Methods and apparatus for increasing the uplink gain for a CDMA base station
First Claim
1. An uplink antenna system for an uplink station of a CDMA base station, said system comprising:
- two or more antennas for receiving signals from transmitting mobiles;
a plurality of delay units, each of said delay units connected to one of said two or more antennas, each of said delay units being operative to delay transmission of energy received from said one antenna to which it is connected;
a plurality of rake fingers, each of said rake fingers corresponding to one and only one of said antennas, each of said rake fingers operable to receive a signal representative of energy received by said corresponding antenna; and
an input selector, said input selector receiving a plurality of signals, each of said signals being received by said input selector from one of said antennas or from a delay unit connected to one of said antennas, each signal being representative of energy received by a corresponding antenna, said input selector being operative to selectively route said signals from each one of said antennas or from a delay unit connected to one of said antennas to a corresponding one of said rake fingers.
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Accused Products
Abstract
An improved CDMA base station for insuring a constant supply of energy to each of a plurality of rake fingers, thus improving gain. One aspect of the base station includes a plurality of pairs of diversity antennas. The energy from the first antenna of each pair is subjected to a delay while the energy from the second antenna of each pair is not subjected to a delay. The added delay is greater than the chip time of the rake fingers. The signals from each pair of antennas is combined and converted to digital form. The energy from all the antennas is then routed to the rake fingers, with the energy from each antenna being routed to one of the rake fingers. The energy from the rake fingers is then combined 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.
47 Citations
14 Claims
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1. An uplink antenna system for an uplink station of a CDMA base station, said system comprising:
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two or more antennas for receiving signals from transmitting mobiles;
a plurality of delay units, each of said delay units connected to one of said two or more antennas, each of said delay units being operative to delay transmission of energy received from said one antenna to which it is connected;
a plurality of rake fingers, each of said rake fingers corresponding to one and only one of said antennas, each of said rake fingers operable to receive a signal representative of energy received by said corresponding antenna; and
an input selector, said input selector receiving a plurality of signals, each of said signals being received by said input selector from one of said antennas or from a delay unit connected to one of said antennas, each signal being representative of energy received by a corresponding antenna, said input selector being operative to selectively route said signals from each one of said antennas or from a delay unit connected to one of said antennas to a corresponding one of said rake fingers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for increasing the gain of a CDMA uplink antenna system, comprising the steps of:
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receiving energy from transmitting mobiles utilizing two or more uplink antennas, delaying energy from at least one of said antennas;
constructing a plurality of signals, each signal being based on said delayed energy from at least one of said antennas; and
selectively routing a signal from each of said antennas to a corresponding one of a plurality of rake fingers, each rake finger corresponding to one and only one of said antennas, each of said antennas corresponding to one and only one of said rake fingers. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification