| US 7,616,608 B2 | ||
| OFDM-CDMA transmission device and OFDM-CDMA transmission method | ||
| Hiroaki Sudo, Yokohama (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Appl. No. 10/502,091 PCT Filed Aug. 11, 2003, PCT No. PCT/JP03/10202 § 371(c)(1), (2), (4) Date Jul. 22, 2004, PCT Pub. No. WO2004/019532, PCT Pub. Date Mar. 04, 2004. |
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| Claims priority of application No. 2002-244309 (JP), filed on Aug. 23, 2002; and application No. 2002-244310 (JP), filed on Aug. 23, 2002. | ||
| Prior Publication US 2005/0163082 A1, Jul. 28, 2005 | ||
| Int. Cl. H04B 7/216 (2006.01); H04B 7/208 (2006.01); H04J 3/00 (2006.01) | ||
| U.S. Cl. 370—335 [370/344; 370/345] | 14 Claims |
| 1. An OFDM-CDMA transmitting apparatus comprising:
a spreading section that spreads transmit symbols and makes a spreading ratio of a specific transmit symbol larger than a
spreading ratio of other transmit symbols;
a number of multiplexing selection section that selects a number of multiplexing for each transmit symbol and makes a number
of multiplexing for the specific transmit symbol smaller than a number of multiplexing for the other transmit symbols;
a multiplexing section that multiplexes spread signals of said each transmit symbol by the selected number of multiplexing;
and
an orthogonal frequency division multiplexing section that distributes the multiplexed spread signals to a plurality of subcarriers
and distributes at least one of chips of the specific transmit symbol whose number of multiplexing has been reduced and chips
of the specific transmit symbol whose spreading ratio has been increased, only to subcarriers in a time domain, among subcarriers
in a frequency domain, subcarriers in the frequency domain and the time domain, and the subcarriers in the time domain, without
widening a frequency band.
|