Soft decision method on the high order modulation for the iterative decoder and error correction apparatus using it

1. the art that the invention defined in the claims The present invention relates to a high-order modulation will soft-decision de-mapping method and the error correction apparatus using the same in a suitable manner for the iterative decoder. 2. SUMMARY trying to invention solve this The present invention is a soft decision bits distributed manner, reducing the burden on the hardware amount of computation without the degradation of BER performance, complex index computation and avoid the log operation of the Shannon limit, which can easily obtain a decision bit year using implementable comparison operation that aims to provide a suitable soft-decision de-mapping method and the error correction using the same apparatus in proximity of digital wireless communication system that requires the capability to. 3. Resolution gist of the invention, The present invention, 2 In the N-bit most significant bit of the received signal symbols (the first bit) to the soft decision tenderness, the first bit is 0, the distance values (P In the second bit of the N bits of received signal symbols to soft decision tenderness, two steps to obtain the difference between the maximum value and the maximum value of the second bit is 1, the distance value of the second bit is 0, the distance values (P And the N in the predetermined second bit of the received signal symbols in tenderness soft decision, the predetermined second bit is 0, the distance values (P 4. An important use of the invention, The invention yiyongdoem such digital wireless communications systems. The Shannon limit, higher order modulation, repetition codes, demapper, LDPC, LLR