Aeronautical Radio Communication Systems and Networks by Dale Stacey

By Dale Stacey

Content material:
Chapter 1 advent (pages 1–8):
Chapter 2 thought Governing Aeronautical Radio platforms (pages 9–104):
Chapter three VHF verbal exchange (pages 105–144):
Chapter four army conversation platforms (pages 145–156):
Chapter five Long?Distance cellular Communications (pages 157–175):
Chapter 6 Aeronautical Telemetry platforms (pages 177–186):
Chapter 7 Terrestrial Backhaul and the Aeronautical Telecommunications community (pages 187–199):
Chapter eight destiny Aeronautical cellular verbal exchange platforms (pages 201–219):
Chapter nine The Economics of Radio (pages 221–227):
Chapter 10 floor Installations and gear (pages 229–257):
Chapter eleven Avionics (pages 259–305):
Chapter 12 Interference, Electromagnetic Compatibility, Spectrum administration and Frequency administration (pages 307–324):

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Extra info for Aeronautical Radio Communication Systems and Networks

Example text

Required range of propagation; frequency of operation and propagation properties; spectral efficiency; equipment complexity, reliability, size weight and cost; required data or voice throughput rate; regulatory constraints. 27 The modulation conundrum. 27) There is a relationship between all of these aspects (mathematically it is Shannon’s law; see later), and it is usually necessary to trade off one requirement against the others to achieve the best overall engineering solution. In reality, for low-specification systems where performance is not so critical, rugged and rudimentary low-order modulation schemes can work very efficiently, and this keeps cost and complexity down.

It is twice as bandwidth efficient as the DSB-AM system. Disadvantages of SSB-AM: r r More sophisticated demodulation is required (coherent detector with PLL, costas loop). It can be prone to phase distortions (due to Tx and Rx oscillators beating and changing), so high oscillator specification is required at both ends. Not really heard by listeners (quality not high). 4 The Aeronautical HF System and Other SSB Systems These use SSB modulation for reasons of spectral efficiency and a limited resource.

The same information is carried by both. By removing one of the sidebands and by removing the carrier, therefore, no information is lost and the SNR (signal-to-noise ratio) increases for a given transmit power as all the transmitted energy is concentrated into the information signal. 34). The construction of an SSB is fractionally more complicated than that of DSB-AM. It can be in synthesized two different ways. Method 1. 35, a SSB signal can be synthesized either by using basic DSB-AM or DSB-SC-AM modulator and filtering out the unwanted carrier and sideband (usually done at a IF).

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