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Frequency Generalized MC-CDMA Systems and Performance over Multiband Channels and with Multiple Level Orthogonal (MLO) Codes

Zhang, Jingtao
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289279214

Abstract Details

2010, Doctor of Philosophy (PhD), Ohio University, Electrical Engineering (Engineering and Technology).
In this dissertation, we propose a new transmission scheme called frequency generalized multicarrier code division multiple access (FG-MC-CDMA) for future wireless communications. The FG-MC-CDMA system uses multi-code and concatenated-codes to provide users flexible data rates and a range of system performance to satisfy the variable service QoS requirements for multimedia applications. FG-MC-CDMA performance is evaluated on both single band and multiband (MB) channel conditions. We also propose the use of multiband channels in future wireless communication systems to alleviate the problem of radio spectrum scarcity. Multiband channels are classified into three different categories based on the frequency separation of different sub-bands. MC-CDMA systems, including the FG-MC-CDMA system, can be easily designed to work on multiband channels. In the MC-CDMA multiband application, we study the single-user transmitted power allocation problem to explore the effects of multi-band diversity. The optimal (minimum BER) power allocation algorithm with the restriction of a fixed transmitted power is derived, and analytical BER expressions for this optimal power allocation are provided. We also propose to use multi-level orthogonal (MLO) codes in MC-CDMA to exploit frequency diversity further. With maximum likelihood sequence detection (MLSD), MLO codes are shown to provide much better system performance than traditional binary orthogonal codes. In the last part, we briefly cover the performance impairment factors to FG-MC-MCDA systems and use channel estimation as an example to demonstrate that accurate system performance can only be evaluated with careful considerations of all factors in real applications.
David W. Matolak, PhD (Committee Chair)
Jeffrey Dill, PhD (Committee Member)
Roger Radcliff, PhD (Committee Member)
Trent Skidmore, PhD (Committee Member)
Wei Lin, PhD (Committee Member)
Dinh V. Huynh, PhD (Committee Member)
MC-CDMA; FG-MC-CDMA; multicarrier; OFDM; CDMA; power allocation; multiband; multi-level orthogonal codes (MLO)

Recommended Citations

Citations

  • Zhang, J. (2010). Frequency Generalized MC-CDMA Systems and Performance over Multiband Channels and with Multiple Level Orthogonal (MLO) Codes [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289279214

    APA Style (7th edition)

  • Zhang, Jingtao. Frequency Generalized MC-CDMA Systems and Performance over Multiband Channels and with Multiple Level Orthogonal (MLO) Codes. 2010. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289279214.

    MLA Style (8th edition)

  • Zhang, Jingtao. "Frequency Generalized MC-CDMA Systems and Performance over Multiband Channels and with Multiple Level Orthogonal (MLO) Codes." Doctoral dissertation, Ohio University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289279214

    Chicago Manual of Style (17th edition)

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© 2010, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.