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dc.contributorChia-Hung Yehen_US
dc.contributorFeng-Tsun Chienen_US
dc.contributor.advisorMin-Kuan C. Changen_US
dc.contributor.authorChou, Chia-Chingen_US
dc.identifier.citationCheong Yui Wong, R.S. Cheng, K.B. Lataief, R.D.Murch,"Multiuser OFDM with adaptive subcarrier, bit, and power allocation", emph{in Proc. IEEE Journal on Selected Areas in Communications}, pp.1747-1758, Oct. 1999 R.F.H. Fischer and J.B. Huber, " A New Loading Algorithm for Discrete Multitone Transmission", in Proc. IEEE Globecom'96, London, UK, pp.724-728, Nov. 1996 R.V. Sonalkar, D. Applegate, "Shannon capacity of frequency-overlapped digital subscriber loop channels", in Proc. IEEE ICC'02, Vol. 3, pp.1741- 1745, May 2002 R.Grunheid, E.Bolinth, H Rohling, " A blockwise loading algorithm for the adaptive modulation technigue in OFDM systems",in Proc. IEEE Vehicular Technology Vonference, Vol. 2, pp. 948-951, Oct. 2001 Jianmin Mao, W. Melody Moh ,Belle Wei, "PQWRR Scheduling Algorithm in Supporting of DiffServ", in Proc. IEEE ICC'01, pp. 679-684, June 2001 Manolis G. H. Katevenis,"Fast Switching and Fair Control of Congested Flow in Broadband Networks", in Proc. IEEE Journal on Selected Areas in Communications, Vol. 5, pp. 1315-1326, Oct. 1987 R.van Nee and R. Prasad,"OFDM for Wireless Multimedia Communications".2000. L. Hanzo, M. Munster, B.J. Choi and T. Keller,"OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting".2003. Weinstein, S. B., and P .M. Ebert, "Data Transmission by Frequency Division Multiplexing Using the Discrete Fourier Transform," IEEE Trans. Comm., Vol. COM-19, pp. 628 - 634, Oct. 1971. L. Hanzo, W. Webb, and T. Keller, Single- and Multi-Carrier Quadrature Amplitude Modulation: Principles and Applications for Personal Communications, WLANs and Broadcasting. John Wiley and IEEE Press, 2000. J. K. Cavers, "An Analysis of Pilot Symbol Assisted Modulation for Rayleigh Fad-ing Channels,"IEEE Transactions on Vehicular Technology, vol. 40 pp 686-693 November 1991. Van de Beek, J. J., M. Sandell, M. Isaksson, and P. O. Borjesson, "Low-Complex Frame Synchronization in OFDM Systems," Proceedings of International Conference on Universal Personal Communications ICUPC''95, Nov. 1995. Sandell, M., J. J. van de Beek, and P. O. Borjesson, "Timing and Frequency Synchronization in OFDM Systems Using the Cyclic Prefix,"Proceedings of Int.Symp. On Synchronization}, Saalbau, Essen, Germany, 1995, pp. 16-19, Dec. 14-15,1995. Moose, P. H., "A Technique for Orthogonal Frequency Division Multiplexing Frequency Offset Correction," IEEE Trans. on Comm., Vol. 42, No. 10,pp. 2908-2914, Oct. 1994. Wamer, W. D., and C. Leung, "OFDM/FM Frame Synchronization for Mobile Radio Data Communization," IEEE Trans. on Vehicular Tech.,Vol. 42, No. 3, pp.302-313.Aug. 1993. Schmidi, T. M., and D. C. Cox, "Robust Frequency and Timing Synchronization for OFDM," IEEE Trans. on Comm., Vol. 45, No. 12, pp.1613-1621, Dec. 1997. Lambrette, U., M. Speth, and H. Meyr, "OFDM Burst Frequency Synchronization by Single Carrier Training Data," IEEE Communications Letters, Vol. 1, No. 2, pp. 46-48, Mar. 1997. A. Leon-Garcia, I. Widjaja, "Communication Networks Fundamental Concepts and Key Architectures".2000. M. Katevenis, S. Sidiropoulos, C. Courcoubetis, "Weighted round-robin cell multiplexing in a general-purpose ATM switch chip",IEEE Journal on Selected Areas in Communications, Vol. 9, Issue: 8, October 1991, pp. 1265 -1279. J. Wang, and Y. Levy, "Managing performance using weighted round-robin", Computers and Communications, 2000. Proceedings. ISCC 2000. Fifth IEEE Symposium on, 2000, pp. 785-792. H. Yokota, M. Forsberg, and T. Asami, "Extension to Weighted Round Robin Packet Scheduling for Variable-length Packet Networks", IEICE Trans. Inf. and Syst., vol. E82-D, no. 3, pp. 668-676, March, 1999. Wei Wang, Keun Chul Hwang, Kwang Bok Lee, and Saewoong Bahk,"Resource Allocation for Heterogeneous Services in Multiuser OFDM Systems", in Proc. IEEE GLOBECOM''04, Volume 6, pp.3478- 3481, Nov. 2004en_US
dc.description.abstractIn this thesis, we present a switch-based algorithm allocating sub-channels and an adaptive modulation in multi-service stream orthogonal frequency division multiplexing (OFDM) systems. Conventional schemes were proposed to optimize the system performance, such as bandwidth efficiency, Bit error rate (BER), and etc. However, these schemes could result in the unfairness in resource allocation. Thus, in this work, a new resource allocation algorithm based on weighted round robin (WRR) is proposed to conquer this unfairness, improve the system throughput and maintain the queueing length of each individual stream to a predefined region. Meanwhile, combining the adaptive assignment in diverse sub-channels not only augments the bandwidth efficiency but also sub-optimizes the entire performance in the environment with the limited resource. The ability of maintaining the queueing length could guarantee the queueing delay according to Little''s law. This feature makes the proposed approach suitable for delay constraint services. The preliminary simulation results demonstrate the aforementioned ability.en_US
dc.description.tableofcontents1 Introduction----------------------------------------1 1.1 Introduction-----------------------------------1 1.2 Research Motivation----------------------------2 1.3 Organization of the Thesis---------------------3 2 Relevant Works--------------------------------------4 2.1 Introduction-----------------------------------4 2.2 Basic Concepts of OFDM-------------------------4 2.2.1 Subcarriers Generation------------------5 2.2.2 Using IFFT to Generate Subcarriers------6 2.2.3 OFDM Modulation-------------------------8 2.2.4 Guard Time and Cyclic Extension---------8 2.2.5 Synchronization------------------------12 2.2.6 Bandwidth Efficiency-------------------15 2.2.7 Applications of OFDM-------------------16 2.2.8 OFDM Parameters------------------------17 2.3 Radio Resource Management, RRM----------------19 2.3.1 FIFO----------------------------------19 2.3.2 Priority Queuing, PQ------------------20 2.3.3 Fair Queueing, FQ---------------------20 2.3.4 Weight Round Robin, WRR---------------21 3 Proposed Algorithm---------------------------------24 3.1 System Model----------------------------------24 3.2 Weight Assignment-----------------------------26 3.3Practical Value of the Step Size---------------29 4 Simulation Assignment------------------------------32 4.1 Results in BER under Different SNR------------32 4.2 Queueing Length for WRR Scheduler-------------33 4.3 Average Queueing Length for Different Lreq----35 4.4 Performance Results for Each Step Size--------36 4.5 Weight Distribution---------------------------37 5 Conclusions ---------------------------------------38en_US
dc.titleThe Switch-based Subcarrier Allocation Policies in Multi-service OFDM Systemsen_US
dc.typeThesis and Dissertationzh_TW
item.openairetypeThesis and Dissertation-
item.fulltextno fulltext-
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