Due to these limitations, the wireless channel has a shape of a narrow pipe that obstructs fast data flow, and it is difficult to design an effective bandwidth of wireless communication providing high-speed data transmission. To cope with such a demand, wireless service providers and wireless equipment manufacturers attempt to improve a data transfer rate of a wireless system, which results in motivating massive researches.Ī wireless channel experiences various problems such as path loss, shadowing, fading, noise, limited bandwidth, power limit of a user equipment (UE), and interference between other users. Further, an evolution from a wireless voice service to a wireless data service requires a gradual increase of wireless capacity. Recently, there has been an explosive increase in the demand for wireless data services. The present invention relates to wireless communications, and more particularly, to an apparatus and method for data transmission using transmit diversity in a single carrier-frequency division multiple access (SC-FDMA) system.
13, 2008, and claims the benefit of Korean Application No. 26, 2009, which claims the benefit of U.S. The present application is a national stage of PCT International Application No. STBC is effectively applied to a SC-FDMA system to decrease a peak-to-average power ratio (PAPR) and to maintain a single-carrier property. The apparatus includes a data processor encoding an information bit and generating a modulation symbol by performing constellation mapping on the encoded information bit, a discrete Fourier transform (DFT) unit performing DFT on the modulation symbol to generate a frequency-domain symbol, a space time block coding (STBC) processor performing STBC on the frequency-domain symbol to generate an STBC code consisting of 1st and 2nd STBC streams, a subcarrier mapper mapping the 1st STBC stream to a 1st subcarrier and mapping the 2nd STBC stream to a 2nd subcarrier, an inverse fast Fourier transform (IFFT) unit performing IFFT on the 1st subcarrier to generate a 1st single carrier-frequency division multiple access (SC-FDMA) symbol and performing IFFT on the 2nd subcarrier to generate a 2nd SC-FDMA symbol, and a plurality of transmit antennas transmitting the 1st and 2nd SC-FDMA symbols. An apparatus for data transmission is provided.
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