Patent ID: 8416867

Claim:
A single carrier frequency division multiple access (SC-FDMA) system comprising: a receiving data forming unit configured to form channel estimation values and receive data of a plurality of terminals with receiving signals transmitted from respective terminals, wherein the receiving signals include cyclic prefixes (CPs), cyclic redundancy codes (CRCs) and subcarriers; a selective output unit configured to classify the data of a plurality of terminals into first received data and second received data, wherein the first received data has lower reliability and the second received data has higher reliability than the first received data; an interference signal generating unit configured to form interference signals from the second received data based on the channel estimation value; and a single input multiple output (SIMO) receiving unit configured to remove the interference signals from the first received data and to transmit the interference free first received data to an upper layer, wherein the receiving data forming unit comprises: a CP removing unit configured to remove CPs included in the receiving signals of a time-domain; a fast Fourier transforming (FFT) unit configured to form conversion signals by performing a transformation from the time-domain to a frequency-domain; a subcarrier demapping unit configured to form demapping signals by extracting the subcarriers from the conversion signals; a channel estimating unit configured to receive the demapping signals and to estimate channel values of every terminal; a multi-user multiple input multiple output (MU-MIMO) equalizing unit configured to receive the channel values estimated by the channel estimating unit and the demapping signals, and to form first channel compensation signals; inverse discrete Fourier transforming (IDFT) units configured to transform from the frequency-domain to the time-domain for the channel compensation signals; demodulating units configured to demodulate the channel compensation signals in the time-domain to form demodulation signals; and decoding units configured to decode the demodulation signals to form the data of a plurality of terminals.