Selective bit-error checking at the MAC layer for voice over mobile ad hoc networks with IEEE 802.11

Dong, Hui; Chakares, I.D.; Gersho, A.; Belding-Royer, Elizabeth M.; Gibson, J.D.

doi:10.1109/wcnc.2004.1311366

Cited by 22 publications

(10 citation statements)

References 15 publications

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“…We also plan to continue examination of the effect of allowing bit errors in multi-hop IEEE 802.11 networks [27]. Additionally, we will examine advanced encoding and decoding techniques to conceal bit errors.…”

Section: Discussionmentioning

confidence: 99%

Allowing errors in speech over wireless LANs

Chakeres¹,

Dong²,

Belding-Royer³

et al. 2004

2004 4th Workshop on Applications and Services in Wireless Networks, 2004. ASWN 2004.

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Abstract-Wireless LANs are becoming commonplace because of their ease in providing mobile communication. As use of IEEE 802.11 continues to expand, support for voice will become a desirable feature. Supporting voice conversations over a packet network is more challenging than over current circuit switched wired networks. These challenges are particularly difficult due to the erroneous nature of a wireless channel. When errors occur in data packets the IEEE 802.11 MAC layer standard requires that the receiver not accept the packet; the source must retransmit all packets received with errors. However, digitized voice data can tolerate some error and loss without noticeable degradation in call quality. By forcing error-free reception of speech, scarce bandwidth and energy are unnecessarily expended, and the delay of the packets increases. In this paper we explore allowing bit errors in voice packets over IEEE 802.11 networks. We propose two strategies for allowing these errors and demonstrate that they both result in improved performance.

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Section: Discussionmentioning

confidence: 99%

Allowing errors in speech over wireless LANs

Chakeres¹,

Dong²,

Belding-Royer³

et al. 2004

2004 4th Workshop on Applications and Services in Wireless Networks, 2004. ASWN 2004.

Self Cite

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“…Dynamic Source Routing (DSR) [4] and the Ad hoc On-demand Distance Vector (AODV) protocols are the best examples for single path routing protocol. Nevertheless, these protocols are unable of load balancing the traffic.…”

Section: Single Path Routing Protocolmentioning

confidence: 99%

Multipath Routing Protocol for Reducing Congestion and Delay in MANET

PratapaReddy¹,

Satyanarayana²

2013

IJCA

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In this paper, a congestion aware multipath routing protocol in mobile ad hoc networks (MANET) is proposed. The paths which have better bandwidth will be initially selected. For selected paths, first the congestion status of the node is found by using the early congestion detection technique which is based on the queue status and data arrival rate of the nodes. The delay includes weighted channel delay and buffer queuing delay. The paths which have better bandwidth will be initially selected. . If the congestion status is lower than the threshold value, the packets are sent direcrly through the path. If it is more than the threshold value, a congestion aware routing is initiated. In this congestion aware routing, routes having less end-to-end delay will be selected from the backup routes, so that they have low congestion. Simulation results show that the proposed protocol reduces the end-to-end delay and increases the packet delivery ratio.

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“…Mobile adhoc network (MANET) represents a set of wireless mobile nodes that have the capability of communicating with each other without the help of a preexisting infrastructure [1]. Power consumption is an important issue in MANETs due to high dependence of mobile devices on battery power.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of wireless mobile adhoc networks through improved error correction and ICI cancellation

Sabir

Babar

Shah

2012

EURASIP J. Adv. Signal Process.

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Mobile adhoc network (MANET) refers to an arrangement of wireless mobile nodes that have the tendency of dynamically and freely self-organizing into temporary and arbitrary network topologies. Orthogonal frequency division multiplexing (OFDM) is the foremost choice for MANET system designers at the Physical Layer due to its inherent property of high data rate transmission that corresponds to its lofty spectrum efficiency. The downside of OFDM includes its sensitivity to synchronization errors (frequency offsets and symbol time). Most of the present day techniques employing OFDM for data transmission support mobility as one of the primary features. This mobility causes small frequency offsets due to the production of Doppler frequencies. It results in intercarrier interference (ICI) which degrades the signal quality due to a crosstalk between the subcarriers of OFDM symbol. An efficient frequency-domain block-type pilot-assisted ICI mitigation scheme is proposed in this article which nullifies the effect of channel frequency offsets from the received OFDM symbols. Second problem addressed in this article is the noise effect induced by different sources into the received symbol increasing its bit error rate and making it unsuitable for many applications. Forward-error-correcting turbo codes have been employed into the proposed model which adds redundant bits into the system which are later used for error detection and correction purpose. At the receiver end, maximum a posteriori (MAP) decoding algorithm is implemented using two component MAP decoders. These decoders tend to exchange interleaved extrinsic soft information among each other in the form of log likelihood ratio improving the previous estimate regarding the decoded bit in each iteration.

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Selective bit-error checking at the MAC layer for voice over mobile ad hoc networks with IEEE 802.11

Cited by 22 publications

References 15 publications

Allowing errors in speech over wireless LANs

Allowing errors in speech over wireless LANs

Multipath Routing Protocol for Reducing Congestion and Delay in MANET

Performance enhancement of wireless mobile adhoc networks through improved error correction and ICI cancellation

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