Satellite Communications, Fourth Edition by Dennis Roddy

Author:Dennis Roddy
Language: eng
Format: epub, pdf
Published: 2018-11-13T16:00:00+00:00

11.6 Concatenated Codes

Codes designed to correct for burst errors can be combined with codes designed to correct for random errors, a process known as concatenation. Figure 11.6 shows the general form for concatenated codes. The input data are fed into the encoder designed for burst error correction. This is the outer encoder. The output from the outer encoder is fed into the encoder designed for random error correction. This is the inner encoder. The signal is then modulated and passed on for transmission. At the receiver, the signal is demodulated. The inner decoder matches the inner encoder and follows the demodulator. The output from the inner decoder is fed into the outer decoder, which matches the outer encoder. The term outer refers to the outermost encoding/decoding units in the equipment chain, and the term inner refers to the innermost encoding/decoding unit. In digital satellite television, the outer code is a R-S code, and the inner code is a convolutional code. The inner decoder utilizes Viterbi decoding.

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