Methods and apparatus for increasing the uplink gain of a CDMA base station

摘要

An improved CDMA base station (60) for insuring a constant supply of energy to each of a plurality of rake fingers (110-116), thus improving gain, includes a plurality of pairs of diversity antennas (62,64; 66,68). The energy from the first antenna (64, 68) of each pair is subjected to a delay while the energy from the second antenna (62, 66) of each pair is not subjected to a delay. The added delay (86, 88) is greater than the chip time of the rake fingers. The signals from each pair of antennas is combined (90, 92) and converted to digital form (104, 106). The energy from all the antennas is then routed to the rake fingers (110-116), with the energy from each antenna being routed to one of the rake fingers. The energy from the rake fingers is then combined (118) into a single data stream. In an alternative approach, the base station includes a plurality of diversity antennas. The energy from each of the diversity antennas is subjected to a different amount of delay. The delay difference must again be greater than the chip time of the rake fingers. The energy from the antennas is combined, converted to digital format, and routed to each of a plurality of rake fingers, with the energy from each antenna being routed to the rake finger. The energy from the rake fingers is then combined into a single output data stream.