Properties and performance of the IEEE 802.11b complementary-code-key signal sets

Pursley, M.B.; Royster, Thomas C.

doi:10.1109/tcomm.2009.02.060642

Cited by 16 publications

(6 citation statements)

References 30 publications

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“…We consider this version of the protocol since the analysis in [16], [17], directly provides the packet success rate; note that it is easy to incorporate other versions of 802.11 (a, g), by considering the appropriate modulation/encoding schemes. The packet success rate, ps, as a function of the expected value S of the SINR is:…”

Section: B Packet Success Ratementioning

confidence: 99%

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Trading off distortion for delay for video transmissions in wireless networks

Feng

Papageorgiou

Krishnamurthy

et al. 2013

2013 Proceedings IEEE INFOCOM

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The end-user experience in viewing a video depends on the distortion; however, also of importance is the delay experienced by the packets of the video flow since it impacts the timeliness of the information contained and the playback rate at the receiver. Unfortunately, these performance metrics are in conflict with each other in a wireless network. Packet losses can be minimized by perfectly avoiding interference by separating transmissions in time or frequency; however, this decreases the rate at which transmissions occur, and this increases delay. Relaxing the requirement for interference avoidance can lead to packet losses and thus increase distortion, but can decrease the delay for those packets that are delivered. In this paper, we investigate this trade-off between distortion and delay for video. To understand the trade-off between video quality and packet delay, we develop an analytical framework that accounts for characteristics of the network (e.g. interference, channel variations) and the video content (motion level), assuming as a basis, a simple channel access policy that provides flexibility in managing the interference in the network. We validate our model via extensive simulations. Surprisingly, we find that the trade-off depends on the specific features of the video flow: it is better to trade-off high delay for low distortion with fast motion video, but not with slow motion video. Specifically, for an increase in PSNR (a metric that quantifies distortion) from 20 to 25 dB, the penalty in terms of the increase in mean delay with fast motion video is 91 times that with slow motion video. Our simulation results further quantify the trade-offs in various scenarios.

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Section: B Packet Success Ratementioning

confidence: 99%

“…Equations (16) and (17) provide a mapping from the expected value of the SINR to the packet success rate ps.…”

Section: B Packet Success Ratementioning

confidence: 99%

Trading off distortion for delay for video transmissions in wireless networks

Feng

Papageorgiou

Krishnamurthy

et al. 2013

2013 Proceedings IEEE INFOCOM

View full text Add to dashboard Cite

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“…[12], [13] considers the performance of 11b rates outdoors, or in terms of bit-level error patterns [14], [15]. The recent article [16] provides an analysis for a modulation scheme, BOK, related to CCK in a AWGN channel, but no analytic method is available for CCK itself.…”

Section: Related Workmentioning

confidence: 99%

The 802.11g 11 Mb/s Rate is More Robust than 6 Mb/s

Huang

Malone

Duffy

2011

IEEE Trans. Wireless Commun.

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Abstract-The robustness to noise of the 802.11b/g 5.5 Mb/s and 11 Mb/s rates must be investigated experimentally as they cannot be predicted theoretically. In this paper we report on detailed outdoor and indoor measurements that lead us to the surprising conclusion that the 11 Mb/s 802.11g rate experiences fewer packet losses than the 6 Mb/s 802.11g rate at any given (symbol) SNR. This occurs due to the combination of modulation and physical layer coding schemes used by these rates and has serious implications for rate control algorithms. The practical implications of this, factoring in the interaction between packet loss and 802.11 MAC retries, is that 6 Mb/s is effectively redundant as a packet transmission rate if the 11 Mb/s rate is available.

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“…Over the past decades, different modulation schemes have been developed to increase the data rate supported in wireless networks. From a simple Amplitude Modulation to complicated Complementary Key Coding [16] and then to OFDM [18], this development has taken decades to come due to the complexity of intermingling signals. For instance, since the introduction of IEEE 802.11 WLAN, it took four years to just double the data rate from the release of 802.11b to 802.11g.…”

Section: IImentioning

confidence: 99%

Performance Tradeoff Study of Streaming Video among Vehicle

Lawal

Huang

Yang

2010

2010 IEEE 72nd Vehicular Technology Conference - Fall

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Video and image communications can assist in highway traffic control, accident avoidance and management as well as road congestion control and coordination. This paper studies video streaming over wireless medium among a cluster of vehicles in an ad-hoc network. Through intense tradeoff study, we investigate the issues encountered in building a robust system that would allow automobiles to effectively transmit multimedia information in an ad-hoc network with constantly changing wireless environments. Based on our OPNET simulation results, we offer some design guidelines for transmitting streaming video over a vehicular adhoc network. I. INTRODUCTIONAs the number of vehicles on the road increased over the years, the need for safety on our roads cannot be over emphasized. VANET (Vehicular Ad-hoc NETwork) is a cluster of transporters equipped to communicate with each other either in an ad-hoc way (without any existing infrastructure) or with a nearby Road Side Unit (RSU) [2]. VANET has become an increasingly interesting focus of researchers and the automobile industry because it can enhance safety on the roadways by allowing vehicles to communicate with one another to prevent unwanted situations, thus enhancing comfort and safety of road users.As a part of the AUTO21 research group, our aim is to enhance safety on the road by using video and image communication to assist drivers without taking driving control from them [1]. VANET faces some difficulties to handle adhoc communication both among cars [2] and with Road Side Unit (RSU). The constantly changing vehicular environment and ad-hoc nature (governed mostly by the physical topology of the road and the proximity of nearby vehicles) of VANET poses the need for a careful study. Furthermore, information being sent in this network has to be real-time. Retransmissions may not be allowed as the delay could cause a lot of loss (which unfortunately is expected for a mobile adhoc network as route discovery time is inevitable. The study of tradeoffs among different routing algorithms in WiMAX Ad hoc networks is shown in [12]. To obtain reasonable performance, RSUs have to be much simpler than WiMAX or LTE base stations, and every tier in the OSI model has to be optimized for this purpose. One must also understand the traffic patterns in order to find an effective distributed transport layer protocol suite for this purpose. Therefore, we shall first focus on the video and image traffic, not only for the reasons given earlier,

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Properties and performance of the IEEE 802.11b complementary-code-key signal sets

Cited by 16 publications

References 30 publications

Trading off distortion for delay for video transmissions in wireless networks

Trading off distortion for delay for video transmissions in wireless networks

The 802.11g 11 Mb/s Rate is More Robust than 6 Mb/s

Performance Tradeoff Study of Streaming Video among Vehicle

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