Patent ID: 6868112

Claim:
An apparatus for detecting signals of space-time coding based on transmission diversity, comprising: a plurality of correlators for subjecting received signals to de-spread with the same spreading code as a spreading code used in the transmission side to obtain transmission symbols decoded; a plurality of channel estimators for obtaining channel estimates of slots according to the transmission symbols of pilot symbol intervals from said correlators to determine an average channel estimate of each symbol through linear interpolation and filtering of the channel estimates; a plurality of space-time decoders for decoding the transmission symbols of two data symbol intervals received from said correlators based on the channel estimates of said channel estimator to detect the data symbols; a plurality of output control devices for comparing an average signal strength and interference of each slot of the received signals with a threshold value to control output of the data symbol detected by said space-time decoders; and a combiner for linearly combining the detected signals of said space-time decoders multiplied by the control signals of said output control devices, wherein each of said channel estimator of the plurality of channel estimators includes: a slot channel estimator for filtering a pilot symbol to estimate a channel gain, and obtaining a weighted average of the channel estimates of several slots in order to produce a channel estimate of the slot; a linear interpolation circuit for subjecting the channel estimate from the slot channel estimator to linear interpolation to produce a channel estimate of each transmission symbol; and a linear filtering circuit for obtaining an average of the channel estimates of the symbols extracted by the linear interpolation circuit for a given interval in order to produce an average channel estimate of the transmission symbol.