Download PDF by Ulrich L. Rohde, Jerry C. Whitaker, Hans Zahnd: Communications Receivers. Principles and Design

By Ulrich L. Rohde, Jerry C. Whitaker, Hans Zahnd

ISBN-10: 0071843337

ISBN-13: 9780071843331

This completely up-to-date advisor deals entire factors of the technological know-how in the back of today’s radio receivers in addition to useful counsel on designing, developing, and protecting real-world communications structures. you are going to discover approach making plans, antennas and antenna coupling, amplifiers and achieve regulate, filters, mixers, demodulation, electronic verbal exchange, and the most recent software program outlined radio (SDR) expertise.

Written by way of a workforce of telecommunication specialists, Communications Receivers: ideas and layout, Fourth version, good points technical illustrations, schematic diagrams, and distinct examples.

Coverage includes:

• uncomplicated radio considerations
• Radio receiver characteristics
• Receiver process planning
• Receiver implementation considerations
• RF and baseband ideas for Software-Defined Radios
• Transceiver SDR considerations
• Antennas and antenna coupling
• Mixers
• Frequency assets and control
• Ancillary receiver circuits
• functionality size

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Extra resources for Communications Receivers. Principles and Design

Example text

33 Examples of AM PSK constellations: (a) type I, independent amplitude and phase decisions; (b) type II, phase decision levels depend on amplitude; (c) type III, uniform square decision areas. A few of these systems are summarized here. Two similar modulation processes are referred to as tamed frequency modulation (TFM) and gaussian filtered MSK (GMSK). For this reason, the term correlative coding has been applied to such techniques. Generally speaking, by selecting a good set of phase trajectories longer than the keying period and by using correlation or Viterbi decoding in the demodulation process, both narrower bandwidths and better performance can be achieved than for conventional MSK.

28 Spectrum occupancy of binary PSK with various transition shapings. 29 Spectrum occupancy for quaternary PSK with various transition shapings. 30 Spectra of binary FSK with sharp transitions. 32 Band occupancy for minimum-shift keying (MSK) with transition shaping. To ameliorate this difficulty, offsetting the reference between symbols can be employed. After filtering and limiting to provide a continuous-phase constant-envelope signal, the offset-keyed quaternary PSK signal is almost indistinguishable from MSK.

HIDM and other adaptive DM systems have been found to be of value for both speech and video communications. 17 Block diagram of a HIDM system. 18 Comparison of responses of HIDM and DM to a step function. In most applications m is made a power of 2, so this conversion is simple. Alternatively, the occupied bandwidth required to send a certain standard digital rate is often used. Some techniques that improve the signal transmission, such as correlative coding, are considered modulation techniques.

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Communications Receivers. Principles and Design by Ulrich L. Rohde, Jerry C. Whitaker, Hans Zahnd

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