Patent ID: 6320899
Filing Date: 2001-11-20
Classification: H04B

Abstract:
A two-dimensional demodulator for a Code Division Multiple Access system with antenna array, comprising:a multipath detector which receives sampled digital baseband signals and outputs time information concerning where multipath signals and phase information of transmitting codes are located, and outputs correlation values after comparing a correlation value of a snapshot signal and an estimated code sequence with a threshold value established in advance when the correlation value is larger than the threshold value;multiple beamformers which receive the correlation values output from said multipath detector and sampled digital baseband signals, and create multiple scalar signals in linear combination, using space information associated with an incoming direction of said sampled digital baseband signals;multiple multipath trackers which execute code tracking for phase conformity with transmitting codes and create multiple scalar signals and frequency error components for each path after passing through a time alignment process for each path, using the phase information of transmitting codes output from said multipath detector, and scalar signals from said multiple beamformers; anda multipath combiner which combines multiple scalar signals and frequency error components created from said multiple multipath trackers for the time domain respectively.