International Journal of Communication Systems

Cover image for Vol. 25 Issue 11

November 2012

Volume 25, Issue 11

Pages 1381–1512

  1. Research Articles

    1. Top of page
    2. Research Articles
    3. Short Communications
    1. Frame-based adaptive uplink scheduling algorithm in orthogonal frequency division multiple access-based Worldwide Interoperability for Microwave Access networks (pages 1381–1397)

      Bor-Jiunn Hwang, I-Shyan Hwang and Chih-Wei Huang

      Article first published online: 3 AUG 2011 | DOI: 10.1002/dac.1313

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      Available resources for real-time and non-real-time traffics, called frame-based adaptive bandwidth allocation (FBABA), and minimum guarantee and weight-based bandwidth allocation (MGWBA), respectively, are proposed in this paper.

    2. Compressed error and erasure correcting codes via rank-metric codes in random network coding (pages 1398–1414)

      Siguang Chen, Meng Wu and Weifeng Lu

      Article first published online: 16 AUG 2011 | DOI: 10.1002/dac.1316

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      In this paper, we reduce the computation overhead dramatically by employing efficient algorithm to detect and delete linearly dependent received packets in destination node. We also simplify the hardware operations in decoding process. If at most r original packets get combined in k packets of one batch, the payload of one packet can increase from to for the application of compressed code. In particular, the compressed code does not enhance the overall decoding complexity of the system.

    3. Toward efficient protocol design through protocol profiling and performance assessment: using formal verification in a different context (pages 1415–1431)

      Stylianos Georgoulas and Klaus Moessner

      Article first published online: 4 AUG 2011 | DOI: 10.1002/dac.1317

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      In this paper, we aim to showcase the capabilities of formal verification when applied in the context of protocol profiling and performance assessment. As we show, it is possible not to only detect deadlock and livelock situations but to also derive with a high degree of confidence performancerelated bounds and profile protocol actions against their contribution or impairment on performance metrics. This can be applied to protocol mechanisms operating at all layers, from the physical layer to the application layer.

    4. An efficient and provably-secure certificateless signature scheme without bilinear pairings (pages 1432–1442)

      D. He, J. Chen and R. Zhang

      Article first published online: 26 SEP 2011 | DOI: 10.1002/dac.1330

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      The key findings presented in the paper is described as follows. (1) We proposed an efficient certificateless signature scheme without pairings. (2) We also show the proposed scheme is secure in the random oracle. (3) The experimental results show the proposed scheme has better performance than the related schemes.

    5. Cryptanalysis of an efficient three-party password-based key exchange scheme (pages 1443–1449)

      Marcos A. Simplicio Jr. and Rony R.M. Sakuragui

      Article first published online: 3 NOV 2011 | DOI: 10.1002/dac.1373

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      Three-party password-authenticated key exchange (3PAKE) protocols allow two entities to negotiate a secret session key with the aid of a trusted server with whom they share a human-memorable password. In this paper, we show that the highly efficient 3PAKE solution recently proposed by Lou and Huang is vulnerable to key-compromise impersonation and offline password guessing attacks. Such attacks do not require the attacker to share a password with the server, and can thus be perpetrated by system insiders or outsiders.

    6. FEM modeling of SAR distribution and temperature increase in human brain from RF exposure (pages 1450–1464)

      A. Yasin Citkaya and S. Selim Seker

      Article first published online: 20 FEB 2012 | DOI: 10.1002/dac.2322

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      This study has aimed to design, implement, and analyze numerical setups for the simulations of RF exposure related SAR and temperature increase in human brain and head. For this purpose, specific models for human head and telephone antenna are chosen; and the Finite Element Method (FEM) has been selected for solving partial differential equations related to electromagnetic wave equations and bioheat equation. After the comparable results are obtained with the literature, the study is turned to the effects of different parameters on the exposure levels.

    7. Network-coded multiple-source cooperation aided relaying for free-space optical transmission (pages 1465–1478)

      Xiaolin Zhou, Dingchen Zhang, Yandong Yang and Mohammad S. Obaidat

      Article first published online: 11 OCT 2012 | DOI: 10.1002/dac.2450

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      A network-coded cooperative (NetCC) relaying aided free-space optical (FSO) transmission scheme is designed. The resultant multiple-source cooperation diversity is exploited by the relay mitigate the strong turbulence-induced fading experienced in FSO channels. The simulations prove that the NetCC FSO scheme can achieve a significant bit error ratio improvement in comparison with conventional noncooperation scheme over Gamma-Gamma turbulence channels.

  2. Short Communications

    1. Top of page
    2. Research Articles
    3. Short Communications
    1. Rain attenuation measurements over terrestrial microwave links operating at 15 GHz in Malaysia (pages 1479–1488)

      A.Y. Abdulrahman, T. Abdul Rahman, S.K. Abdulrahim and Md.  Rafiqul Islam

      Article first published online: 12 AUG 2011 | DOI: 10.1002/dac.1315

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      The measured cumulative statistics of rain attenuation is underestimated by ITU-R predictions. The underestimation becomes highly pronounced at extremely higher rain rates. It has been demonstrated in this paper that the ITU-R prediction errors could be modeled as a function of rainfall rate R. This error may be incorporated to enhance the performance of the ITU-R method on terrestrial microwave systems operating at 15 GHz in tropical Malaysian climate.

    2. A low-complexity single-carrier frequency-division multiple access transmitter (pages 1489–1495)

      Haewoon Nam and Youngok Kim

      Article first published online: 20 OCT 2011 | DOI: 10.1002/dac.1353

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      In this paper, a framework for a computationally efficient single-carrier frequency-division multiple access (SC-FDMA) transmitter is proposed. When the localized subcarrier allocation is used for SC-FDMA, the inverse fast fourier transform can take advantage of the sparse user input vector to reduce its complexity. The analytical and simulation results show that the proposed framework can provide a significant complexity reduction compared with the conventional SC-FDMA transmitter.

    3. Outage probability and channel capacity for the Nth best relay selection AF relaying over INID Rayleigh fading channels (pages 1496–1504)

      K. Ko and C. Woo

      Article first published online: 27 OCT 2011 | DOI: 10.1002/dac.1357

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      In this paper, we derive the approximated outage probability and channel capacity for the Nth best OAF relay systems over INID Rayleigh fading channels. At first, the indirect link's received SNR is approximated as harmonic mean upper bound. With this information, we obtain the given relay's Nth best selection probability as the closed form. Finally, both outage probability and channel capacity are derived as the closed forms. Simulation results are finally presented to validate the analysis.

    4. Performance analysis of multi-antenna relay communication systems with MRC (pages 1505–1512)

      Zhang-Jun Guan, Wei-Jiong Zhang and Xi-Lang Zhou

      Article first published online: 29 FEB 2012 | DOI: 10.1002/dac.2334

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      In this letter, closed-form expressions of outage probability of a decode-and-forward relay communication system are derived with maximum ratio combining and minimum routes maximum ratio combining. An adaptive grouping algorithm of relay antennas is also presented under the constraint of total antenna number.