Communication device for receiving and transmitting OFDM signals in a wireless communication system
A communication device for transmitting orthogonal frequency division multiplexed (OFDM) signals in a wireless communication system. The device includes a plurality of antenna elements that transmit the OFDM signals to a receiver over a plurality of transmission channels in the wireless communication system. The device also generates weight coefficients applied to each of the plurality of subcarrier signals, and controls an amplitude and/or phase of the plurality of subcarrier signals as a function of said weight coefficients.
1. An electronic device comprising:
circuitry configured to
obtain, based on a received preamble signal, a vector for adjusting a plurality of subcarrier signals;
adjust each of the plurality of subcarrier signals based on the vector;
transform the plurality of subcarrier signals into an orthogonal frequency divisional multiplexed (OFDM) signal using inverse fast Fourier transform (IFFT); and
output the OFDM signal.
2. The electronic device of claim 1 , wherein the vector includes coefficients that are applied to each of the plurality of subcarriers.
3. The electronic device of claim 1 , further comprising:
an antenna.
4. The electronic device of claim 3 , further comprising:
a plurality of antennas.
5. The electronic device of claim 3 , further comprising:
two antennas.
6. The electronic device of claim 1 , wherein the circuitry includes a processor configured to perform at least the adjusting and the transforming.
7. The electronic device of claim 6 , further comprising:
a memory.
8. The electronic device of claim 1 , wherein the circuitry includes a voice codec processor.
9. The electronic device of claim 1 , wherein the circuitry is further configured to:
adjust each of the plurality of subcarrier signals to optimize reception power.
10. The electronic device of claim 1 , wherein the vector is obtained based on a
channel property in accordance with an Eigenvector of a matrix.
11. The transmitting device according to claim 1 , wherein the vector is obtained based on a channel property in accordance with an Eigenvector of a Hermitian matrix.
12. A method comprising:
obtaining, based on a received preamble signal, a vector for adjusting a plurality of subcarrier signals;
adjusting, by circuitry, each of the plurality of subcarrier signals based on the vector;
transforming, by the circuitry, the plurality of subcarrier signals into an orthogonal frequency divisional multiplexed (OFDM) signal using inverse fast Fourier transform (IFFT); and
outputting the OFDM signal.
13. A transmitter comprising:
a plurality of antennas; and
circuitry configured to
obtain, based on a received preamble signal, a vector for adjusting a plurality of subcarrier signals;
adjust each of the plurality of subcarrier signals based on the vector;
transform the plurality of subcarrier signals into an orthogonal frequency divisional multiplexed (OFDM) signal using inverse fast Fourier transform (IFFT); and
output the OFDM signal via the plurality of antennas.