Haibo Wang

Beijing Jiaotong University, Peping, Beijing, China

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Publications (17)1.7 Total impact

  • Haibo Wang, Kaixu Xia, Xiaoli Chu
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    ABSTRACT: We investigate the resource-sharing problem of Device-to-Device (D2D) communications underlaying the cellular network. The performance of D2D communications sharing the uplink channel of a cellular system is analyzed by first considering a single cell scenario for analytical tractability. Then we propose a position-based resource-sharing scheme for D2D communications underlying cellular system, and extend the performance analysis to multiple cells with Fractional Frequency Reuse (FFR). Numerical results reveal that the position-based scheme in conjunction with FFR provides a significant performance improvement.
    Communications in China (ICCC), 2013 IEEE/CIC International Conference on; 01/2013
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    ABSTRACT: In this letter, we maximize the multicast capacity of a cellular system with dedicated decode-and-forward (DF) relays, by jointly optimizing transmission data rates of the base station (BS) and the relays subject to an average outage constraint in Rayleigh fading channels. The optimal transmission rates of the BS and relays and the optimal relay locations are obtained based on an outage probability analysis for the relay-assisted multicast. Numerical results show that relay-aided multicast significantly outperforms direct multicast, and the best transmission strategy is for the BS and dedicated relays to transmit at the same rate.
    IEEE Communications Letters 01/2012; 16(10):1592-1595. · 1.16 Impact Factor
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    ABSTRACT: In co-channel deployments of macro and femto cells, the much higher transmit power of a macrocell base station (MBS) than that of a femtocell access point (FAP) may create a femtocell exclusion region (FER) around an MBS, where reliable femto downlink (DL) services cannot be guaranteed. In this paper, we analyze the DL outage probability (OP) of orthogonal frequency division multiple access (OFDMA) based femtocells in terms of their locations with respect to nearby 3-sector MBSs, and derive the expression of FER radius as a function of the azimuth angle relative to the MBS, which can be directly used to divide the macrocell coverage area into inner and outer regions for hybrid frequency assignments. Simulation results show that the obtained closed-form expressions can be used to accurately predict the location-dependent femto DL OP and the non-circular FER in hierarchical 3-sector macrocells. Our results also show that the FER shrinks at edges between macro sectors, giving more space for co-channel deployment of femtocells to improve spatial reuse.
    Communications in China (ICCC), 2012 1st IEEE International Conference on; 01/2012
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    Xiaoli Chu, J.Y. Wu, Haibo Wang
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    ABSTRACT: Femtocells have been considered by the wireless industry as a promising solution not only to improve indoor coverage, but also to unload traffic from already overburdened macrocells. In spite of potentially excessive interference caused by densely deployed femtocells, macrocells may have to share the same spectrum with femtocells, due to spectrum availability and network infrastructure considerations. In this paper, we derive closed-form expressions for downlink outage probabilities (OP) of collocated spectrum-sharing macrocell and femtocells, based on the stochastic geometry theory. Orthogonal frequency division multiple access (OFDMA) is considered in the downlink of both macro- and femto-cells. Simulation results show that the derived OP expressions are able to predict OP performance of collocated spectrum-sharing macro- and femto-cells, and provide insights on the effects of different system and channel parameters on co-channel femtocell deployments.
    Communications (ICC), 2011 IEEE International Conference on; 07/2011
  • Haibo Wang, H.-P. Schwefel
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    ABSTRACT: In this paper, we present two novel ARQ schemes for mobile multicast, which utilize packet-combining to reduce the number of retransmissions. The spectral efficiency of these multicast ARQ schemes are optimized jointly with adaptive modulation and coding (AMC) under specific QoS constraints, and numerical results show that significantly gains can be achieved comparing to schemes without packet-combining. Delay analysis has also been fulfilled for adopting the proposed sub-optimal scheme in practical systems.
    Communications and Mobile Computing (CMC), 2011 Third International Conference on; 05/2011
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    ABSTRACT: Due to considerations of spectrum availability and network infrastructure, existing macrocell networks may have to share the spectrum with overlaid femtocells. In spectrum-sharing macro and femto networks, different transmit powers used by macro base stations (MBS) and femto access points, together with potentially densely deployed femtocells, may create dead spots where reliable coverage cannot be guaranteed to either macro or femto users. In this paper, we devise a decentralized strategy to regulate femtocell management of transmit power and usage of radio resources depending on its distance from the closest MBS. Simulation results for the orthogonal frequency division multiple access (OFDMA) downlink (DL) of spectrum-sharing macro and femto networks show that the proposed decentralized femtocell regulating strategy is able to guarantee reliable DL coverage over targeted macro and femto service areas while providing superior spatial spectrum reuse, for even a large number of spectrum sharing femtocells deployed per cell site.
    Proceedings of the 74th IEEE Vehicular Technology Conference, VTC Fall 2011, 5-8 September 2011, San Francisco, CA, USA; 01/2011
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    ABSTRACT: In mobile multicast transmissions, the receiver with the worst instantaneous channel condition limits the transmission data rate under the desired Quality-of-Service (QoS) constraints. If Automatic Repeat reQuest (ARQ) schemes are applied, the selection of Adaptive Modulation and Coding (AMC) mode will not necessarily be limited by the worst channel anymore, and improved spectral efficiency may be obtained in the efficiency-reliability tradeoff. In this paper, we first propose a Network-Coding-based ARQ (NC-ARQ) scheme in its optimal form and suboptimal form (denoted as Opt-ARQ and SubOpt-ARQ, resp.) to solve the scalability problem of applying ARQ in multicast. Then we propose two joint NC-ARQ-AMC schemes, namely, the Average PERbased AMC (AvgPER-AMC) with Opt-ARQ and AvgPER-AMC with SubOpt-ARQ in a cross-layer design framework to maximize the average spectral efficiency per receiver under specific QoS constraints. The performance is analyzed under Rayleigh fading channels for different group sizes, and numerical results show that significant gains in spectral efficiency can be achieved with the proposed joint NC-ARQ-AMC schemes compared with the existing multicast ARQ and/or AMC schemes.
    EURASIP J. Wireless Comm. and Networking. 01/2010; 2010.
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    ABSTRACT: In mobile multicast transmissions, the receiver with the worst instantaneous channel condition limits the transmission data rate under the desired Quality-of-Service (QoS) constraints. If Automatic Repeat reQuest (ARQ) schemes are applied, the selection of Adaptive Modulation and Coding (AMC) mode will not necessarily be limited by the worst channel anymore, and improved spectral efficiency may be obtained in the efficiency-reliability tradeoff. In this paper, we first propose a Network-Coding-based ARQ (NC-ARQ) scheme in its optimal form and suboptimal form (denoted as Opt-ARQ and SubOpt-ARQ, resp.) to solve the scalability problem of applying ARQ in multicast. Then we propose two joint NC-ARQ-AMC schemes, namely, the Average PERbased AMC (AvgPER-AMC) with Opt-ARQ and AvgPER-AMC with SubOpt-ARQ in a cross-layer design framework to maximize the average spectral efficiency per receiver under specific QoS constraints. The performance is analyzed under Rayleigh fading channels for different group sizes, and numerical results show that significant gains in spectral efficiency can be achieved with the proposed joint NC-ARQ-AMC schemes compared with the existing multicast ARQ and/or AMC schemes.
    EURASIP Journal on Wireless Communications and Networking 01/2010; 2010:10. · 0.54 Impact Factor
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    ABSTRACT: In this paper, we present an innovative ARQ approach for mobile multicast, which utilizes packet-combining to reduce the number of retransmissions. We adopt the proposed ARQ scheme jointly with adaptive modulation and coding (AMC) in a cross-layer design framework to improve the average spectral efficiency per receiver under specific QoS constraints. Expressions are derived for the proposed joint ARQ-AMC schemes, which are then compared with existing multicast schemes under Rayleigh fading channels for different Signal-to-Interference-and-Noise-Ratios.
    Proceedings of the 6th International Wireless Communications and Mobile Computing Conference, IWCMC 2010, Caen, France, June 28 - July 2, 2010; 01/2010
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    ABSTRACT: In this paper we have investigated the joint power and rate adaptation strategies for multicast services for downlink communication. We have proposed a theoretical framework to find out the achievable spectrum efficiency upper boundary of such a scenario and the corresponding optimal solution for power and rate adaptation. Sub-optimal adaptation schemes were also studied and detailed parameter analysis was fulfilled. Numerical results show that one of the suboptimal adaptation schemes with constant power can achieve nearly optimal performance with the simplest adaptation function and parameter selection. The optimal parameter settings were also derived from the numerical analysis.
    Sarnoff Symposium, 2008 IEEE; 05/2008
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    ABSTRACT: In this paper we investigated the adaptive modulation strategies for Multicast service in orthogonal frequency division multiple access systems. We defined a Reward function as the performance optimization target and developed adaptive modulation strategies to maximize this Reward function. The proposed optimization algorithm varied the instantaneous BER constraint of each mobile Multicast receiver according to its individual cumulated BER, which resulted in a significant Reward gain.
    Wireless Communications and Networking Conference, 2008. WCNC 2008. IEEE; 05/2008
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    ABSTRACT: In this paper we focus on adaptive modulation strategies for multicast service in orthogonal frequency division multiple access systems. A reward function has been defined as the optimization target, which includes both the average user throughput and bit error rate. We also developed an adaptive modulation strategy, namely local best reward strategy, to maximize this reward function. The performance of different modulation strategies are compared in different SNR distribution scenarios, and the optimum strategy in each scenario is suggested.
    Wireless Communications and Networking Conference, 2007.WCNC 2007. IEEE; 04/2007
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    ABSTRACT: This paper investigates the radio resource management (RRM) approaches for GSM/GPRS networks. The effort was put on access control (AC), time-slot (TS) allocation, and radio link control (RLC) packet scheduling for down-link performance enhancement. A new credit-based algorithm was proposed and implemented in a system level simulator. The simulation results for overall cell throughput as well as throughput per user show an improvement for the proposed scheme in comparison to a best effort algorithm, in particular in high-load scenarios.
    Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st; 01/2005
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    ABSTRACT: This paper investigates end-to-end quality of service (QoS) provisioning approaches for UMTS networks in a DiffServ IP network environment. The effort was put on QoS classe mapping from DiffServ to UMTS, Access Control, buffering and scheduling optimization. The DiffServ Code Point was utilized in the E2E UMTS QoS provisioning to differentiate different types of traffic. The overall algorithm was optimized to guarantee the E2E QoS parameters of each service class, especially for realtime applications, as well as to improve the bandwidth utilization. Simulation results show that the enhanced algorithm provides flexible and efficient QoS guarantees for multiple UMTS classes.
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    Haibo Wang, Devendra Prasad

Publication Stats

36 Citations
1.70 Total Impact Points

Institutions

  • 2010–2012
    • Beijing Jiaotong University
      • School of Electronics and Information Engineering
      Peping, Beijing, China
  • 2011
    • King's College London
      • Centre for Telecommunications Research (CTR)
      London, ENG, United Kingdom
  • 2005–2008
    • Aalborg University
      • Department of Electronic Systems
      Ålborg, North Denmark, Denmark