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 29 for “"noncoherent"”.
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Noncoherent Communication Over Fading Channels
Finally, we consider signaling designs for a high SNR, high mobility communication scenario. For a Gauss-Markov Rayleigh fading channel, we derive upper and lower bounds for the mutual information generated by the Gaussian input distribution. The upper bound shows that the mutual information …
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A Framework for Spectrally Efficient Noncoherent Communication
"This thesis considers noncoherent communication over a frequency-nonselective channel in which the time-varying channel gain is unknown a priori , but is approximately constant over a coherence interval . Unless the coherence interval is large, coherent communication, which requires explicit …
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Error-rates of digital signaling with coherent and noncoherent detections
… in additive Gaussian noise. Both coherent and noncoherent detection schemes are considered. A symbol error-rate or probability of error is used as the performance criterion for comparison purpose.
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Trellis-coded permutation modulation for improved performance of narrowband noncoherent FSK
Noncoherent modulation is an important technique in wireless communication systems. Although noncoherent modulation usually does not perform as well as its coherent counterpart it is practical and useful in some applications, such as paging systems. In this thesis we investigate ways to improve the …
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Performance analysis of the Link-16/JTIDS waveform with concatenated coding, soft decision Reed Solomon decoding and noise-normalization
… with noise-normalization. Both coherent and noncoherent detection are considered. Based on the analyses, the alternative JTIDS waveform outperforms the original in all cases considered. When only additive white Gaussian noise is present, the best performances, which result in a gain of about …
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Digital ADCs and ultra-wideband RF circuits for energy constrained wireless applications by Denis Clarke Daly.
… thesis expands in scope to describe a pulsed, noncoherent ultra-wideband transceiver chipset, implemented in 90 nm CMOS and operating in the 3-to-5 GHz band. The all-digital transmitter employs capacitive combining and pulse shaping in the power amplifier to meet the FCC spectral mask without …
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Spread spectrum satellite multiple access and overlay service
… multiple access systems which use a form of noncoherent M-ary FSK (MFSK) as the primary modulation and analyzes their throughput. The analysis considers such factors as satellite power constraints and adjacent satellite interference. It considers the effect of onâ board processing on the …
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Diversity Combining for Frequency-Hop Spread-Spectrum Communications With Partial-Band Interference and Fading (anti-Jam)
… 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) partial-band interference. The performance measures we use to evaluate the diversity …
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Performance of a wideband CDMA system under multipath fading
… probability of bit error of an asynchronous, noncoherent, direct-sequence, code-division multiple-access (CDMA) system using wideband M-ary FSK as bandpass modulation. The immediate analysis and determination of the average probability of bit error is made inherently more difficult because of …
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Target localization in MIMO radar systems
… accuracy is developed for both coherent and noncoherent processing. The CRLB is shown to be inversely proportional to the signal effective bandwidth in the noncoherent case, but is approximately inversely proportional to the carrier frequency in the coherent case. It is shown that …
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Wireless Communications in the Energy -Limited Regime
… to assume any form of CSI. Thus, we consider noncoherent fading channels and characterize the reliability function in the low-SNR regime. Further, by allowing multiple transmit and receive antennas, we study the impact of multiple antennas on the fundamental tradeoff between communication rate …
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Classification and Parameter Estimation of Asynchronously Received PSK/QAM Modulated Signals in Flat-Fading Channels
… is the development of a novel asynchronous and noncoherent modulation classifier for PSK/QAM modulated signals in flat-fading channels. In developing this classifier, a novel estimator for the unknown channel gain and fractional time delay is proposed which uses a method-of-moments based …
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Analysis of Advanced Diversity Receivers for Fading Channels
… reception of differentially coherent and noncoherent digital communications over Nakagami-m channels. Several other applications are also discussed.
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The design of a 94 GHz high resolution coherent radar
… warning sensor for helicopters. The system is a noncoherent pulsed radar with the following specifications:
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Enabling reliable control with communication constraints
… develop a novel signal processing framework for noncoherent communication using ideas from quantum error correction. This leads to the development of a family of full-diversity space-time block codes for multiantenna wireless communications. The codes are specialized to the domain of …
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Design of sparse signaling schemes in fading wideband channels
… lacks practicality due to its maximum likelihood noncoherent receiver being a bank of frequency-selective filters. In this work, we first explore using a chipping sequence-based compressed sensing receiver, which is simpler and more practical than a bank of frequency-selective filters, to recover …
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Communications over fading channels with partial channel information : performance and design criteria
… estimation. When CSI is not available, two noncoherent detection algorithms are formulated based on the generalized likelihood ratio test (GLRT). Numerical results are presented to demonstrate the use of GLRT-based detectors in systems with cooperative diversity.
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Data transmission by pulse compression
… such a theory taking into account coherent and noncoherent single-link and multiplex signalling modes. Some new results concerning the slope-reversal chirp pair are obtained. The LFM technique combines the typical capabilities of pulse compression with a relative ease of implementation. However, …
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Differential MMSE: A New Approach for Adaptive Interference Suppression Over Time-Varying Channels
… wireless fading channel. A classical method for noncoherent communication over such channels is differential modulation and demodulation, which obviates the need to track amplitude and phase by exploiting the fact that channel variations over successive symbols are negligible. However, there are …
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