| US 7,558,223 B2 | ||
| OFDM receiving method of OFDM receiver for receiving an OFDM signal via a plurality of space paths | ||
| Naganori Shirakata, Ibaraki (Japan); Koichiro Tanaka, Takaraduka (Japan); and Shuya Hosokawa, Hirakata (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Apr. 03, 2006, as Appl. No. 11/395,153. | ||
| Claims priority of application No. 2005-107242 (JP), filed on Apr. 04, 2005. | ||
| Prior Publication US 2006/0221808 A1, Oct. 05, 2006 | ||
| Int. Cl. H04J 3/06 (2006.01); H04J 3/12 (2006.01) | ||
| U.S. Cl. 370—280 [370/507; 370/526] | 8 Claims |
| 1. An OFDM receiving method for receiving an OFDM signal via a plurality of space paths using a plurality of receiver antennas,
the OFDM signal being transmitted from at least one transmitter antenna and including a plurality of subcarriers orthogonal
to each other, the subcarriers including a data carrier which is assigned transmit data and a pilot carrier which is assigned
a known phase and a known amplitude, the method comprising:
OFDM-demodulating each of the OFDM signals received by the plurality of receiver antennas into a plurality of receive subcarriers;
estimating propagation coefficients of the plurality of space paths based on the plurality of receive subcarriers;
calculating an inverse matrix of a propagation matrix whose elements are the estimated propagation coefficients;
performing interference cancellation for the plurality of receive subcarriers by using the inverse matrix, and estimating
transmit subcarriers multiplexed in space;
calculating a reliability of the inverse matrix;
extracting the pilot carrier from the estimated transmit subcarriers, and weighting the extracted pilot carrier according
to the reliability; and
correcting an error included in the plurality of receive subcarriers based on the weighted pilot carrier, wherein the correcting
step includes:
a step of estimating a temporal variation of a demodulation error of a pilot carrier by using the weighted pilot carrier;
a step of estimating a temporal variation of the demodulation error for each subcarrier by interpolating the estimated temporal
variation in a frequency direction; and
a step of correcting the estimated propagation coefficients based on the estimated temporal variation of the demodulation
error for each subcarrier.
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