Improved linear decorrelating detector on chip level in multiple antenna CDMA system

Linear decorrelating detection, one of the MUD (multi-user detection) methods, has been proposed in CDMA system to combat MAI (multiple access interference) and improve performance, because of its low calculation complexity and relative good performance. However, one drawback of this method is that the inverse of the cross-correlation matrix between different users does not always exist. In this paper, it is effectively solved by replacing the matrix with an extended one which combines cross-correlation and channel coefficients matrix together on chip level. The BER performance simulation in multi-antenna multiuser CDMA system employing this new method over ITU-VA fading channel shows that it performs almost as good as the optimum detection method does while it has a much lower computation complexity.