Coherent orthogonal filter using pilot symbol-assistedchannel estimation for DS-CDMA
Hidehiro Andoh, Yoshinori Miki, Mamoru Sawahashi · Electronics Letters · 1996
A coherent orthogonal filter (COF) using pilot symbol-assisted channel estimation is proposed for DS-CDMA cellular mobile radio. In the proposed scheme, a complex fading envelope in the multi-path environment is estimated using pilot symbols, and tap coefficients of orthogonal filter are controlled for maximising the signal to interference ratio (SIR) of a RAKE combined signal. Computer simulation results show that the required Eb/N0 of the proposed COF is reduced by ~10.0 dB compared to a conventional matched filter receiver at an average BER of 3 × 10-2 when there are 10 users and processing gain is 31.