Performance analysis and modeling of errors and losses over 802.11b LANs for high-bit-rate real-time multimedia

Khayam, Syed Ali; Karande, Shirish; Radha, Hayder; Loguinov, Dmitri

doi:10.1016/s0923-5965(03)00053-5

Cited by 72 publications

(108 citation statements)

References 15 publications

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“…We use the 802.11b MAC layer bit-error traces collected in [2] to simulate the wireless channel. These biterror traces were collected at three supported data rates -2 Mbps, 5.5 Mbps, and 11 Mbps -of an operational 802.11b wireless LAN under realistic settings.…”

Section: Methodsmentioning

confidence: 99%

“…Specifically, the traces were collected by positioning the access point and the clients in separate rooms in order to simulate a realistic business/classroom/home-network wireless setup. It was highlighted in [2] that the robustness at the physical layer decreases with an increase in data rate, and consequently more errors are propagated to the MAC layer. For the traces used in this paper, the average bit-error rates are 0.032%, 0.31%, and 5% at 2, 5.5, and 11 Mbps, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Equation (2) measures the probability that the observed (corrupted) CHF value is W given that the transmitted (correct) CHF was X i . By plugging (2) in (1) we can evaluate the a posteriori distribution on which different detectors can be applied. In essence, once the a posteriori distribution has been computed, the header detection problem translates into the well-known decision theoretic problem of detecting known parameters in noise [5].…”

Section: B Generation Of a Posteriori Distributionmentioning

confidence: 99%

“…It has been shown that such a strategy results in better throughput and lesser delay than the traditional retransmission-based recovery. In many recent cross-layer studies [2]- [4], partial protocol checksums are used to cover only the headers, while ignoring payload/data errors.…”

Section: Introductionmentioning

confidence: 99%

“…These packets are dropped by contemporary cross-layer multimedia schemes [2]- [4]. Moreover, support for a partial checksum requires modifications to multimedia transmitters, receivers, and intermediate nodes.…”

Section: Introductionmentioning

confidence: 99%

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Improving Wireless Multimedia Quality using Header Detection with Priors

Khayam

Karande

Ilyas

et al. 2006

2006 IEEE International Conference on Communications

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Abstract-Recent wireless multimedia studies have revealed that forward error correction (FEC) on corrupted packets yields better bandwidth utilization and lesser delay than retransmissions. To facilitate FEC decoding at a wireless receiver, it is desirable to relay maximum number of (error-free and corrupted) packets to the receiver's application layer. To that end, most cross-layer multimedia schemes perform partial checksum only on packet headers. However, even with a partial checksum, bursty wireless errors introduce frequent header corruptions, thereby causing considerable packet drops. In this paper, we extend our work in [1], which proposed receiver-based schemes to correct a packet's critical (and corrupted) header fields. This paper: (a) poses header detection as the well-known decision theoretic problem of detecting known parameters in noise, (b) evaluates two detectors using bit-error traces collected over an 802.11b network, (c) provides throughput results for the detectors, and (d) uses video in conjunction with FEC as an example to highlight the efficacy of the proposed schemes. We show that header detection provides significant improvements in throughput and video quality over the conventional UDP/IP protocol stack.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: B Generation Of a Posteriori Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improving Wireless Multimedia Quality using Header Detection with Priors

Khayam

Karande

Ilyas

et al. 2006

2006 IEEE International Conference on Communications

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An adaptive multi‐hop forward error correction protection scheme for video streaming over wireless mesh networks

Tsai

Shieh

Hwang

et al. 2009

Int J Communication

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SUMMARYTraditional forward error correction (FEC) mechanisms can be divided into end-to-end FEC protection schemes and hop-by-hop FEC protection schemes. The end-to-end FEC protection schemes over-allocate FEC redundancy to each link and may induce a self-congestion effect in a link. The hop-by-hop FEC protection scheme incurs a long end-to-end delay that harms the video performance at the video receiver. Accordingly, the Adaptive Multi-Hop FEC (AM-FEC) protection scheme is proposed in this paper to improve the quality of video streaming data over Wireless Mesh Networks by means of simultaneously minimizing the end-to-end delay and reducing the FEC computational cost. The AM-FEC protection scheme uses a heuristic algorithm to minimize the number of FEC-encoded segments between the video sender and receiver. Moreover, according to the decodable frame rate the AM-FEC protection scheme can dynamically adjust FEC redundancy on each link to outperform end-to-end FEC protection schemes and hop-by-hop FEC protection schemes. In the experiments, the AM-FEC protection scheme achieves timely loss recovery for delay-sensitive video streaming and outperforms traditional FEC protection schemes in terms of video peak signal-to-noise ratio.

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Error‐aware and energy‐efficient routing approach in MANETs

Tan

Yang

Chan

2008

Int J Communication

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SUMMARYThe lifetime of a network is the key design factor of mobile ad hoc networks (MANETs). To prolong the lifetime of MANETs, one is forced to attain a tradeoff of minimizing the energy consumption and load balancing. In MANETs, energy waste resulting from retransmission due to high bit error rate (BER) and high frame error rate (FER) of wireless channel is significant. In this paper, we propose two novel protocols termed multi-threshold routing protocol (MTRP) and enhanced multi-threshold routing protocol (EMTRP). MTRP divides the total energy of a wireless node into multiple ranges. The lower bound of each range corresponds to a threshold. The protocol iterates from the highest threshold to the lowest one and chooses those routes with bottleneck energy being larger than the current threshold during each iteration. This approach thus avoids overusing certain routes and achieves load balancing. If multiple routes satisfy the threshold constraint, MTRP selects a route with the smallest hop count to further attain energy efficiency. Based on MTRP, EMTRP further takes channel condition into consideration and selects routes with better channel condition and consequently reduces the number of retransmissions and saves energy. We analyze the average loss probability (ALP) of the uniform error model and Gilbert error model and give a distributed algorithm to obtain the maximal ALP along a route. Descriptions of MTRP and EMTRP are given in pseudocode form. Simulation results demonstrate that our proposed EMTRP outperforms the representative protocol CMMBCR in terms of total energy consumption and load balancing.

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Performance analysis and modeling of errors and losses over 802.11b LANs for high-bit-rate real-time multimedia

Cited by 72 publications

References 15 publications

Improving Wireless Multimedia Quality using Header Detection with Priors

Improving Wireless Multimedia Quality using Header Detection with Priors

An adaptive multi‐hop forward error correction protection scheme for video streaming over wireless mesh networks

Error‐aware and energy‐efficient routing approach in MANETs

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