Patent ID: 7161972

Claim:
A ZF (Zero Forcing) joint detection apparatus used for a downlink receiver, comprising: a channel estimator for estimating a channel impulse response of a multipath fading channel of a received signal; a channel equalizer including means for estimating a transmission signal ŝ j− by performing channel compensation and removing multipath interference by a deconvolution technique based on the estimated channel impulse response h of the received signal r j , represented by the following equation: s ^ j = r j h 1 , for ⁢ ⁢ j = 1 ; s ^ j = 1 h 1 ⁢ { r j - ∑ i = 2 J ⁢ ⁢ h i ⁢ s ^ J - i + 1 } , for ⁢ ⁢ j = 2 , 3 , … ⁢ , W ; and s ^ j = 1 h 1 ⁢ { r j - ∑ i = 2 W ⁢ ⁢ h i ⁢ s ^ j - i + 1 } , for ⁢ ⁢ j = W + 1 , W + 2 , … ⁢ , NQ , wherein N, Q, and W are positive integers respectively representing, a length of a data sequence, a length of a spreading sequence, and a length of a channel impulse response; and a user detector for receiving the transmission signal from the channel equalizer and for detecting a symbol-level data sequence transmitted by a specific user.