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 20 of 26 for “"Rake Receiver"”.
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A multistage RAKE receiver for CDMA systems
This thesis proposes a multistage RAKE receiver for use at the base station of a Code Division Multiple Access (CDMA) cellular communications system. This receiver combines the interference rejection capability of multiuser receivers with the robust performance of a RAKE receiver in the presence of …
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Area and Power Conscious Rake Receiver Design for Third Generation WCDMA Systems
A rake receiver, which resolves multipath signals corrupted by a fading channel, is the most complex and power consuming block of a modem chip. Therefore, it is essential to design a rake receiver be efficient in hardware and power. We investigated a design of a rake receiver for the WCDMA …
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Space-time Processsing for the Wideband-CDMA System
… system. Combining the antenna array with a RAKE receiver, both of which exploits multipath diversity, can significantly improve the system performance. In this research, we investigate the performance of these beamformer-RAKE receivers, also known as two-dimensional (2-D) RAKE receiver, for …
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Bit error rate simulation of a CDMA system for personal communications
… polarization are compared. In the simulation, a RAKE receiver is implemented, the advantage of this RAKE receiver implementation is demonstrated by comparison to a single correlation receiver. Results for outage probability are also presented.
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An adaptive multistage interference cancellation receiver for CDMA
… research on multistage interference cancellation receivers for Code Division Multiple Access (CDMA) systems has relied on the use of simulation techniques for performance evaluation. This thesis formulates a model for an adaptive multistage interference cancellation receiver within a CDMA system …
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The Performance of Direct-Sequence Spread-Spectrum Communications With Selective Fading Channels and Rake Reception
… is evaluated for selective fading channels and rake reception. Several issues are examined that influence the probability of error of the system, and closed-form expressions are obtained for the probability of error. The development of these expressions and the use of a general class of channel …
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Channel shortening equalizers for UWB receiver design simplification
… To exploit the temporal diversity, a UWB receiver usually incorporates Rake reception. Each multipath in the channel carries just a fraction of the signal energy. This phenomenon dictates a Rake receiver with a large number of fingers to achieve good energy capture and output signal to …
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The Impact of Signal Bandwidth on Indoor Wireless Systems in Dense Multipath Environments
… bandwidth is increased, the complexity of a Rake receiver (or other receiver structure) required to capture the available power also increases. In addition, accurate channel estimation is required to realize this performance, which becomes increasingly difficult as energy is dispersed among …
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Space Time Processing for Third Generation CDMA Systems
… interference (MAI). A Two Dimensional (2-D) receiver combats both of these by processing the signal both in the spatial and temporal domain. An ideal 2-D receiver would perform joint space-time processing, but at the price of high computational complexity. In this dissertation we investigate …
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Hybrid Channel Coding for Error-Sensitive Class on DS-CDMA Air Interface
A DS-CDMA system with QPSK modulation and a RAKE receiver is modeled and simulated. A mathematical description of the DS-CDMA system is provided on uplink and downlink. For a multipath channel environment, modeling techniques for AWGN and Rayleigh fading are illustrated. Comparisons are made …
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Performance analysis of CDMA systems in multipath channels
… fourth objective is a performance analysis for a RAKE receiver applied to outdoor channels.
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Simulation and Mathematical Tools for Performance Analysis of Low-Complexity Receivers
… design and performance evaluation of suboptimal receiver implementations has received considerable attention owing to complexity in the realization of the optimal receiver algorithms over wireless channels. This thesis addresses the effects of using reduced complexity receivers for the Satellite …
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CAPACITY ENHANCEMENT OF CDMA SYSTEM USING ANTENNA ARRAY
… show that using antenna array together with RAKE receiver at the base station can greatly increase the system capacity and mitigate multipath effect. It is shown that the system parameters such as data bit rate, activity factor of users, array size, and voice-to-data users ratio may affect …
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Pulse Shaping Filter Design and Interference Analysis in UWB Communication Systems
… Gaussian noise and jamming tones. Finally, a RAKE receiver simulation model under a realistic UWB channel is proposed and numerical results are presented. Overall, this dissertation investigates several important issues in the application of UWB technology, and provides some insights on the …
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Differential MMSE: A New Approach for Adaptive Interference Suppression Over Time-Varying Channels
… (MMSE) criterion to design coherent adaptive receivers is a classical method for interference suppression, with applications ranging from equalization to adaptive multiuser detection for direct sequence code division multiple access (CDMA) systems. A drawback of this method is that standard …
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Radio Channel Measurements and Modeling for Smart Antenna Array Systems Using a Software Radio Receiver
… A four-channel, wideband, software-defined receiver was developed to serve as a test bed for wideband measurements and antenna array experiments. This receiver was used to perform vector channel measurements in terrestrial and air-to-ground environments using an antenna array. ent results …
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Simulation of an Implementation and Evaluation of the Layered Radio Architecture
… implementations of a single user adaptive receiver with adaptive complex filtering and a W-CDMA downlink rake receiver. These metrics are measured from a detailed simulation of Stallion and the Configuration Layer of the Layered Radio Architecture using advanced object oriented programming …
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Pre-equalization for pre-Rake MISO DS-UWB systems
… to resolve dense multipath components and use Rake combining at the receiver in order to significantly reduce the negative effects of fading. However, implementing a Rake receiver with a sufficiently large number of fingers to make use of this advantage is an evident challenge for most UWB …
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Smart Antennas at Handsets for the 3G Wideband CDMA Systems and Adaptive Low-Power Rake Combining Schemes
… minimum selection GSC (MS-GSC) and an adaptive rake combining scheme to reduce the power consumption of mobile rake receivers. The proposed MS-GSC selects a minimum number of branches as long as the combined SNR is maintained larger than a given threshold. The proposed adaptive rake combining …
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Design and Implementation of a Soft Radio Architecture for Reconfigurable Platforms
… is validated with the implementation of two receivers: A single user CDMA receiver based on complex adaptive filtering and a W-CDMA downlink rake receiver with channel estimation. Performance analysis of these receivers show that it is important to keep the paging ratio high while maximizing …
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