Patent ID: 6373832
Filing Date: 2002-04-16
Classification: H04B

Abstract:
A code division multiple access communication system, comprising:first and second code division multiple access transceivers employing multipath diversity, the first code division multiple access transceiver having a plurality of antennas disposed to provide transmission via a plurality of paths, the second code division multiple access transceiver having a rake arrangement for processing a plurality of versions of a signal received at the rake arrangement with differing delays or differing other characteristics; means for operating said first code division multiple access transceiver to use a subset of the plurality of antennas in the absence of an indication that an adequate plurality of resolvable multipath versions of the signal are not received at the rake arrangement of the second code division multiple access transceiver; and means for switching said first code division multiple access transceiver to use more of the plurality of antennas when an indication is obtained that an adequate plurality of resolvable multipath versions of the signal are not received at the rake arrangement of the second code division multiple access transceiver, said switching means comprising means for providing a feedback signal from the second code division multiple access transceiver to the first code division multiple access transceiver to provide the indication that the adequate plurality of resolvable multipath versions of the signal are not received at the rake arrangement of the second code division multiple access transceiver.