Wireless Communications and Mobile Computing

Cover image for Wireless Communications and Mobile Computing

August 2010

Volume 10, Issue 8

Pages 1017–1158

  1. Research Articles

    1. Top of page
    2. Research Articles
    1. A network coding based interference cancelation scheme for wireless ad hoc networks (pages 1017–1032)

      Chen Chen, Lin Bai, Kai Cai, Jianhua He and Haige Xiang

      Version of Record online: 16 JUN 2009 | DOI: 10.1002/wcm.817

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      In this paper, we treat the interfered signals from a new perspective on the basis of additive electromagnetic waves and propose a network coding based interference cancelation (NCIC) scheme. In the proposed scheme, adjacent nodes can transmit simultaneously with careful scheduling; therefore, network performance will not be limited by the multiple access interference. In addition, we proposed a space segmentation method to help the scheduling scheme achieve better scalability and reduce its complexity for random and complex ad hoc network topologies.

    2. Radio access technology recognition by classification of low temporal resolution power spectrum measurements (pages 1033–1044)

      L. Gueguen and B. Sayrac

      Version of Record online: 15 JUL 2009 | DOI: 10.1002/wcm.818

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      In this paper, a machine learning approach is proposed for automatic recognition of the radio access technology (RAT) based on supervised classification of spectrum power measurements in a cognitive radio context. Recognition of the active local RATs allows the cognitive terminal to make informed decisions on which wireless technology to camp, and to adapt its transmission to the wireless environment. To this end, supervised classification of signals obtained from wide band spectrum power measurements with low temporal resolution is carried out.

    3. Sensor network localization using kernel spectral regression (pages 1045–1054)

      Chengqun Wang, Jiming Chen and Youxian Sun

      Version of Record online: 23 JUN 2009 | DOI: 10.1002/wcm.820

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      We addresses the localization problem in wireless sensor networks using signal strength, use a kernel function to measure the similarities between sensor nodes and kernel spectral regression (KSR) method to estimate the relative locations of the sensor nodes. Simulation results show that KSR can achieve small average location error with a small number of anchors. We also compare our method with several related methods, and the results show that KSR is more efficient than the others in the simulation.

    4. Cross-layer design for MIMO systems over spatially correlated and keyhole Nakagami-m fading channels (pages 1055–1067)

      Jian Qi, Sonia Aïssa and Amine Maaref

      Version of Record online: 6 JUL 2009 | DOI: 10.1002/wcm.822

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      A cross-layer design combining physical-layer adaptive modulation and link-layer truncated automatic repeat request protocol is proposed for multiple-input multiple-output (MIMO) systems, the performance of which is evaluated in terms of average spectral efficiency, average packet loss rate, and outage probability, in Nakagami-m fading channels that are either spatially correlated or exhibit the keyhole phenomenon. Owing to this framework, the impact of important design parameters, such as maximum number of retransmissions, MIMO configuration, Nakagami-m index, and spatial fading correlation, are revealed.

    5. Cross-level PRC transmitter for TH-PAM UWB systems (pages 1068–1077)

      Wenkun Wen, Yuanping Zhou and Minghua Xia

      Version of Record online: 15 JUL 2009 | DOI: 10.1002/wcm.823

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      A two-stage cross-level pre-RAKE combining (CL-PRC) scheme for time hopping pulse amplitude modulation ultra wideband (TH-PAM UWB) transmitter is proposed in this paper. Unlike the conventional PRC schemes that suppress all the chip-wise interference, the proposed scheme suppresses only the specific frame-wise inter-symbol interference (ISI) by exploiting the characteristic that the information bits are transmitted only at ultra short time slots. This results in a low complexity pre-equalizer with improved bit error rate (BER) performance.

    6. A frequency-aware data-centric mechanism for wireless sensor networks (pages 1078–1101)

      Chih-Yung Chang, Jang-Ping Sheu, Sheng-Wen Chang and Yu-Chieh Chen

      Version of Record online: 15 JUL 2009 | DOI: 10.1002/wcm.824

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      The proposed dynamic data-centric routing and storage mechanism (DDCRS) considers multiple sinks with different query frequencies. DDCRS dynamically changes the locations of data-centric nodes and constructs shared paths from data-centric node to multiple sinks for energy conservation.

    7. Multi-group linear turbo equalization with intercell interference cancellation for MC-CDMA cellular systems (pages 1102–1112)

      Huan X. Nguyen, Jinho Choi, Seong Rag Kim and Junyoung Nam

      Version of Record online: 6 JUL 2009 | DOI: 10.1002/wcm.825

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      The paper investigates multi-group linear turbo equalization which uses single antenna interference cancellation technique to mitigate intercell interference for multi-carrier code division multiple access cellular systems. The complexity of the receiver is low as the one-tap minimum mean square error equalizer is employed for mitigating intracell interference, while a simple group interference canceller is used for suppressing intercell interference. Simulation results show that the proposed iterative receiver can mitigate the intercell interference effectively for both uncoded and coded signals.

    8. Study on bandwidth control for multiple transmission rates in IEEE 802.11e EDCAF (pages 1113–1127)

      Bih-Hwang Lee and Hui-Cheng Lai

      Version of Record online: 30 JUL 2009 | DOI: 10.1002/wcm.827

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      IEEE 802.11e supports the guaranteed quality of service (QoS) by providing different transmission priorities. Signal quality may affect the available bandwidth and transmission rate, because the characteristic of communication channel in wireless environment is in random time-variation manner. We propose a bandwidth control scheme (BCS) by combining the IEEE 802.11e EDCAF protocol to overcome the guaranteed bandwidth issue in multirate environments. A multirate discrete Markov chain model is analyzed for the multirate transmission system in this paper.

    9. Circumventing security toolbars and phishing filters via rogue wireless access points (pages 1128–1139)

      Saeed Abu-Nimeh and Suku Nair

      Version of Record online: 6 JUL 2009 | DOI: 10.1002/wcm.829

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      A rogue wireless access point is set up and poisoned DNS cache entries are used in a local DNS poisoning attack to bypass five well-known security toolbars and three reputable browser built-in phishing filters.

    10. Throughput improvement and its tradeoff with the queuing delay in the diamond relay networks (pages 1140–1158)

      Qing Wang, Pingyi Fan and K. B. Letaief

      Version of Record online: 30 JUL 2009 | DOI: 10.1002/wcm.830

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      We put forward a new processing strategy in which buffers are employed at both relays in SRP mode. Theoretical analysis have shown that the throughput can be greatly improved at a cost of queuing delay by using this developed scheme. We also consider the tradeoff between the throughput and the additional queuing delay in theory.