C. D'Amours (Canada)
Spread spectrum communications, Error correction coding, Sequences, Forward error correction
Parity bits of a systematic block code are used to select the spreading sequence from a set of orthogonal pseudonoise (PN) sequences. The information bits are then spread by this spreading sequence. At the receiver, the spreading sequence employed is determined from the outputs of the filters that are matched to each PN sequence. This determines the parity bits of the received word. The information bits are then determined from the output of the specific matched filter. Error correction is then performed by assuming that the parity bits are correct. By employing parity bit selected PN sequences, the bit error rate (BER) performance of a direct sequence spread spectrum system is improved compared to a conventional spread spectrum system.
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