Download Communications Receivers: DSP, Software Radios, and Design Third Edition By Ulrich L. Rohde and Jerry C. Whitaker

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Introduction

Digital signal processing devices, driven by powerful microprocessors, have reshaped communications technology. Advanced devices permit analog signals to be processed digitally, dramatically reducing or even eliminating circuit alignment and adjustment procedures. The application of digital techniques reaches from the frequency synthesizer to the demodulator. Curiously enough, as digital technology continues to move forward, one of the frontiers of development is the design and manufacture of hybrid analog-digital circuitry on a single chip. Clearly, there are still functions for which analog is superior. Technologies have been developed to allow the generation of digital wave forms shaped arbitrarily within bandwidth constraints. It is thus possible to combine advanced waveforms and modulation schemes, spinoffs of MSK and PSK, to provide secure point-to-point communications at a fraction of the cost of specialized systems just a few years ago. These communications can be made both evasive and adaptive. Thus, the radio system can make a channel-quality analysis and to determine by link analysis the required transmitter power. Because of sounding assigned channels, it is practical to avoid interference and determine the best available frequencies for reliable communications. Many communications links exchange analog and digital voice signals as well as data. Redundancy in the message and forward error-correcting techniques improve reliability and are often essential to protect against interference and jamming. Spread-spectrum techniques are being used to allow the application of correlation schemes for detection. This permits operation below the signal-to-noise-density ratio of conventional systems to reduce detectability. Conversely, such signal processing spreads the received interfering spectrum, so such systems are far more resistant to interference than other services. As a result of these and other developments, radio receivers have undergone a significant change in design. It is for this reason that we felt it was important to produce a new, third edition of Communications Receivers.

Table Of Contents

Chapter No 1: Basic Radio Considerations
Chapter No 2: Radio Receiver Characteristics
Chapter No 3: Receiver System Planning
Chapter No 4: Antennas and Antenna Coupling
Chapter No 5: Amplifiers and Gain Control
Chapter No 6: Mixers
Chapter No 7: Frequency Control and Local Oscillators
Chapter No 8: Demodulation and Demodulates
Chapter No 9: Ancillary Receiver Circuits
Chapter No 10: Receiver Design Trends