Patent ID: 7545872
Filing Date: 2009-06-09
Classification: H04H,H04L

Abstract:
1. A receiving apparatus for multiplex communication based on multi-carrier modulation in which a plurality of channels of subcarriers are cyclically arranged, the receiving apparatus comprising: receiving means for receiving a group of multi-carrier modulated signals; switching means for switching the group of signals; buffer means for holding the group of multi-carrier modulated signals received by the receiving means; a filter apparatus connected after the switching means for selecting and outputting a subgroup of signals from the group of signals; orthogonal transforming means for orthogonally transforming the subgroup of signals output by the filter apparatus; and decoding means for decoding the orthogonally transformed subgroup of signals, wherein the switching means transmits one symbol of the subgroup of signals to the filter apparatus and transmits the group of signals held by the buffer means to the filter apparatus after transmitting the one symbol to the filter apparatus, and the filter apparatus selects and outputs a designated subcarrier from the group of signals input via the switching means, wherein the filter apparatus includes: a signal component demultiplexing apparatus having a plurality of branching circuits connected in stages and hierarchically by a branching method, each branching circuit including a symbol delaying means for delaying an input group of signals by N/2 signal selecting means for selecting and outputting a group of symbols of a specific subcarrier from among the symbol strings demultiplexed by the signal component demultiplexing apparatus; and frequency offset compensating means for compensating for a frequency offset of the group of symbols selected and output by the signal selecting means.