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Author: Kiranraj George Publisher: ISBN: Category : Radio Languages : en Pages : 140
Book Description
The lack of a priori knowledge about the waveform of interest, the multitudes of signals the receiver might receive, and the noise energy that occupies the same portion of the frequency spectrum as the signal makes the design of a modern wideband receiver very challenging. Especially, the receiver must be able to detect a weak signal in the presence of a strong one, which requires a high two-signal instantaneous dynamic range (IDR). To fulfill this requirement, the receiver must detect genuine weak signals and avoid the detection of strong signals’ sidelobes and noise and spurs generated from the receiver system. The other major trend in modern receiver signals is the shift towards wider bandwidths. Analog wideband receiver designs can provide accommodation of the technology-stressing bandwidths, but come up to a cost of reduced flexibility. Digital approaches, alternatively, provide flexibility in receiver signal processing, but they are limited by analog-to-digital converter resolution and power consumption. In this dissertation, design and performance evaluation of a 1-GHz signal bandwidth digital receiver, which uses a Kaiser Window function and a compensation technique, is presented. The Kaiser Window reduces the spectral leakage by eliminating the discontinuities at the time window edges and the compensation uncovers the weak signal for extension of the two-signal IDR of the receiver. An exhaustive study of configuration of ADC, FFT, window function, and compensation for a maximum achievable two-signal IDR of the receiver is conducted. It is shown that using a 4-bit ADC and a 256-point FFT of 12-point kernel function, a maximum two-signal IDR of 9 dB is obtained. The IDR is extended to 14 dB by using the Kaiser window and to 18 dB by using the compensation. Furthermore, using a 4-bit ADC and an ideal 256-point FFT, a maximum two-signal IDR of 11 dB is obtained. The IDR is extended to 17 dB by using the Kaiser window and to 22 dB by using the compensation. A combination of both Kaiser window and compensation techniques extends the two-signal IDR of the receiver to 24 dB by using a 12-point kernel function FFT and 29 dB by using an ideal FFT. A novel hardware implementation of the Kaiser window, the compensation technique, and the receiver design is presented.
Author: Kiranraj George Publisher: ISBN: Category : Radio Languages : en Pages : 140
Book Description
The lack of a priori knowledge about the waveform of interest, the multitudes of signals the receiver might receive, and the noise energy that occupies the same portion of the frequency spectrum as the signal makes the design of a modern wideband receiver very challenging. Especially, the receiver must be able to detect a weak signal in the presence of a strong one, which requires a high two-signal instantaneous dynamic range (IDR). To fulfill this requirement, the receiver must detect genuine weak signals and avoid the detection of strong signals’ sidelobes and noise and spurs generated from the receiver system. The other major trend in modern receiver signals is the shift towards wider bandwidths. Analog wideband receiver designs can provide accommodation of the technology-stressing bandwidths, but come up to a cost of reduced flexibility. Digital approaches, alternatively, provide flexibility in receiver signal processing, but they are limited by analog-to-digital converter resolution and power consumption. In this dissertation, design and performance evaluation of a 1-GHz signal bandwidth digital receiver, which uses a Kaiser Window function and a compensation technique, is presented. The Kaiser Window reduces the spectral leakage by eliminating the discontinuities at the time window edges and the compensation uncovers the weak signal for extension of the two-signal IDR of the receiver. An exhaustive study of configuration of ADC, FFT, window function, and compensation for a maximum achievable two-signal IDR of the receiver is conducted. It is shown that using a 4-bit ADC and a 256-point FFT of 12-point kernel function, a maximum two-signal IDR of 9 dB is obtained. The IDR is extended to 14 dB by using the Kaiser window and to 18 dB by using the compensation. Furthermore, using a 4-bit ADC and an ideal 256-point FFT, a maximum two-signal IDR of 11 dB is obtained. The IDR is extended to 17 dB by using the Kaiser window and to 22 dB by using the compensation. A combination of both Kaiser window and compensation techniques extends the two-signal IDR of the receiver to 24 dB by using a 12-point kernel function FFT and 29 dB by using an ideal FFT. A novel hardware implementation of the Kaiser window, the compensation technique, and the receiver design is presented.
Author: James B. Y. Tsui Publisher: Artech House ISBN: 160807031X Category : Computers Languages : en Pages : 440
Book Description
Offering engineers a thorough examination of special, more advanced aspects of digital wideband receiver design, this practical book builds on fundamental resources on the topic, helping you gain a more comprehensive understanding of the subject. This in-depth volume presents a detailed look at a complete receiver design, including the encoder. Moreover, it discusses the detection of exotic signals and provides authoritative guidance on designing receivers used in electronic warfare. From frequency modulation and biphase shifting keys, to parameter encoders in electronic warfare receivers and the use of the simulation and probability density function to predict the false alarm parameter, this book focuses on critical topics and techniques that help you design digital wideband receivers for top performance. The authoritative reference is supported with over 310 illustrations and more than 180 equations.
Author: James B. Tsui Publisher: SciTech Publishing ISBN: 189112126X Category : Technology & Engineering Languages : en Pages : 608
Book Description
This book is a current, comprehensive design guide for your digital processing work with today's complex receiver systems. This book brings you up-to-date with the latest information on wideband electronic warfare receivers, the ADC testing procedure, frequency channelization and decoding schemes, and the operation of monobit receivers.
Author: Jiaguo Lu Publisher: John Wiley & Sons ISBN: 1119564638 Category : Technology & Engineering Languages : en Pages : 336
Book Description
An authoritative work on Synthetic Aperture Radar system engineering, with key focus on high resolution imaging, moving target indication, and system engineering technology Synthetic Aperture Radar (SAR) is a powerful microwave remote sensing technique that is used to create high resolution two or three-dimensional representations of objects, such as landscapes, independent of weather conditions and sunlight illumination. SAR technology is a multidisciplinary field that involves microwave technology, antenna technology, signal processing, and image information processing. The use of SAR technology continues grow at a rapid pace in a variety of applications such as high-resolution wide-swath observation, multi-azimuth information acquisition, high-temporal information acquisition, 3-D terrain mapping, and image quality improvement. Design Technology of Synthetic Aperture Radar provides detailed coverage of the fundamental concepts, theories, technology, and design of SAR systems and sub-systems. Supported by the author’s over two decades of research and practice experience in the field, this in-depth volume systematically describes SAR design and presents the latest research developments. Providing examination of all topics relevant to SAR—from radar and antenna system design to receiver technology and signal and image information processing—this comprehensive resource: Provides wide-ranging, up-to-date examination of all major topics related to SAR science, systems, and software Includes guidelines to conduct grounding system designs and analysis Offers coverage of all SAR algorithm classes and detailed SAR algorithms suitable for enabling software implementations Surveys SAR and computed imaging literature of the last sixty years Emphasizes high resolution imaging, moving target indication, and system engineering Design Technology of Synthetic Aperture Radar is indispensable for graduate students majoring in SAR system design, microwave antenna, signal and information processing as well as engineers and technicians involved in SAR system techniques.
Author: Feiran Liu Publisher: ISBN: Category : Broadband communication systems Languages : en Pages : 69
Book Description
Fast Fourier transformation (FFT) is widely used in wideband digital receivers to detect multiple signals. To achieve high dynamic range, the receiver has to increase analog-to-digital (ADC) resolution bits, which requires significant computation time and therefore increases receiver time resolution. The other challenge of FFT approach is two signals with a small frequency difference (i.e., less than five FFT frequency bins in most cases) cannot be detected simultaneous. This thesis presents an adaptive thresholding wideband digital receiver to accurately detect two simultaneous high dynamic range signals even when they are close to one FFT frequency bin. The receiver can perform well for more than two input signals if the requirements for the receiver frequency resolution and dynamic range are reduced. The receiver design architecture and performance evaluation are presented.
Author: Alyssa Apsel Publisher: Springer Science & Business Media ISBN: 1461418453 Category : Technology & Engineering Languages : en Pages : 159
Book Description
This book covers the fundamental principles behind the design of ultra-low power radios and how they can form networks to facilitate a variety of applications within healthcare and environmental monitoring, since they may operate for years off a small battery or even harvest energy from the environment. These radios are distinct from conventional radios in that they must operate with very constrained resources and low overhead. This book provides a thorough discussion of the challenges associated with designing radios with such constrained resources, as well as fundamental design concepts and practical approaches to implementing working designs. Coverage includes integrated circuit design, timing and control considerations, fundamental theory behind low power and time domain operation, and network/communication protocol considerations.
Author: Ethan Lin Publisher: ISBN: Category : Compressed sensing (Telecommunication) Languages : en Pages : 89
Book Description
The current state-of the-art for digital receiver bandwidth coverage is now reaching multi-GHz. The conventional wideband digital receiver design is based on the Nyquist information theory, and its bandwidth coverage is limited by the Nyquist sampling rate. Therefore, receiver performance highly depends on the high speed analog-to-digital (ADC) technology and computation hardware such as FPGA. Having proved a fundamental theory that Nyquist waveform can be restored with a reduced sampling rate under certain situations, compressed sensing (CS) technique becomes an attractive solution to wideband digital receiver development. In this dissertation, performance analysis of the compressed sensing in receiver application is conducted. The compressed sensing receiver uses two modulations and sampling schemes: 1) Pseudo Random Code (PRC), a uniform sampling approach, and 2) a proposed non-uniform sampling (NUS) approach. Three algorithms are used to process the compressed signals: 1) Orthogonal Matching Pursuit (OMP), 2) Parameter Estimation (PE), and 3) Nesterov's algorithm (NESTA). Signal detection thresholds for the compressed sensing receivers are determined by Additive white Gaussian noise (AWGN) distribution through probability density function (PDF) using the best fitting analog function for a false alarm rate of 10-7. Remedy algorithms are developed to solve frequency-misread problem caused by CS modulations. Signal detection and sensitivity of the compressed sensing receivers are measured and presented. GPU-accelerated parallel computing is adopted to process the compressed signals. Computing results of OMP and PE from NVIDIA Telsa K-40 GPU are presented.
Author: Tony Chiang Publisher: ISBN: Category : Signal processing Languages : en Pages : 184
Book Description
General purpose receivers of today are designed with a broad bandwidth so that the receiver can accept a wide range of signal frequencies. These receivers usually accept one signal along with any interference that is included. To increase the signal detection capabilities of the wideband receiver, a design for a receiver that can detect two signals is needed. One of the requirements for this receiver is that the second weak signal needs to be processed in a timely manner so that the receiver can recognize it. To remedy the problem, a module was developed using wavelet-based techniques to remove spurs from the incoming signals to allow easier detection. The main basis for this concentration on wavelets comes from the way wavelets break down signals into portions (called resolutions) that allow easier determination of detail importance. Utilizing the multi-resolution attributes of the discrete wavelet transform, a way to remove signal spurs is made possible. When removing the signal noise from the signal, the two signal dynamic range of the system is increased, as this module is applied to multiple receiver systems for comparison of performance. Implementation of this system was originally done in C as well as MATLAB, but later is being implemented in VHDL with simulations done for verification of functionality.
Author: Kiranraj George
Author: Kiranraj George
Author: 
Author: James B. Y. Tsui
Author: James B. Tsui
Author: Jiaguo Lu
Author: Feiran Liu
Author: Alyssa Apsel
Author: Ethan Lin
Author: Tony Chiang
Author: