Patent ID: 6288631
Filing Date: 2001-09-11
Classification: H04B,H04L

Abstract:
A power-line carrier communications system in which a power-line is used for a transmission path, and a symbol is transmitted from a transmitting apparatus to a reception apparatus, whereinsaid transmission apparatus comprises:interleave means for shuffling m symbols (where m is an integer of 2 or more) in a unit of symbol stream in n ways (where n is an integer of 2 or more) and generating n-type symbol streams in which 1st to mth symbols are shuffled;modulation means for subjecting said n-type symbol streams generated by said interleave means to amplitude-modulation and/or phase-modulation in such a manner as to randomly distribute each symbol on both time and frequency axes by using predetermined carriers each corresponding thereto, and outputting the same as modulated signals; andtransmission amplifier means for amplifying said modulated signals to be in a predetermined amplitude, and outputting the same to said transmission path, andsaid reception apparatus comprises:reception amplifier means for amplifying, to be in a predetermined amplitude, and outputting the modulated signals received through said transmission path;demodulation means for subjecting the modulated signals outputted from said reception amplifier means to amplitude-modulation and/or phase-demodulation by using predetermined reference carriers each corresponding thereto, and then generating n-type amplitude/phase information streams;de-interleave means for unshuffling the symbols in said n-type amplitude/phase information streams generated by said demodulation means in an inverse manner to the interleave means, and then outputting the unshuffled n-type amplitude/phase information streams; anddetermination means for determining a value respectively for said 1st to mth symbols according to each information on said unshuffled n-type amplitude/phase information streams outputted from said de-interleave means.