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ABSTRACT: This paper investigates the subcarrier and power allocation problems of multi-user space-time block coded OFDM based cellular
systems. Based on the tradeoff between the number of assigned subcarriers and the amount of allocated power for users, a less
complexity algorithm that separates subcarrier allocation and power allocation is proposed. Simulation results show that the
proposed resource allocation algorithm can improve the capacity significantly compared with static FDMA fixed allocation algorithm
and the MIMO-OFDMA scheme, and the more important thing is that it can make the capacity be distributed more fairly, very
close to the ideal rate constraints, among users than the scheme which maximizes the system capacity only.
KeywordsOrthogonal frequency division multiplexing (OFDM)-Resource allocation-Space-time block code (STBC)-Sum capacity-Water-filling
Wireless Personal Communications 04/2012; 53(2):163-177. · 0.46 Impact Factor
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ABSTRACT: Multiple antenna orthogonal frequency division multiple access (OFDMA) is a promising technique for the high downlink capacity in the next generation wireless systems, in which adaptive resource allocation would be an important research issue that can significantly improve the performance with guaranteed QoS for users. Moreover, most of the current resource allocation algorithms are limited to the unicast system. In this paper, dynamic resource allocation is studied for multiple antenna OFDMA based systems which provide multicast service. The performance of multicast system is simulated and compared with that of the unicast system. Numerical results also show that the proposed algorithms improve the system capacity significantly compared with the conventional scheme.
IEEE Transactions on Broadcasting 04/2010; · 1.70 Impact Factor
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ABSTRACT: Multiple antenna techniques are hard to implement because the physical size of the mobile phones or the hardware capability is limited. In this paper, a joint distributed space time coding and equalization technique is proposed for cellular communication system in order to obtain the advantages of MlMO system requiring only one antenna for each mobile user. The proposed scheme can reduce two time slots during the cooperation phase. Simulation results show that the proposed scheme outperforms the conventional distributed space-time coded cooperative scheme in terms of system capacity. And also it achieves the same diversity gain as the conventional distributed space-time coded cooperative scheme with time division multiple access.
IEEE Transactions on Consumer Electronics 03/2008; · 0.94 Impact Factor
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IEICE Transactions. 01/2008; 91-B:2025-2028.
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ABSTRACT: Crosstalk is a major issue in modern ADSL and VDSL systems. Static spectrum management (SSM), the traditional way to guarantee spectrum compatibility, employs spectral masks which can be overly restrictive and result in poor performance. In this paper, fixed margin iterative water-filling algorithm is applied in downstream VDSL and ADSL2+ scenario when they are in the same binder. The algorithm can minimize the transmission power and at the same time the overall high-quality service is guaranteed for all the users of the same binder. The simulation results show that ADSL2+ can realize performance gains by up to 80% compared with SSM techniques or ADSL.
Information Technology Convergence, 2007. ISITC 2007. International Symposium on; 12/2007
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ABSTRACT: Multiple-input multiple-output (MIMO) antennas can be combined with orthogonal frequency division multiplexing (OFDM) to increase
system throughput by spatial multiplexing. That is the requirement of high speed future wireless networks such as WLANs and
WMANs. This paper investigates the radio resource management problem of MIMO-OFDM based wireless network systems in order
to maximize the total system throughput subject to the total power and proportional rate constraints of each user. A low-complexity
algorithm that separates subcarrier allocation and power allocation is proposed. Simulation results show that the proposed
resource allocation algorithm can improve the throughput and also it can make the throughput be distributed more fairly among
users than some other schemes.
11/2007: pages 261-270;
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ABSTRACT: This paper investigates the subcarrier and power allocation problem of multi-user space-time block coded OFDM systems with each subcarrier shared by two users. The objective is to maximize the total system capacity subject to the power and proportional rate constraints of each user. A low-complexity suboptimal algorithm that separates subcarrier allocation and power allocation is proposed. Simulation results show that the proposed resource allocation algorithm for space-time block coded OFDM can improve the capacity significantly with the same BER performance compared with static FDMA fixed allocation algorithm and the MIMO-OFDMA scheme in which each subcarrier is used only by one user. Furthermore, the more important point is that it can make the capacity be distributed more fairly, very close to the ideal rate constraints, among users than the scheme which maximizes the system capacity only.
Vehicular Technology Conference, 2007. VTC2007-Spring. IEEE 65th; 05/2007
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Embedded and Ubiquitous Computing, International Conference, EUC 2007, Taipei, Taiwan, December 17-20, 2007, Proceedings; 01/2007
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Proceedings of the 63rd IEEE Vehicular Technology Conference, VTC Spring 2006, 7-10 May 2006, Melbourne, Australia; 01/2006
