Apparatus for transmission and reception with transmit diversity using cyclic subcarrier shift
AssigneeElectronics and Telecommunications Research Institute
InventorsByung Jang Jeong, Taegyun Noh, Young Jo Ko, Jae Young Ahn
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Abstract
Provided is a technology adopting multiple transmit antennas in a radio communication system. In a mobile communication system of a signal carrier frequency division multiple access (SC-FDMA) scheme, it is possible to transmit data using the multiple transmit antennas, while maintaining a peak to average power ratio (PAPR) to be low. Also, it is possible to provide a new transmit diversity transmission even in a general radio communication system including an orthogonal frequency division multiple access (OFDMA), a code division multiple access (CDMA) scheme, and the like.
Claims15
A transmission apparatus comprising:
- a discrete Fourier transform (DFT) spreader to perform a DFT for a modulated symbol to generate frequency domain symbols;
- a resource mapper to map the frequency domain symbols and a plurality of frequency domain streams;
- a cyclic shift unit to perform a cyclic shift for each of the mapped frequency domain streams according to a cyclic shift value that is determined with respect to each of the frequency domain streams;
- and
- a transmitter to perform an inverse DFT (IDFT) for the cyclic shifted frequency domain streams to generate a plurality of time domain streams, and to transmit the time domain streams to a reception apparatus using a transmit antenna corresponding to each of the time domain streams.
A transmission apparatus comprising:
- a DFT spreader to perform a DFT for a modulated symbol to generate frequency domain symbols;
- a resource mapper to map the frequency domain symbols and a plurality of frequency domain streams;
- an IDFT despreader to perform an IDFT for the frequency domain streams to generate a plurality of time domain streams;
- a phase shift unit to perform a phase shift for each of the time domain streams according to a phase shift value that is determined with respect to each of the time domain streams;
- and
- a transmitter to transmit the phase-shifted time domain stream to a reception apparatus using a transmit antenna corresponding to each of the time domain streams.
A reception apparatus comprising:
- a receiver to receive, from a transmission apparatus, a plurality of time domain streams that are cyclic shifted according to different cyclic shift values, and to perform a DFT for the time domain streams to generate frequency domain streams corresponding to the time domain streams;
- a frequency domain equalizer to equalize the frequency domain streams;
- and
- an IDFT despreader to perform an IDFT for the equalized frequency domain streams to generate a time domain symbol.
Dependencies are inferred from the claim text.