Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"MC-CDMA"”.
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Beamforming for MC-CDMA
… to 10Mbps. A variation of OFDM is Multi-Carrier CDMA (MC-CDMA) which is an OFDM technique where the individual data symbols are spread using a spreading code in the frequency domain. The spreading code associated with MC-CDMA provides multiple access technique as well as interference suppression. …
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Relay Diversity Techniques for OFDM and MC-CDMA
… relay cyclic delay diversity (RCDD) for OFDM and MC-CDMA<br/>systems. The performance analysis of the wireless relay networks under<br/>dierent protocols and fading channels are investigated. We derived<br/>the formulas for the symbol error rate (SER) of the investigated<br/>schemes in fading …
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MIMO MC-CDMA Systems over indoor optical wireless communication channels
… of multi-carrier code division multiple access (MC-CDMA). Furthermore, the work investigates the robustness of a link design that adopts the combination of these methods in a realistic environment with full mobility.
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On rate capacity and signature sequence adaptation in downlink of MC-CDMA system
This dissertation addresses two topics in the MC-CDMA system: rate capacity and adaptation of users' signature sequences. Both of them are studied for the downlink communication scenario with multi-code scheme. The purpose of studying rate capacity is to understand the potential of applying MC-CDMA …
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Nuevas técnicas de procesado de señal aplicadas al sistema MC-CDMA en enlace ascendente
… de transmisión sobre el diseño de los receptores MC-CDMA. La verosimilitud de la detección en el modo ascendente en los sistemas MC-CDMA ha orientado las investigaciones internacionales a desarrollar otros esquemas de transmisión que son considerados más apropiados al modo ascendente como el …
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Multi-rate access schemes and successive interference cancellation for wireless multimedia MC-CDMA communications
… environments, should be sought. Multi-carrier CDMA (MC-CDMA), a combination of multi-carrier modulation (MCM) and direct-sequence CDMA (DS-CDMA), appears to be one of the most elegant solutions. In this dissertation, four multi-rate access schemes, termed uncoded fixed spreading length (UFSL), …
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High performance multi-carrier technologies with expanded applicability to CDMA systems (DS-CDMA and MC-CDMA)
Code division multiple access (CDMA) has been an important component in wireless communication systems since the early 1980’s. Now the frontrunner in the 3G cellular standard, CDMA techniques have come a long way since their inception. However, these systems are not without their limitations -- …
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Performance of adaptive admission\congestion control policies on a hybrid MC-CDMA\TDMA integrated multimedia networks
Future 3G CDMA networks are expected to have the ability to accommodate variety of users, each with its own transmission characteristics and quality of service (QoS) requirements to be maintained. Compatible multi-access system should provide the means to control (i.e. admission congestion) the …
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Novel multiuser detection and multi-rate schemes for multi-carrier CDMA
… A multi-carrier code division multiple access (MC-CDMA) scheme is a promising candidate for emerging broadband wireless systems. MC-CDMA is a hybrid of orthogonal frequency division multiplexing (OFDM) and code division multiple access (CDMA). The most salient feature of MC-CDMA is that the rate …
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Detection and Coding Techniques for Fourth Generation Air-Interfaces based on Multicarrier Modulation
… (OFDM) and Code Division Multiple Access (CDMA) schemes have been characterised and compared in respect of their performance in different environments and configurations. The first scheme is Multicarrier Direct Sequence CDMA (MCDS-CDMA), based on time domain spreading. The second is …
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Capacity, coding and interference cancellation in multiuser multicarrier wireless communications systems
… multicarrier code division multiple access (MC-CDMA). Coding, interference cancellation, and resource sharing schemes to improve the performance of multiuser multicarrier systems on wireless channels were addressed in this dissertation. Performance of multiple access schemes applied to a …
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On the performance and capacity of space-time block coded multicarrier CDMA communication systems
… space-time block coded (STBC) multicarrier (MC-) CDMA, for next generation of wireless mobile communication systems. The thesis first investigates the bit error ratio (BER) performance and bandwidth efficiency of STBC MC-CDMA systems in the presence of carrier frequency offset (CFO). Then …
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Energy-Efficient Multicarrier and Multicarrier-CDMA Systems
… analysis, and performance of Multicarrier (MC) and Multicarrier-Code Division Multiple Access (MC-CDMA) systems are considered. Specifically, Multicarrier Modulation (MCM) such as Orthogonal Frequency Division Multiplexing (OFDM) is used in these systems with emphasis on energy efficiency. …
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Interference suppression and diversity for CDMA systems
In code-division multiple-access (CDMA) systems, due to non-orthogonality of the spreading codes and multipath channels, the desired signal suffers interference from other users. Signal fading due to multipath propagation is another source of impairment in wireless CDMA systems, often severely …
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Reducing Multiple Access Interference in Broadband Multi-User Wireless Networks
… multi-carrier code division multiple access (MC-CDMA) systems, a full multipath diversity can be achieved by transmitting one symbol over multiple orthogonal subcarriers by means of spreading codes. However, in frequency selective fading channels, orthogonality among users can be destroyed …
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Spectrally Modulated Spectrally Encoded Framework Based Cognitive Radio in Mobile Environment
… Orthogonal Frequency Division Multiplexing), NC-MC-CDMA (non-contiguous multi-carrier code division multiple access) and NC-SC-OFDM (non-contiguous single carrier OFDM), allow the SUs to utilize the available spectrum. Spectrally Modulated Spectrally Encoded (SMSE) framework offers a general …
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Long polyphase sequences for adaptive mmse detector in asynchronous cdma plc network with impulsive noise
… multitrayecto, mientras que las extensiones MC-CDMA y OFDMA han investigado los buenos resultados en entornos sincronos de comunicaciones powerline. Esta tesis examina el rendimiento de algunas de estas tecnicas de acceso multiple en entornos asincronos powerline, usando secuencias de …
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Advanced Interference Suppression Techniques for Spread Spectrum Systems
Code division multiple access (CDMA) techniques have been widely employed by different wireless systems with many advantages. However, the performance of these systems is limited by interference. A number of different interference suppression techniques have been proposed, including multiuser …