Wireless Communications and Mobile Computing

Cover image for Vol. 13 Issue 1

January 2013

Volume 13, Issue 1

Pages i–ii, 1–94

  1. Issue Information

    1. Top of page
    2. Issue Information
    3. Research Articles
  2. Research Articles

    1. Top of page
    2. Issue Information
    3. Research Articles
    1. A study on one-dimensional k-coverage problem in wireless sensor networks (pages 1–11)

      Lei Li, Baoxian Zhang and Jun Zheng

      Version of Record online: 24 JAN 2011 | DOI: 10.1002/wcm.1087

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      This paper studies the one-dimensional coverage problem in wireless sensor networks. It analyzes three important parameters related to a one-dimensional sensor network, i.e., expected k-coverage proportion, full k-coverage probability, and partial k-coverage probability, and derives mathematical models that describe the relationships between these parameters and the node density in the network. The results obtained are useful to calculate or estimate the node density required for achieving a given coverage probability in the deployment of a one-dimensional sensor network for many applications.

    2. Dynamic fractional frequency reuse (D-FFR) for multicell OFDMA networks using a graph framework (pages 12–27)

      Ronald Y. Chang, Zhifeng Tao, Jinyun Zhang and C.-C. Jay Kuo

      Version of Record online: 18 JAN 2011 | DOI: 10.1002/wcm.1088

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      In this paper, a graph-based framework is proposed to implement dynamic fractional frequency reuse (D-FFR) in a multicell Orthogonal Frequency Division Multiple Access (OFDMA) network. Various versions of FFR can easily be incorporated in the framework to yield dynamic realizations. The proposed D-FFR scheme demonstrates significant performance improvement over conventional FFR and previous interference management schemes in terms of cell throughput and service rate.

    3. MVDR-combining-aided diversity and spatial multiplexing for MIMO multi-cellular networks with cochannel interference (pages 28–36)

      Jui Teng Wang

      Version of Record online: 18 JAN 2011 | DOI: 10.1002/wcm.1090

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      Two multiple-input multiple-output (MIMO) schemes (a diversity scheme and a spatial multiplexing scheme) that employ the minimum variance distortionless response (MVDR) combining are proposed for multi-cellular networks with cochannel interference.

    4. Sequential frequency reuse with power control for OFDMA systems (pages 37–46)

      Bumkwi Choi, Seyoun Lim and Tae-Jin Lee

      Version of Record online: 1 FEB 2011 | DOI: 10.1002/wcm.1093

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      We propose a sequential frequency reuse (SqFR) with power control for OFDMA systems. The proposed SqFR utilizes the whole frequency bandwidth and can avoid serious ICIs from neighboring cells by providing cell-specific sub-channel allocation to each cell. In addition, by giving more power to sub-carriers for cell-edge users, one can increase carrier-to-interference-plus-noise ratio (CINR) of cell-edge users.

    5. A lightweight, self-adaptive lock gate designation scheme for data collection in long-thin wireless sensor networks (pages 47–62)

      You-Chiun Wang, Che-Hsi Chuang, Yu-Chee Tseng and Chien-Chung Shen

      Version of Record online: 18 JAN 2011 | DOI: 10.1002/wcm.1094

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      This paper proposes a lightweight, self-adaptive scheme that designates multiple lock gates along a long-thin sensor network to collect data from sensor nodes. The proposed scheme balances between the responsiveness and the congestion of data collection while mitigating the funneling effect. A testbed of 100 Jennic sensor nodes is developed to demonstrate the effectiveness of the scheme.

    6. Pre-filtering technique for MAI cancellation in MC-CDMA systems (pages 63–71)

      Tain-Sao Chang, Cherng-Chang Yen, Ya-Yin Yang and Jyh-Horng Wen

      Version of Record online: 18 JAN 2011 | DOI: 10.1002/wcm.1095

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      In this paper, we propose a pre-filtering-based MC-CDMA system which uses a pre-filtering technique at the transmitter and an equal gain combining (EGC) scheme at the receivers, respectively, to eliminate the multiple access interference (MAI). Our proposed pre-filtering technique transforms the transmitted signals so that the MAI can be eliminated, and the EGC scheme weights the signals received from all subcarriers so that channel distortions can be compensated.

    7. Performance evaluation of MIMO–WCDMA cellular networks in multiuser frequency selective fading environments (pages 72–84)

      P. K. Gkonis, G. V. Tsoulos and D. I. Kaklamani

      Version of Record online: 18 JAN 2011 | DOI: 10.1002/wcm.1096

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      A maximization of signal to jamming plus noise ratio strategy (MSJNR) is proposed that can provide up to 30% BER gain compared to the maximization of signal to noise ratio (MSNR) strategy for high data rate services. This gain can be further improved by 25% with the proposed adjacent sector cooperation strategy which can be feasible in the currently deployed networks, as cooperation of only three sectors is required.

    8. A generalisation of the Rayleigh distribution with applications in wireless fading channels (pages 85–94)

      E. Gómez-Déniz and L. Gómez-Déniz

      Version of Record online: 8 FEB 2011 | DOI: 10.1002/wcm.1097

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      Fading-shadowing effects in wireless channels are usually modelled by the Rayleigh-Lognormal distribution (RL). The K-distribution (K) is similar to RL but, parameter estimates are not direct. Another approach is the Rayleigh-inverse Gaussian distribution (RIG). In this paper, a generalization of the Rayleigh distribution, which is simpler than the RL, K and RIG distributions, is presented. The new distribution seems more suitable for the design of contemporary wireless communication systems. Results based on statistically distance measurements validate the new distribution.