초록 ▼

A communication system (100) encodes and decodes information utilizing at least four modulation levels for transmitting the information as symbols representing symbol bits in symbol bit positions. At least one of the symbol bit positions exhibits an error rate higher than that of another of the posi

A communication system (100) encodes and decodes information utilizing at least four modulation levels for transmitting the information as symbols representing symbol bits in symbol bit positions. At least one of the symbol bit positions exhibits an error rate higher than that of another of the positions. A processor (204) encodes (702) the information into an even number of code words and transmits the code words as an interleaved data stream. The processor (204) rearranges (706, 708) the transmission order of the code word bits in a predetermined way to form a modified transmission order such that the code words are transmitted (710) with substantially equal error rates. A receiver (110) receives and demodulates (712) the interleaved data stream to derive the code word bits, and then reorders (714, 716) the code word bits to undo bit modifications resulting from the modified transmission order, thereby restoring the code words. The receiver then decodes the code words to recover the information.

대표청구항 ▼

A method for encoding and decoding information in a digital communication system utilizing at least four modulation levels for transmitting said information as symbols, each symbol representing a plurality of symbol bits positioned in a plurality of symbol bit positions, at least one of which exhibi

A method for encoding and decoding information in a digital communication system utilizing at least four modulation levels for transmitting said information as symbols, each symbol representing a plurality of symbol bits positioned in a plurality of symbol bit positions, at least one of which exhibits an error rate higher than that of another of the plurality of symbol bit positions, the method comprising the steps of: encoding said information into an even-numbered plurality of code words comprising a plurality of code word bits positioned in a plurality of code word bit positions; transmitting said even-numbered plurality of code words as an interleaved data stream, wherein a transmission order of said plurality of code word bits is rearranged in a predetermined way to form a modified transmission order such that said plurality of code word bits corresponding to each of said plurality of code words are transmitted with substantially equal distribution in each of said plurality of symbol bit positions; receiving said interleaved data stream to derive said plurality of code word bits; reordering said plurality of code word bits after reception to undo bit modifications resulting from the modified transmission order, thereby restoring said plurality of code words; and decoding said plurality of code words after restoration to recover said information.