Wireless Communications and Mobile Computing

Cover image for Vol. 10 Issue 11

November 2010

Volume 10, Issue 11

Pages 1391–1532, E1–E3

  1. Research Articles

    1. Top of page
    2. Research Articles
    3. Call for Papers
    1. Thorough protocol extensions for integrating DSR-based Mobile Ad Hoc Networks with the Internet (pages 1391–1408)

      Shuo Ding

      Version of Record online: 15 NOV 2010 | DOI: 10.1002/wcm.828

      Thumbnail image of graphical abstract

      Modifying existing reactive ad hoc routing protocols to support Internet routing operations is challenging. This paper contributes thorough protocol extensions for connecting DSR-based MANETs with the Internet (DSR-IE). DSR routing protocol is extended to effectively support External Route Discovery and External Route Maintenance functions. Mobile IP is utilized to manage seamless data services. In particular, a novel External Route Discovery scheme, Comprehensive External Route Judgment, (CERJ) is proposed. OPNET simulations demonstrate the implementability and effectiveness of the proposed schemes.

    2. Radio resource allocation for interference management in mobile broadband OFDMA based networks (pages 1409–1430)

      Ángela Hernández, Israel Guío and Antonio Valdovinos

      Version of Record online: 15 NOV 2010 | DOI: 10.1002/wcm.831

      Thumbnail image of graphical abstract

      This paper focuses on the inter-cell interference (ICI) management problem in the downlink channel for mobile broadband wireless OFDMA-based systems. This subject is addressed from the standpoint of different interrelated resource allocation mechanisms operating in multi-cell scenarios in order to exploit frequency and multi-user diversity. Several alternatives for mixed frequency and power ICI coordination schemes, fully integrated with several heuristic adaptive subcarrier and power allocation algorithms, have been proposed, and evaluated.

    3. Load balancing and its performance evaluation for layer 3 and IEEE 802.21 frameworks in PMIPv6-based wireless networks (pages 1431–1443)

      Mun-Suk Kim and SuKyoung Lee

      Version of Record online: 15 NOV 2010 | DOI: 10.1002/wcm.832

      Thumbnail image of graphical abstract

      In Proxy Mobile IPv6 (PMIPv6), a number of mobile nodes must be associated with a Mobile Access Gateway (MAG) and hence, the MAG can be easily overloaded. Therefore, in this paper, we propose a load balancing mechanism among the MAGs in the PMIPv6 network. We also discuss about using IEEE 802.21 Media Independent Handover (MIH) protocol in the load balancing to learn the load status at the candidate point of attachments (PoAs), in addition to the load status at the candidate MAGs.

    4. Uplink carrier frequency offset estimation for WiMAX OFDMA-based ranging (pages 1444–1458)

      Yonghua Lin, Da Fan, Qing Wang and Jianwen Chen

      Version of Record online: 15 NOV 2010 | DOI: 10.1002/wcm.833

      Thumbnail image of graphical abstract

      In this paper, we focus on the multi-user carrier frequency offset (CFO) estimation in both initial ranging and periodic ranging for wireless standard 802.16e. Two algorithms based on the correlation properties of pseudo noise (PN) sequences in time domain and frequency domain are proposed, respectively. Simulation results show that the proposed frequency domain cross-correlation method performs better than the proposed time-domain cross-correlation method, and is more robust to multi-user interference and residual timing offset.

    5. Performance study for HARQ–ARQ interaction of LTE (pages 1459–1469)

      Ching-Hsiang Chuang and Phone Lin

      Version of Record online: 15 NOV 2010 | DOI: 10.1002/wcm.834

      Thumbnail image of graphical abstract

      The 3GPP working group proposes the Long-Term Evolution (LTE) system as the 4G mobile communications technology. In this paper, we propose an analytical model to model the behavior of the HARQ-ARQ Interaction for the LTE system.

    6. Adaptive reference code-based MAI cancellation for DS-CDMA (pages 1470–1477)

      Jong Mook Won, Jung Soo Kim and W. M. Kim

      Version of Record online: 15 NOV 2010 | DOI: 10.1002/wcm.835

      Thumbnail image of graphical abstract

      Observation 2: (MAI Equation)

      For arbitrary integer equation image, primitive polynomial equation image, equation image, equation image and complex numbers: equation image, equation image, in reference to equation image, has the following properties:

      • 1.1
        equation image.
      • 1.2
        equation image.
      • 1.3
        equation image.

      In Observation 1.1: equation image. Observation 1.2 follows from Observation 1.1 by setting equation image.

      Observation 2: (MAI Performance of equation image)

      • 2.1
        equation image if and if only equation image
      • 2.2
        equation image is minimized with equation image

      Proof. The above propositions are easily proved by noting that equation image is a decreasing function.

    7. A new subspace method for blind estimation of selective MIMO-STBC channels (pages 1478–1492)

      Javier Vía, Ignacio Santamaría, Jesús Pérez and Luis Vielva

      Version of Record online: 15 NOV 2010 | DOI: 10.1002/wcm.837

      Thumbnail image of graphical abstract

      A new technique for blind estimation of selective MIMO channels is presented. The method exploits the structure introduced by the channel and the STBC to recover the channel. The proposed technique can be applied in many practical STBC-based scenarios, such as STBC-OFDM, space-frequency block coding (SFBC), time-reversal STBC, and time-varying STBC encoded systems. Unlike other previous approaches, the proposed method is able to work with a small number of available STBC blocks, and its computational complexity increases only linearly with the number of subchannels.

    8. Resource allocation in OFDMA networks based on interior point methods (pages 1493–1508)

      Mehri Mehrjoo, Somayeh Moazeni and Xuemin (Sherman) Shen

      Version of Record online: 15 NOV 2010 | DOI: 10.1002/wcm.838

      Thumbnail image of graphical abstract

      Non-convexity of utility-based resource allocation in OFDMA wireless networks is treated in this paper. A penalty function method and an interior point method (PM/IPM) are proposed to solve the resource allocation optimization problem. The performance of PM/IPM is compared by a genetic algorithm one.

    9. On delay constrained CAC scheme and scheduling policy for CBR traffic in IEEE 802.11e wireless LANs (pages 1509–1520)

      Der-Jiunn Deng, Chih-Heng Ke, Han-Chien Chao and Yueh-Min Huang

      Version of Record online: 15 NOV 2010 | DOI: 10.1002/wcm.840

      Thumbnail image of graphical abstract

      CBR (constant bit rate) traffic is expected to be an important traffic source in wireless networks. Such sources usually have stringent jitter or delay requirements and in many cases they should be delivered exactly as they were generated. In this paper, we propose a strictly guaranteed QoS (quality-of-service) provisioningCAC (call admission control) scheme with a polling-based scheduling policy for CBR traffic in IEEE 802.11e wireless LANs.

    10. Modeling a shallow water acoustic communication channel using environmental data for seafloor sensor networks (pages 1521–1532)

      Peter King, Ramachandran Venkatesan and Cheng Li

      Version of Record online: 15 NOV 2010 | DOI: 10.1002/wcm.851

      Thumbnail image of graphical abstract

      Deployment and testing for ocean sensor networks are difficult and expensive; thus there is a strong reliance on models to aid in design and development of a potential network. Since each ocean region can present very unique challenges, it is of great value to model an environment based on real environmental parameters whenever available. In this paper, we have proposed a method for generating a communications channel model whose parameters are derived from a description of a specific geographic location. The proposed method has proved to be a useful tool in modeling a particular environment and provides insight into underwater sensor node placement and modulation.

  2. Call for Papers

    1. Top of page
    2. Research Articles
    3. Call for Papers
    1. You have free access to this content

SEARCH

SEARCH BY CITATION