shows the effect of optimal switching threshold on the throughput performance in case of switched diversity as well as the mobility effect of the selection combining diversity receiver when correlated antenna branches are present. A significant improvement in the system throughput of selection diversity outperforms that of switched diversity.

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