Multiuser detection with partial information for asynchronous CDMA-based radio networks

We propose and evaluate a form of multiuser detector for base-station reception in CDMA wireless. The setting we hate in mind is one in which the interference atomy base station has components whose parameters - power delay, signature sequence - are known to the receiver as well as components, representing out-of-cell transmissions, for example, whose parameters are unknown The signals to be jointly decoded are thus to be extracted from a larger aggregate, plus noise, on the basis of partial parameter information. The setup provides a framework in which to study the impact of parameter information and detection group size on receiver performance. The proposed receiver architecture, amenable to adaptive as well as non-adaptive implementation, features a bank of linear equalizers at the input and a maximum-likelihood detector at the output; performance is described in terms of mean-square error bit error rate and asymptotic efficiency. Computational complexity per bit, given the size of the detection group, is independent of the number of interferers.