A SINR maximizing 2D RAKE receiver for multi-sensor WCDMA mobile terminals

The 2D RAKE receiver is a spatio-temporal matched filter (MF), matched to the operations of spreading, pulse-shape filtering and spatio-temporal channel filtering. An SINR maximizing linear receiver may perform much better. In the downlink, in which the channel is the same for all intracell signals, and with orthogonal codes and cell-dependent scrambling, good SINR performance can be attained with a RAKE-like receiver. In particular, we replace the pulse-shape MF with another FIR filter, and the sparse propagation channel MF by another sparse filter. The FIR filter can be spatio-temporal or just temporal. In the latter case, it can be identical or different for the different antennas. The sparse filter is spatio-temporal. We compare different choices for the design of the FIR filter and the sparse filter.