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 12 of 12 for “"Cochannel Interference"”.
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A Model-Based Receiver for CPM Signals in a Cochannel Interference Limited Environment
Cochannel interference (CCI) is a major impairment in narrowband cellular systems. To increase the spectral efficiency of the narrowband systems, identical carrier frequencies are reused in distant cells. The interference rejection capability of the receiver determines this frequency reuse and is …
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Performance of orthogonal frequency division multiplexing in a high noise, low signal-to-noise ratio environment with co-channel interference
… wireless applications. Its resilience to cochannel interference and bandwidth efficiency make it ideal for many different applications. With its increasing popularity among disparate facets of society, it becomes likelier that enemy militaries and/or nonmilitary combatants will utilize the …
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Probability Density Function Estimation Applied to Minimum Bit Error Rate Adaptive Filtering
… and a variety of other channel disturbances: cochannel interference, multiple access interference, large and small-scale fading, etc. Adaptive filtering is the usual approach to mitigating this channel distortion. Existing adaptive filtering techniques usually attempt to minimize the mean …
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AMPS co-channel interference rejection techniques and their impact on system capacity
… of mobile communications in recent years, cochannel interference has become a critical problem because of its impact on system capacity and quality of service. The conventional approach to minimizing interference is through better cell planning and design. Digital Signal Processing COSP) …
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Propagation prediction for PCS design in urban microwave channels
… current fixed microwave spectrum. This presents cochannel interference control problems which can be avoided with extensive propagation studies in both measurements and predictions. Currently, there is no readily available tool to predict propagation channels for the small coverage area that PCS …
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Analysis and Development of Blind Adaptive Beamforming Algorithms
… antenna arrays can reduce the effects of cochannel interference, multipath fading, and background noise as compared to more conventional antenna systems. For these reasons, the use of adaptive antennas in wireless communication has received a great deal of attention in the literature. …
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Measurements and models of radio frequency impulsive noise inside buildings
… at 2.44 GHz and 4.0 GHz, and to adjacent and cochannel interference from users near the 902-928 ISM band. Pulse duration statistics indicate that no significant differences exist between impulse durations in the measured bands. This suggests that impulsive noise inside buildings is very …
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Differential MMSE: A New Approach for Adaptive Interference Suppression Over Time-Varying Channels
… 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 MMSE adaptation is unable to track the …
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Performance evaluation for communication systems with receive diversity and interference
… technique used to combat fading and suppress cochannel interference. In this dissertation, expressions are developed to evaluate the error probability of OC for systems with multiple interferers and multiple receiving branches. Three approaches are taken to derive the expressions. The first …
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Performance of GMSK and 7/4-DQPSK Modulations in Land Mobile Radio Channels
… by additive white Gaussian noise. In addition to cochannel interference, delayed signals and Doppler effects have to be considered. In this thesis the effect of predetection filter bandwidth on the bit error rate performance of GMSK with one-bit differential detection in this environment has been …
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Cooperative Game Theory and Non-convex Optimization Analysis of Spectrum Sharing
… allocation of spectrum. We show that in high interference environments, the utility space of the game is non-convex, which may make some optimal allocations unachievable with pure strategies. However, we show that as the number of channels available increases, the utility space becomes close …
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ΜΕΛΕΤΗ ΚΑΙ ΑΞΙΟΛΟΓΗΣΗ ΤΗΣ ΣΥΜΠΕΡΙΦΟΡΑΣ Μ-ARY ΣΥΜΒΑΤΩΝ PSK ΣΥΣΤΗΜΑΤΩΝ ΨΗΦΙΑΚΗΣ ΔΙΑΜΟΡΦΩΣΗΣ ΜΙΚΡΟΚΥΜΑΤΙΚΩΝ ΔΟΡΥΦΟΡΙΚΩΝ ΖΕΥΞΕΩΝ ΠΑΡΟΥΣΙΑ ΠΑΡΕ...
… CHARACTERIZED BY THE PRESENCE OF GAUSSIAN NOISE, INTERFERENCE AND/OR FADING HAS BEEN EXTENSIVELY ANALYSED. HOWEVER IT IS WELL KNOWN THAT CERTAIN COMPONENTS OF NOISE ORIGINATING IN VARIOUS COMMUNICATION CHANNELS OF TEN EXHIBIT IMPULSIVECHARACTERISTICS, I.E. BURSTS OF LARGE AMPLITUDE IN COMPARISON …