Code division multiple access wireless system with closed loop mode using ninety degree phase rotation and beamformer verification
View Patent ↗A wireless communication system ( 10 ). The system comprises a user station ( 12 ). The user station comprises despreading circuitry ( 22 ) for receiving and despreading a plurality of slots received from at least a first transmit antenna (A 12 1 ) and a second transmit antenna (A 12 2 ) at a transmitting station ( 14 ). Each of the plurality of slots comprises a first channel (DPCH) comprising a first set of pilot symbols and a second channel (PCCPCH) comprising a second set of pilot symbols. The user station further comprises circuitry ( 50 ) for measuring a first channel measurement (α 1,n ) for each given slot in the plurality of slots from the first transmit antenna and in response to the first set of pilot symbols in the given slot The user station further comprises circuitry ( 50 ) for measuring a second channel measurement (α 2,n ) for each given slot in the plurality of slots from the second transmit antenna and in response to the first set of pilot symbols in the given slot. The user station further comprises circuitry ( 52 ) for measuring a phase difference value (φ 2 (n)) for each given slot in the plurality of slots in response to the first channel measurement and the second channel measurement for the given slot and in response to a ninety degree rotation of the given slot relative to a slot which was received by the despreading circuitry immediately preceding the given slot.
1. A method of transmitting information comprising the steps of:
receiving an information signal;
receiving a plurality of coefficients from a remote communication system;
averaging less than four of the coefficients over a plurality of slots;
producing a plurality of weighted information signals from respective coefficients and the information signal; and
transmitting the plurality of weighted information signals from respective antennas.
2. A method as in claim 1 , comprising the steps of:
encoding the information signal;
interleaving the information signal;
symbol mapping the information signal; and
modulating the information signal.
3. A method as in claim 1 , wherein the step of producing a plurality of weighted information signals comprises the steps of:
multiplying the information signal by a first coefficient, thereby producing a first weighted information signal; and
multiplying the information signal by a second coefficient, thereby producing a second weighted information signal.
4. A method as in claim 3 comprising the steps of:
transmitting the first weighted information signal from a first antenna; and
transmitting the second weighted information signal from a second antenna.
5. A method as in claim 3 , wherein the respective coefficients correspond respectively to previously transmitted weighted information signals.
6. A method as in claim 3 comprising the steps of:
transmitting a first set of pilot symbols over a primary common control physical channel (PCCPCH); and
transmitting a second set of pilot symbols and the weighted information signals over a dedicated physical channel (DPCH).
7. The method as in claim 1 , wherein less than four is two.
8. An apparatus, comprising:
circuitry for receiving an information signal;
circuitry for receiving a plurality of coefficients from a remote communication system;
circuitry for averaging less than four of the coefficients over a plurality of slots;
producing a plurality of weighted information signals from respective coefficients and the information signal; and
transmitting the plurality of weighted information signals from respective antennas.
9. The apparatus of claim 8 , further comprising:
circuitry encoding the information signal;
circuitry for interleaving the information signal;
circuitry for symbol mapping the information signal; and
circuitry for modulating the information signal.
10. The apparatus of claim 8 , further comprising:
circuitry for multiplying the information signal by a first coefficient, thereby producing a first weighted information signal; and
circuitry for multiplying the information signal by a second coefficient, thereby producing a second weighted information signal.
11. The apparatus of claim 10 , further comprising:
circuitry for transmitting first weighted information signal from a first antenna; and
circuitry for transmitting second weighted information signal from a second antenna.
12. The apparatus of claim 10 , wherein the respective coefficients correspond respectively to previously transmitted weighted information signals.
13. The apparatus of claim 10 , further comprising:
circuitry for transmitting a first set of pilot symbols over a primary common control physical channel (PCCPCH); and
circuitry for transmitting a second set of pilot symbols and the weighted information signals over a dedicated physical channel (DPCH).
14. The apparatus of claim 8 , wherein less than four is two.