Interference cancellation in a spread spectrum communication system

摘要

A code division multiple access communication system transmits a pilot and traffic signal over a shared spectrum. The pilot and traffic signal have an associated code and are received over the shared spectrum. The received signals are sampled and the samples are delayed to produce a window. A weighted value for each despread pilot code window sample is determined using an adaptive algorithm. Each window sample is despread with a traffic code. Each despread traffic code window sample is weighted according to a weight corresponding to its respective pilot code sample.

主权项

1. A base station comprising:
a plurality of antennas; circuitry configured to produce a plurality of pilot signals; wherein a different pilot signal of the plurality of pilot signals is transmitted on each of the plurality of antennas; wherein each of the pilot signals is derived from at least a portion of a first pseudo noise (PN) sequence and the at least a portion of the first PN sequence bits for each of the pilot signals is different; wherein the circuitry is further configured to produce data and split the data into a plurality of data streams; wherein the data of each of the data streams has data bits combined with at least a portion of a second PN sequence and the at least a portion of the second PN sequence bits for each stream is different; wherein the circuitry is further configured to weight the data streams in response to weight information received from a user equipment; and a transmitter configured to transmit the plurality of weighted data streams using the plurality of antennas with different pilot signals.