Digital Communication Techniques by Christian Gontrand

Author:Christian Gontrand [Christian Gontrand]
Language: eng
Format: epub, pdf
Publisher: Wiley-ISTE
Published: 2020-04-27T16:00:00+00:00

1.16.1. A digital communications receiver

The receiver is similar to the transmitter, but in reverse. The arriving signal is “down converted” to an “IF” and demodulated. The ability to demodulate the signal is hampered by factors including atmospheric noise; the signals and multiple paths compete with one another, indeed destroy one another and disappear.

Figure 1.101. At the receiver: demodulation

In general, demodulation involves the following stages:

1) re-establishing the carrier frequency (carrier lock);

2) re-establishing the symbol clock;

3) decomposition of the signal into I and Q components;

4) determining the I and Q values for each symbol slicing;

5) decoding and interleaving;

6) expansion of bit flow;

7) digital-analog conversion, if it takes place.

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