| US 7,545,872 B2 | ||
| Signal component demultiplexing apparatus, filter apparatus, receiving apparatus, communication apparatus, and communication method | ||
| Kazuyuki Sakoda, Tokyo (Japan) | ||
| Assigned to Sony Corporation, (Japan) | ||
| Filed on Nov. 03, 2006, as Appl. No. 11/592,422. | ||
| Application 11/592422 is a division of application No. 10/926190, filed on Aug. 25, 2004, granted, now 7,133,458. | ||
| Application 10/926190 is a division of application No. 09/783809, filed on Feb. 15, 2001, granted, now 6,816,555. | ||
| Claims priority of application No. P2000-046820 (JP), filed on Feb. 18, 2000. | ||
| Prior Publication US 2007/0053457 A1, Mar. 08, 2007 | ||
| Int. Cl. H04K 1/10 (2006.01); H04L 27/28 (2006.01) | ||
| U.S. Cl. 375—260 [375/340; 375/316; 370/341; 370/343] | 6 Claims |
| 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(m+1) symbols, phase offset adjusting means for shifting a phase of the input group of signals by −π(k/2m) radians with a reference of 0 Hz, adding means for adding an output signal of the symbol delaying means and an output signal
of the phase offset adjusting means to calculate one symbol string alternately positioned on a frequency axis in a multiplexed
signal input to signal selecting and outputting means, and subtracting means for subtracting the output signal of the phase
offset adjusting means from the output signal of the symbol delaying means to calculate another symbol string alternately
positioned on the frequency axis in the multiplexed signal input to the signal selecting and outputting means, wherein m is
a parameter indicating a position of a stage of each branching circuit, N is a number of symbols existing within one modulation
time, and k is a parameter indicating that a group of signals having a frequency offset of a subcarrier is input with the
reference of 0 Hz;
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.
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