Wireless Receiver Design for Digital Communications
Practical lessons and approaches in radio receiver design for wireless communication systems are the hallmarks of Wireless Receiver Design for Digital Communications, 2nd Edition. Decades of experience at the bench are collected within, and the book acts as a virtual replacement for a mentor who teaches basic concepts from a practical perspective and has the war stories that help their apprentices avoid the mistakes of the past. Readers are led through the fundamental theory in the Basics of RF Engineering chapter and then walked along the path toward applying this knowledge in the design of real world systems. Wireless Receiver Design for Digital Communications, 2nd Edition is a wireless design reference for students and professionals in electrical engineering. It contains extensive chapters on mixers, oscillators, filters, and amplifiers. It details all major components related to receiver design, including cascade interaction, and provides excellent introductions and technical background on basic as well as advanced component characteristics. It is replete with exercises, design examples, illustrations, and proven concepts that help clarify the role of each component within the system design.
Other keywords: digital communication; mixer; radio frequency basics; oscillator; wireless receiver design; antenna; cascade design; propagation; signal; demodulation; filter; noise
- Book DOI: 10.1049/SBTE009E
- Chapter DOI: 10.1049/SBTE009E
- ISBN: 9781891121807
- e-ISBN: 9781613531723
- Page count: 775
- Format: PDF
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Front Matter
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1 Radio Frequency Basics
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There are entire books that deal with statistics, logarithms, significant figures, transmission lines, and s-parameters. We are interested in understanding and designing radio receivers and systems, which requires at least a passing knowledge of all these topics and more. This chapter serves as an introduction to many of the basic concepts we will need in later chapters.
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2 Signals, Noise, and Modulation
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In this chapter, we've examined signals, noise, and various modulated signals in the time, frequency, zero crossing, and phasor domains. As we move on to new material, we will find all of these expressions useful and necessary to explore fully the topics to come.
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3 Propagation
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The propagation characteristics between two geographically fixed sites will change over time; for no apparent reason. Digital eye patterns will open and close; bit-error rates will vary; frequency nulls will appear and disappear. We can often observe daily, monthly, and yearly variations in the propagation characteristics of a channel. In this chapter, we'll explain some of the causes of these effects and offer some solutions.
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4 Antennas
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Antennas serve as our interface between guided wave propagation (a transmission line or a waveguide) and unguided wave propagation (free-space propagation). The authors use a transmitting antenna to launch a signal into free space in the hope that we can receive it at some remote location using a receiving antenna. The authors impress information on the signal, and, if we work things right, we can retrieve that information at the receiving end of the system. In this chapter, the authors will examine the characteristics of antennas as they affect the design of the receiver. The authors examine metrics describing how efficiently antennas launch and receive signals. The authors also discuss antenna properties that help mitigate the unkind effects of unguided propagation. Finally, the authors will develop models that will help us characterize an antenna when we use it in both its transmitting mode and its receiving mode.
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5 Filters
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This chapter deals with the following subjects: low-pass filters; band-pass filters; noise bandwidth; Butterworth filters; and matched filters.
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6 Noise
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Thermal noise places a fundamental limit on the smallest signal a receiving system can process. In this chapter, we will examine noise from a mathematical point of view and then relate our new knowledge to receiving systems.
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7 Linearity
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In Chapter 6, we found that thermal noise set the limit on the smallest signal a receiver can process. Linearity sets the limit on the largest signal we can process. If we apply too large of a signal into a system, the system will alter or distort the signal, rendering it unusable.
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8 Mixers
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This chapter discusses the operation and frequency translation mechanisms of mixers for radio receivers.
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9 Oscillators
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Oscillators play an important part in the ultimate performance of receivers. In this chapter, we will examine oscillator phase noise, frequency accuracy, and drift and their cumulative effects on receiver performance.
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10 Cascade Design
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In this chapter, the author discusses the art of receiver design. This chapter is largely about engineering trade-offs. The author discusses the interaction of filters, component noise, component linearity, mixers, oscillators, and transmission lines in cascade. The authors will first examine gain distribution in a cascade of components. The authors will then discuss frequency planning and conversion schemes in detail. Finally, the authors will look at some example designs.
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11 Digitizing
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An analog-to-digital converter (ADC) converts a signal from its continuous analog representation into a series of finite-resolution samples taken at discrete instances in time. In an ideal receiver, we would place the ADC directly at the antenna to minimize the effects of receiver noise, nonlinearities, and spurious signals. This architecture is not yet practical, so we must first translate the frequency band of interest to a frequency compatible with the ADC input. We must also amplify the antenna output to make use of the ADC's full range. Sampling resolution (i.e., number of bits in the ADC) and sampling rate are the primary ADC parameters we specify. There are also the issues of ADC saturation, nonlinear ADC response, and sampling jitter.
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12 Demodulation
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Demodulation is the process of recovering the transmitter's symbol stream from the received signal. There are entire books devoted to demodulation, so a single chapter in this book has no hope of covering the topic adequately. Our goal is describe, in broad strokes, the nature of the received signal and some introductory methods we might use to compensate for the corruption of the signal by the propagation environment, oscillator inaccuracies, and other effects. We will examine only continuous quadrature amplitude modulation (QAM)-type signals in this chapter. The propagation path through which the signal travels exhibits a variable time delay, multipath, and signal power loss. These parameters will change with time. The oscillators in the receiver and transmitter exhibit frequency drift that causes the received signal to appear at an incorrect frequency and baud rate. The time delay of the propagation path and the oscillator inaccuracies cause the phase of the received signal to be indeterminate and varying. At the receiver, we wish to measure the precise phase and amplitude of a constellation point. That is our received symbol. The (considerable) task of the demodulator is to remove the ambiguities (amplitude, frequency, and phase) of the arrived signal and allow the symbol decision to proceed with accuracy.
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Appendix
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Back Matter
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Supplementary material
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Instructor Resources for "Wireless Receiver Design for Digital Communications, 2nd edition"
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Solutions to the exercises in this book are available for instructors who have adopted the book for a course.
To request an Instructor Pack, please email [email protected], including details of your institution and the course you are teaching.
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