Implementing Cooperative Wireless Networks

Valentin, Stefan; Lichte, Hermann S.; Karl, Holger; Simoens, S.; Vivier, Guillaume; Vidal, Josep; Agustín, Adrián

doi:10.1007/978-1-4020-5979-7_8

Cited by 10 publications

(7 citation statements)

References 26 publications

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“…We call CoopMAC a sender-initiated protocol because the source decides whether to cooperate and with whom. Reference [28] compares all three flavors of protocols, namely sender-initiated, destination-initiated, and partner-initiated protocols. Here, the extended RTS packets also carry the data rate estimated by the source.…”

Section: Integrating Cooperative Relaying Into Wlans -The Coopmac Appmentioning

confidence: 99%

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Cooperative Wireless Networking Beyond Store-and-Forward

Valentin

Lichte

Karl

et al. 2007

Wireless Pers Commun

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Abstract. In future wireless networks devices may cooperate to form logical links. Each of these links may consist of several independent physical channels which are shared by the cooperating partners. Even without multiple antennas this cooperation provides diversity in time and space. This so-called cooperation diversity increases the robustness of the link vs. fading and interference. After surveying approaches in cooperation diversity we focus on optimizing its performance by combining several cooperation schemes and by integrating cooperation into space-time coding. For multiple scenarios, we further discuss the factors and benefits introduced by user cooperation and how cooperation-aware resource allocation can be employed to further increase the performance of cooperative networks. When it comes to implementation, the question arises how cooperation can be integrated efficiently into existing wireless networks. A case study for 802.11-based WLANs reveals the issues that need to be solved in order to deploy cooperative techniques. We provide an overview of the state of the art in implementing cooperation approaches, analyze how appropriate these approaches solve the issues, and, where appropriate, point out their deficiencies. We conclude with a road map for future research necessary to tackle these deficiencies for the practical implementation of cooperation in next generation mesh, WLAN, WMAN, and cellular standards.

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Section: Integrating Cooperative Relaying Into Wlans -The Coopmac Appmentioning

confidence: 99%

“…source or destination select the partner, or decentralized, i.e. the partners coordinate among themselves who cooperates [28]. Several factors determine partner selection, where the states of the inter-user and the uplink channel are most relevant.…”

Section: Partner Selectionmentioning

confidence: 99%

Cooperative Wireless Networking Beyond Store-and-Forward

Valentin

Lichte

Karl

et al. 2007

Wireless Pers Commun

Self Cite

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“…Control signalling for practical cooperation schemes have also been proposed in [22][23][24][25][26][27][28]. In our proposed scheme, we presume that the primary system is an advanced system with a relaying functionality, like IEEE 802.16j [29], and it employs a practical handshake mechanism for cooperative relaying [27].…”

Section: Introductionmentioning

confidence: 99%

An orthogonal spectrum sharing scheme for wireless sensor networks

Ting

Han

Pandharipande

2011

J Wireless Com Network

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It is not economically viable to allocate a dedicated spectrum band to wireless sensor networks (WSNs). Moreover, sharing a spectrum band with incumbent (primary) system compromises the reliability and performance of both the systems due to interference from one system to another. In this article, we address this limitation by proposing a two-phase orthogonal spectrum sharing protocol for a WSN which exploits multiple sensor nodes to effectively cancel out the interference from a WSN to the primary system, and vice versa. As a consequence, it is possible to achieve spectrum access for the WSN without compromising on the performance of either systems. Performance of WSN as well as the primary system is quantified in terms of average received signal to noise ratio. We then validate the efficiency of the proposed scheme through analytical and simulation results.

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“…We also highlighted some of the major issues with the current testbeds. [94]. In our proposed scheme, we presume that the primary system is an advanced system with a relaying functionality, like IEEE 802.16j [95], and it employs a practical handshake mechanism for cooperative relaying [94].…”

Section: Discussionmentioning

confidence: 99%

Design and measurement results for cooperative spectrum sharing

Vivek

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Scarcity of radio spectrum and inherent inefficiency of current spectrum allocation policies have spurred much research for alternative spectrum access techniques giving birth to the notion of cognitive radios. Recently, cooperative spectrum sharing (CSS) where two wireless systems operate over the same spectrum band albeit with different priorities has been proposed as a viable framework for cognitive radio. The primary system, comprising of a primary transmitter (PT) and primary receiver (PR), supports the relaying functionality. The secondary system, comprising of a secondary transmitter (ST) and secondary receiver (SR), operates on a secondary basis with the guarantee that its operation does not affect the primary system performance. However, most of the proposed CSS protocols are interference limited and the performance of the systems are limited by the amount of interference from one system to another. Consequently, there is a inherent tradeoff between the achievable performance of the primary and secondary systems. In this thesis, we try to resolve the above issue by proposing an interference-free CSS protocol known as orthogonal spectrum sharing scheme (OSSS), which alleviates the interference from the primary system to secondary system. The performance of OSSS has been demonstrated through simulation and analytical results. Another issue related to CSS protocols is the lack of measurement results to demonstrate their performance in a realistic environment. Hence, how much performance enhancement CSS can bring in a real wireless environment is still an viii open question. We try to answer this question by designing and developing a testbed for proof-of-concept demonstration and performance assessment of CSS protocols. The testbed is programmed to follow the OFDM standards in IEEE 802.11a. The performance of the testbed has been validated by obtaining both quantitative as well as qualitative results. Quantitative results are obtained by measuring the packet error rates for both primary and secondary systems whereas qualitative results are shown by utilizing a CSS protocol to successfully transmit two different images from PT to PR and ST to SR respectively. The spectrum access probability for the secondary system is also measured. Apart from the above, we also provide a theoretical format to analytically evaluate the back-off required in a nonlinear HPA while operating an OFDM based communication system. Thus the HPA can be operated with sufficient back-off so that nonlinear distortions due to HPA will have minimal impact on the obtained measurement results. As shown later in this thesis, an improper selection of backoff has considerable impact on the end-to-end symbol error rate (SER) performance of an OFDM based communication system.

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Implementing Cooperative Wireless Networks

Cited by 10 publications

References 26 publications

Cooperative Wireless Networking Beyond Store-and-Forward

Cooperative Wireless Networking Beyond Store-and-Forward

An orthogonal spectrum sharing scheme for wireless sensor networks

Design and measurement results for cooperative spectrum sharing

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