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 33 for “"Rayleigh Fading Channels"”.
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Reliable communication over Rayleigh fading channels
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Wavelet Modulation in Gaussian and Rayleigh Fading Channels
… performance of wavelet modulation in Gaussian channels. This paper extends the investigation to the performance of wavelet modulation in time varying channels. We show that bit error rate (BER) wavelet demodulation performance in the additive, white, Gaussian noise (AWGN) channel is comparable …
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A comparison of two novel channel coding techniques for CDMA
… for additive white Gaussian noise (AWGN) channels and frequency non-selective Rician Fading (FNRF) channels. The performance of coded CDMA systems in frequency selective Rayleigh fading channels is also analyzed using simulation techniques. Both analytic and simulation results show that by …
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Energy-Efficient Multicarrier and Multicarrier-CDMA Systems
… frequency-selective and frequency-non-selective channels. Methods are proposed for reduction of energy costs of an OFDM system. They are: i) Clipping (CL) based on symbol statistics; ii) Partial Transmit Sequence (PTS) using Magic square pattern and adjacent partitioning; and iii) Selective …
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Self-concatenated coding for wireless communication systems
… White Gaussian Noise (AWGN) and uncorrelated Rayleigh fading channels. We designed both the symbol-based Self-Concatenated<br/>Codes considered using Trellis Coded Modulation (SECTCM) and bit-based Self- Concatenated Convolutional Codes (SECCC) using a Recursive Systematic Convolutional (RSC) …
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Design and analysis of transmission strategies in wireless relay networks
… scheme in both additive white Gaussian noise and Rayleigh fading channels is presented. Furthermore, it is shown that MIF scheme in Rayleigh fading channels can achieve a full diversity order. A distributed space-time coded soft information relaying in Rayleigh fading channels is also considered. …
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Adaptive Channel Estimation for Turbo Decoding
… filter is proposed for the turbo decoding on Rayleigh fading channels with noisy channel estimates. The extrinsic information generated from the turbo decoder has some priority information about the transmitted data bits, which can help us better understand the channel characters. By using the …
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Novel receiver architectures for mobile communications
… in channel estimation for turbo decoding in Rayleigh fading channels.
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Wireless speech and audio communications
… Eb/N0, when communicating over uncorrelated Rayleigh fading channels. By contrast, when employing the MPEG-4 AAC audio codec and protecting the class-1 audio bits using a 2/3-rate NSC code, a more substantial Eb/N0 gain of about 2 dB was achieved. As a further design alternative, we also …
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Optimal Detection with Imperfect Channel Estimation for Wireless Communications
… systems transmitting data through unknown fading channels, traditional detection techniques are based on channel estimation (e.g., by using pilot signals), and then treating the estimates as perfect in a minimum distance detector. In this thesis, we derive and investigate an optimal …
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A hybrid-structure offset-QAM filter-bank multi-carrier MIMO system
… with FDE at the receiver in frequency selective Rayleigh fading channel. The Alamouti SFBC block coding is performed on the complex-orthogonal signal before OQAM processing, which resolves the problems of intrinsic interference when integrating OQAM/FBMC with MIMO. In better multipath channel …
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Differential modulation and non-coherent detection in wireless relay networks
… nature of cooperative networks, acquiring fading channels information for coherent detection is more challenging than in the traditional point-to-point communications. To bypass the requirement of channel information, differential modulation together with non-coherent detection can be …
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Iterative decoding for rate adaptive forward error correction on the mobile satellite channel.
… code and find its performances on AWGN and Rayleigh fading channels through computer simulations. Three rate coding systems for the mobile satellite channel are presented. A performance criterion for speech transmission with such systems have been determined. Adaptive rate techniques can …
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Network lifetime extension, power conservation and interference suppression for next generation mobile wireless networks
… energy routing for multihop wireless networks in Rayleigh fading channels is proposed. It is based on the concept of power combining, whereby two users transmit same signal to the destination user, emulating transmit diversity with two transmit antennas. Analytical framework for the evaluation of …
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Harvesting time-frequency-space diversity with coded modulation for underwater acoustic communications
… emerges because underwater acoustic (UWA) channels have time-varying statistics, thus a coded modulation scheme optimally designed for a specific channel model will be suboptimal when the channel statistics change. A robust approach should use a coded modulation scheme that provides good …
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Communications over fading channels with partial channel information : performance and design criteria
… some statistical information of the wireless fading channels is available. These results are useful in determining the optimal design of system parameters. Suboptimal receivers are designed for systems that are constrained in terms of implementation complexity. The achievable rates are …
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Optimum Design of Spectral Efficient Green Wireless Communications
… communication systems operating in quasi-static Rayleigh fading channels. The new FER expression enables the accurate modeling of EE and SE for various wireless communication systems. Second, the optimum designs of automatic repeat request (ARQ) and hybrid ARQ (HARQ) systems are performed to by …
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An investigation of Turbo Codes over Mobile Wireless Channels
… estimation are investigated over AWGN and Rayleigh fading channels. The decoder systems are compared for complexity as well as for equal numbers of iterations. Results show that less complex decoder strategies produce good results for voice quality bit error rates. Investigations are also …
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Analysis of a Two-Branch Maximal Ratio and Selection Diversity System with Unequal Branch Powers and Correlated Inputs for a Rayleigh Fading Channel
… for analyzing two-branch diversity systems for a Rayleigh fading channel. In many cases the fading received at both branches (i.e. a two-antenna element system) is correlated because of the proximity of the antenna elements to each other. It is also not uncommon for a diversity system to use …
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