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 40 for “"Interference Rejection"”.
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Interference rejection in FM receivers
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1956.
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A CMA-FRESH Whitening Filter for Blind Interference Rejection
… sharing has increased the need for robust interference rejection methods. The Citizens Broadband Radio Service (CBRS) band is soon to be occupied by LTE waveforms and License Assisted Access (LAA) will have LTE signals coexisting with other signals in the 5 GHz band. In anticipation of this …
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Co-channel interference rejection using a model-based demodulator
… same frequency bands in nearby cells, co-channel interference can be a significant problem. A typical digital implementation uses a quadrature demodulation algorithm to estimate the instantaneous frequencies of FM signals and recover the original modulating signal. The use of parametric spectral …
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Channel modeling and interference rejection for CDMA automatic vehicle monitoring systems
… represents an effective approach for CDMA interference rejection. This technique is especially appropriate at the mobile receiver where there is little prior knowledge of the spreading codes of the other users. This thesis presents enhanced forms of the Time Dependent Adaptive Filter …
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AMPS co-channel interference rejection techniques and their impact on system capacity
… 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) based …
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Tunable Filters and Interference Rejection System for Interferer Suppression at RF and Microwave Bands
… 4. Implementing a novel feedback-based interference rejection system to improving the linearity of the BPF for high Q cases, in which the BPF Q is set to a specific value and further increase in Q is achieved using feedback gain. And finally, the second LC tank is added to increase the …
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Development and Analysis of Adaptive Interference Rejection Techniques for Direct Sequence Code Division Multiple Access Systems
… conventional CDMA receivers in a multiple access interference-limited mobile radio environment has spurred research on advanced receiver technologies. This research investigates the use of adaptive receivers for single user demodulation to overcome some of the deficiencies of a conventional …
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Time-Varying Autoregressive Model Based Signal Processing with Applications to Interference Rejection in Spread Spectrum Communications
… apply such methods to frequency-modulated (FM) interference rejection in direct-sequence spread spectrum (DSSS) communications. For fast varying non-stationary signal processing, such as the task to reject an FM interference that could chirp over the entire DSSS bandwidth in a symbol interval, …
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A dual-mode Q-enhanced RF front-end filter for 5 GHz WLAN and UWB with NB interference rejection
… topology that would resolve the narrowband (NB) interference to UWB receiver while being operable in both 802.11a mode and UWB mode. The goal of the dual mode filter design is to reduce cost and complexity by developing a fully integrated front-end filter. The filter design utilizes high Q …
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Collision study for the one-way IVDS channel
A collision study is performed to compare the interference rejection characteristics of two spread spectrum receivers, one employing a sliding correlator and the other using a more sophisticated matched filter design. The testing involves using two similar transmitters, one acting a the jammer, to …
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Diversity and MIMO for body-centric wireless communication channels
… field of interest for researchers. Fading and interference are the two concerns that affect the reliability and quality of service of wireless links. Diversity has been used to overcome these two problems. This thesis looks into the use of receive diversity for on-body channels. Space, pattern, …
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Design and analysis of pattern null reconfigurable antennas
… ability to steer their pattern nulls, yielding interference rejection capabilities. While various NRAs exist, the current state of the art has two significant drawbacks, namely, the requirement for feed reconfiguration and the lack of null scanning capability. This dissertation develops a …
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Adaptive matched field processing in an uncertain propagation environment
… techniques to achieve the effective interference rejection characteristic of adaptive processors while limiting the sensitivity of the processor to environmental mismatch. The derivation of the algorithm is carried out within the framework of minmax signal processing. The optimal …
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Novel Approaches to Overloaded Array Processing
… overloaded environment through the use of MMSE interference rejection filtering embedded in a successive interference cancellation (SIC) architecture. The second receiver architecture enhances signal extraction performance by embedding a stronger interference rejection receiver, the …
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Transmitter precoding for multi-antenna multi-user communications
… the design of low-power receivers. Multi-user interference drastically reduces the energy efficiency of wireless multi-user communications by introducing errors in the bits being detected at the receiver. Interference rejection algorithms and multiple antenna techniques can significantly reduce …
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Adaptive Arrays and Diversity Antenna Configurations for Handheld Wireless Communication Terminals
… were shown to provide 25 to 40 dB or more of interference rejection in the presence of a single interferer in rural, suburban, and urban channels including line-of-sight and non line-of-sight cases. In multipath channels, these performance levels were achieved even when there was no separation …
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Diversity Combining for Frequency-Hop Spread-Spectrum Communications With Partial-Band Interference and Fading (anti-Jam)
… (FH) communications with partial-band interference and fading. The analysis covers systems with M -ary orthogonal signaling and noncoherent demodulation. The partial-band interference is modeled as a Gaussian process, although some of the results also apply to general (non-Gaussian) …
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Algorithms for channel impairment mitigation in broadband wireless communications
… (ML)-based scheme is proposed for joint interference rejection and symbol detection in FH systems. For SISO/MIMO-OFDM systems, recursive least square (RLS)-based approaches are proposed for joint channel estimation and synchronization in both uncoded and coded transmissions. The …
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Adaptive Antenna Arrays Applied to Position Location
… capabilities. These arrays can be used for interference rejection through spatial filtering, position location through direction finding measurements, and developing improved channel models through angle of arrival channel sounding measurements. This thesis provides an overview of the …
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Simulation of a Wireless Communication Channel to Determine a Best Topology for a Base Station Array Antenna
… array's ability to handle high levels of interference. Even though a diversity combining scheme (MRC) was used in the simulator, the arrays provided interference rejection capabilities due to the closely spaced antenna elements. Though diversity does provide a gain in received signal, …
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