Patent ID: 6879578
Filing Date: 2005-04-12
Classification: H04B

Abstract:
1. A time division duplex using code division multiple access user equipment, the user equipment for receiving a plurality of data signals in a time slot, each data signal experiencing a similar channel response, the user equipment 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 at a multiple of a chip rate of the combined signal; and a data detector device for constructing a channel response 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 response matrix, and despreading the spread data vector to recover data from the received combined signal.