| 摘要 |
PCT No. PCT/GB91/01259 Sec. 371 Date Mar. 22, 1993 Sec. 102(e) Date Mar. 22, 1993 PCT Filed Jul. 26, 1991 PCT Pub. No. WO92/02092 PCT Pub. Date Feb. 6, 1992.A block of output symbols is generated, using quadrature amplitude modulation, from a block of input bits. The input bits are processed, using one or more redundant codes having a Hamming distance greater than one, to produce digital words which control the in-phase components and digital words which control the quadrature components of the output symbols. A group of bits generated by a single coding step supplies bits for both types of digital word, thereby enabling that coding step to process simultaneously a larger number of bits than would be the case if separate coding were used for producing the two types of word. |
