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

Bibliographic Details
Main Author:	Zhang, Jingtao
Language:	English
Published:	Ohio University / OhioLINK 2010
Subjects:	MC-CDMA FG-MC-CDMA multicarrier OFDM CDMA power allocation multiband multi-level orthogonal codes (MLO)
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289279214

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-ohiou12892792142021-08-03T05:46:45Z Frequency Generalized MC-CDMA Systems and Performance over Multiband Channels and with Multiple Level Orthogonal (MLO) Codes Zhang, Jingtao MC-CDMA FG-MC-CDMA multicarrier OFDM CDMA power allocation multiband multi-level orthogonal codes (MLO) 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. 2010 English text Ohio University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289279214 http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289279214 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	MC-CDMA FG-MC-CDMA multicarrier OFDM CDMA power allocation multiband multi-level orthogonal codes (MLO)
spellingShingle	MC-CDMA FG-MC-CDMA multicarrier OFDM CDMA power allocation multiband multi-level orthogonal codes (MLO) Zhang, Jingtao Frequency Generalized MC-CDMA Systems and Performance over Multiband Channels and with Multiple Level Orthogonal (MLO) Codes
author	Zhang, Jingtao
author_facet	Zhang, Jingtao
author_sort	Zhang, Jingtao
title	Frequency Generalized MC-CDMA Systems and Performance over Multiband Channels and with Multiple Level Orthogonal (MLO) Codes
title_short	Frequency Generalized MC-CDMA Systems and Performance over Multiband Channels and with Multiple Level Orthogonal (MLO) Codes
title_full	Frequency Generalized MC-CDMA Systems and Performance over Multiband Channels and with Multiple Level Orthogonal (MLO) Codes
title_fullStr	Frequency Generalized MC-CDMA Systems and Performance over Multiband Channels and with Multiple Level Orthogonal (MLO) Codes
title_full_unstemmed	Frequency Generalized MC-CDMA Systems and Performance over Multiband Channels and with Multiple Level Orthogonal (MLO) Codes
title_sort	frequency generalized mc-cdma systems and performance over multiband channels and with multiple level orthogonal (mlo) codes
publisher	Ohio University / OhioLINK
publishDate	2010
url	http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289279214
work_keys_str_mv	AT zhangjingtao frequencygeneralizedmccdmasystemsandperformanceovermultibandchannelsandwithmultiplelevelorthogonalmlocodes
_version_	1719425148187049984

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

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