Temporal correlation of dynamic on-body area radio channel

Smith, David B.; Zhang, Andrew; Hanlen, Leif; Miniutti, Dino; Rodda, David; Gilbert, Ben

doi:10.1049/el.2009.2057

Cited by 44 publications

(39 citation statements)

References 5 publications

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“…We also note that the 15 ms round-robin transmission period is far less than the BAN channel coherence time, even for highly dynamic BAN channels [14] where it as least 30 ms, which means that we can effectively treat all communications …”

Section: Experimental Methodsmentioning

confidence: 99%

“…A block fading channel is assumed, where the T x − Rx channel gain h T xRx is constant over the length of the transmitted packet, based on the temporal stability of the BAN channel [14]. We assume constant transmit signal power E s over each packet from sensors and relays; and constant noise variance (zero-mean additive-white-Gaussian noise) across all devices (N 0 ); such that the relative performance of the decode-andforward communications depends on the effective combined channel gain, h C , as combined channel power |E s h C | = h C , and combined channel power h C N 0 .…”

Section: Receive Combining In Cooperative Scenarios a Decode-anmentioning

confidence: 99%

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Improved Switched Combining with cooperative diversity for wireless body area networks: Empirical analysis and theory

Smith

2014

2014 IEEE International Conference on Communications (ICC)

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An improved form for Switched Combining (SwC) with on-body cooperative communications is presented, particularly suited to the 'everyday' wireless body area network (BAN) wireless channel. Two and three-branch cooperative coherent SwC is analyzed theoretically and empirically and compared with cooperative coherent selection combining (SC), and a previous switched combining implementation. New expressions for outage probability and approximate switching rate are derived for the proposed SwC. Three locations for relays/hubs are considered, along with seven sensor locations, all using extensive on-body "open-access" channel measurements. The outage performance of SwC is not considerably degraded with respect to SC with large improvement over single-link communications, and significant improvement over the previous SwC. The benefit of the proposed SwC is shown as the two and three-branch switching rate for this SwC, is typically between 10% and 15% of that of SC. Further, compared to the previous switched combining method, there is only a small increase in switching rate at the same time as improved outage performance. The low switching rate here may allow for easier implementation in practical IEEE 802.15.6 BAN.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Receive Combining In Cooperative Scenarios a Decode-anmentioning

confidence: 99%

Improved Switched Combining with cooperative diversity for wireless body area networks: Empirical analysis and theory

Smith

2014

2014 IEEE International Conference on Communications (ICC)

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“…Due to the characteristics of channel stability [15] and channel reciprocity [14] for everyday WBAN, this data can be used as the intra-WBAN two-hop communication channel gain in the study of co-existence of multiple WBANs. It also allows to investigate the impact of different hub placements at chest, right and left hips respectively.…”

Section: Rx-hdmentioning

confidence: 99%

Cooperative body-area-communications: Enhancing coexistence without coordination between networks

Dong

Smith

2012

2012 IEEE 23rd International Symposium on Personal, Indoor and Mobile Radio Communications - (PIMRC)

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In this paper, coexistence of multiple mobile wireless body area networks (WBANs), where there is no coordination between WBANs, is investigated for the case where the WBAN-of-interest employs cooperative communications. A decode-and-forward protocol with two dual-hop links, two relays and selection combining (SC) at the hub (or gateway device) is chosen for the WBAN-of-interest. A suitable time-divisionmultiple-access (TDMA) scheme is used, enabling intra-network and inter-network operation, to allocate slots for each Tx/Rx link packet transmission. Realistic channel models are employed with various amounts of shadowing, small-scale fading and white noise introduced between WBANs. For the WBAN-ofinterest, many hours of measured channel gain data is employed to emulate the channel for this WBAN. It is found that the chosen cooperative communications provides significantly better co-channel interference mitigation than single-link star topology WBAN communications in a mobile, dynamic, scenario, hence the signal-to-interference-plus-noise ratio (SINR) for 10% outage probability at the hub is greatly improved by up-to 12 dB. It is also demonstrated that the location of the hub, given three typical locations, has significant impact on the performance of the cooperative WBAN communications.

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“…For example, several models [7,8,12] attempt to describe long-term first and second order statistics of the varying signal strength, but do not capture different short-term or mid-term temporal distributions. If experimental traces of channel signal strength are available, then researchers can use them to feed the simulation.…”

Section: Introductionmentioning

confidence: 99%

Effects of sensor-to-sensor link modeling on body area network simulations

Tselishchev

Boulis

2012

Proceedings of the 7th ACM Workshop on Performance Monitoring and Measurement of Heterogeneous Wireless and Wired Networks

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A typical Body Area Network (BAN) involves multiple onbody sensors exchanging information with a central gateway, forming a star topology network. The characterization of sensor-to-gateway wireless links is clearly important in simulation, as indicated by substantial research efforts to collect experimental traces and model them. Sensor-to-sensor links on the other hand, have received less attention, due to the fact that there is no immediate communication between sensors and, at the same time, it is expensive to collect experimental traces for all node combinations. Nevertheless, these links affect communication when contention-based access protocols are considered, therefore creating a modeling need. In this paper we investigate models for sensorto-sensor links, in simulation scenarios which employ two established communication standards, namely 802.15.4 and 802.15.6. These standards rely on a mix of CSMA and TDMA to enable wireless communication between sensors and the gateway. We show that sensor-to-sensor links are indeed important in simulation, and investigate the effect of different modeling approaches on application layer results and computational overhead. Moreover, we show the correspondence between two different modeling approaches and suggest the simpler one is sufficient to carry out simulation studies over a wide range of scenarios.

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Temporal correlation of dynamic on-body area radio channel

Cited by 44 publications

References 5 publications

Improved Switched Combining with cooperative diversity for wireless body area networks: Empirical analysis and theory

Improved Switched Combining with cooperative diversity for wireless body area networks: Empirical analysis and theory

Cooperative body-area-communications: Enhancing coexistence without coordination between networks

Effects of sensor-to-sensor link modeling on body area network simulations

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