An OFDM signal transmission apparatus is provided, which includes a mapping unit configured to map first signals into N subcarriers and second signals into M subcarrier(s) to form an OFDM signal, wherein N is larger than M. The first signals are each indicating a same bit of retransmission information and the second signals are each indicating a same bit of information other than retransmission information. The OFDM signal transmission apparatus further includes a transmitting unit configured to transmit the formed OFDM signal.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A signal reception apparatus, comprising: receiving circuitry, which, in operation, receives signals generated by identical bit information, the received signals being mapped onto at least two subcarriers in a symbol; Fast Fourier Transform (FFT) circuitry, which in operation, performs FFT processing on the received signals; and signal extraction circuitry, which, in operation, extracts the identical bit information from the FFT processed signals; wherein the at least two subcarriers include a DC subcarrier and one of the received signals generated by the identical bit information is mapped onto the DC subcarrier.
2. The signal reception apparatus according to claim 1 , wherein the identical bit information corresponds to important information.
3. A signal reception method comprising: receiving signals generated by identical bit information, the received signals being mapped onto at least two subcarriers in a symbol; performing Fast Fourier Transform (FFT) processing on the received signals; and extracting the identical bit information from the FFT processed signals; wherein the at least two subcarriers include a DC subcarrier and one of the received signals generated by the identical bit information is mapped onto the DC subcarrier.
4. The signal reception method according to claim 3 , wherein the identical bit information corresponds to important information.
5. The signal reception method of claim 3 wherein the identical bit information corresponds to control information.
6. The signal reception method of claim 5 , comprising using the extracted bit information to control retransmissions.
7. The signal reception apparatus of claim 1 wherein the identical bit information corresponds to control information.
8. The signal reception apparatus of claim 1 , comprising control circuitry, which, in operation, uses the extracted bit information to control retransmissions.
9. A communication apparatus, comprising: a receiver, which, in operation: receives signals generated by identical bit information, the received signals being mapped onto at least two subcarriers in a symbol; performs Fast Fourier Transform (FFT) processing on the received signals; and extracts bit information from the FFT processed signals, wherein the at least two subcarriers include a DC subcarrier and one of the received signals generated by the identical bit information is mapped onto the DC subcarrier; and a transmitter, which, in operation, transmits signals.
10. The communication apparatus according to claim 9 , wherein the identical bit information corresponds to important information.
11. The communication apparatus of claim 9 wherein the identical bit information corresponds to control information.
12. The communication apparatus of claim 9 , comprising control circuitry, which, in operation, uses the extracted bit information to control at least one of the receiver and the transmitter.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
April 9, 2014
February 23, 2016
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