Single user detection base station

A time division duplex using code division multiple access base station, the base station receiving a plurality of data signals in a time slot, each data signal experiencing a similar channel response, the base station comprising:

• an antenna for receiving radio frequency signals including the plurality of data signals;
• a demodulator for demodulating radio frequency signals to produce a baseband signal;
• a channel estimation device for estimating the similar channel response;
• and
• a data detector device for constructing a channel correlation matrix representing a channel of the data signals based on in part the estimated channel response, determining a spread data vector based on in part a fast fourier transform (FFT) decomposition of a circulant version of the channel correlation matrix, and despreading the spread data vector to recover data from the received combined signal.

A time division duplex using code division multiple access base station, the base station for receiving a plurality of data signals in a time slot, each data signal experiencing a similar channel response, the base station comprising:

• means for receiving a combined signal over the shared spectrum in the time slot, the combined signal comprising the plurality of data signals;
• means for sampling the combined signal at a multiple of a chip rate of the combined signal;
• means for estimating the similar channel response;
• means for determining a spread data vector based on in part a fast fourier transform (FFT) decomposition of a circulant version of the channel response matrix;
• and
• means for despreading the spread data vector to recover data from the channel response matrix.

A time division duplex using code division multiple access base station, the base station receiving a plurality of data signals in a time slot, each data signal experiencing a similar channel response, the base station comprising:

• means for receiving a combined signal over the shared spectrum in the time slot, the combined signal comprising the plurality of data signals;
• means for estimating the similar channel response;
• means for constructing a channel correlation matrix based on in part the estimated channel response;
• means for determining a spread data vector based on in part a fast fourier transform (FFT) decomposition of a circulant version of the channel correlation matrix;
• and
• means for despreading the spread data vector to recover data from the received combined signal.