CDMA receiver with antenna array adaptively controlled with combined errors of despread multipath components

摘要

In a CDMA receiver, signals from a number of correlatively spaced apart antennas are respectively multiplied by weight coefficients and summed together to produce a weighted sum signal, which is separated into multipath components of a transmitted signal. The multipath components are despread with a chip sequence, producing despread signals at symbol intervals. Demodulators estimate channel responses of propagation paths from the despread signals and multiply the despread signals by the estimated channel responses to produce demodulated signals, which are summed and a threshold decision is made on the sum of the demodulated signals to produce a decision output. Error detection circuitry multiplies the decision output by the estimated channel responses to produce a number of multiplied decision outputs, and detects differences between the multiplied decision outputs and the despread signals to produce a number of error signals, which are combined together. Weight control circuitry is responsive to the combined error signals for updating the weight coefficients.