RADIO COMMUNICATION METHOD, RADIO COMMUNICATION SYSTEM, AND RADIO TRANSMISSION APPARATUS
1 Assignment
0 Petitions
Accused Products
Abstract
A transmission apparatus according to the present invention includes: an encoding section; a modulation section; a variable-SF spreading section that performs spreading with variable SF according to control information A from a control section; an IDFT section that performs IDFT on output from the spreading section; a GI inserting section; a parallel/serial conversion section that converts output from the GI inserting section into a serial data sequence; a digital/analog conversion section; and an RF section that transmits a signal from an antenna after converting the signal to a frequency band for analog signal transmission and controlling it to an appropriate transmission power. The control section is configured to generate control information A for determining the variable SF and input the information A to the variable-SF spreading section and the RF section. In control information A, SF is varied depending on transmission power required.
54 Citations
27 Claims
-
1-18. -18. (canceled)
-
19. A transmission apparatus for use in CDM-OFDMA transmission in which data is transmitted with a combination of a CDM scheme and an OFDMA scheme which is composed of a plurality of time/frequency sub-channels, the transmission apparatus comprising:
-
a variable-gain amplifier for adjusting transmission power; a variable-spreading-factor spreading section for spreading transmission data across a plurality of sub-carriers in accordance with a spreading factor using a rotation orthogonal code, for each frequency sub-channel; and a control section for controlling an amplification factor of the variable-gain amplifier and the spreading factor of the variable-spreading-factor spreading section. - View Dependent Claims (20, 21, 22, 23, 24, 25)
-
-
26. A CDM-OFDMA transmission method for transmitting data with a combination of a CDM scheme and an OFDMA scheme which is composed of a plurality of time/frequency sub-channels, the method comprising:
a step of using a rotation orthogonal code as a spreading code for use in frequency spreading in the CDM scheme and setting a spreading factor in accordance with transmission power for each frequency sub-channel. - View Dependent Claims (27)
Specification