Communication station having an improved antenna system
First Claim
1. A base station comprising:
- (a) an antenna system including a plurality of antennas, wherein the antenna system generates a combined signal based on signals received by the plurality of antennas;
(b) a radio frequency (RF) receiver which generates a baseband signal based on the combined signal; and
(c) at least one modem configured to process the baseband signal, the modem comprising;
(i) an analog to digital converter for converting the baseband signal into a digital signal;
(ii) a tracker which directs the analog to digital converter to sample the strongest analog representation of data being transmitted to the base station to provide an accurate digital signal which includes a digital data signal and a digital pilot signal;
(iii) a phase lock loop; and
(iv) a vector correlator which determines, in conjunction with the phase lock loop, filter coefficients based on a distortion of the pilot signal, wherein the filter coefficients are associated with both natural multipath distortion and artificially introduced distortions imparted by the antenna system.
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Abstract
A communication station includes an antenna system having multiple antennas and delay units for receiving a transmitted signal and outputting a combined signal having a known distortion imparted by the antenna system. The combined signal is in turn processed by a modem, which compensates for the known distortion in a manner which provides improved signal gain. The improved signal gain permits a reduction in transmit power and, accordingly, increased capacity of the communication station. Where the antenna system is to be remotely located from related signal processing equipment, separate units for the RF receiver/transmitter and the other signal processing equipment are provided so that the RF receiver/transmitter may also be remotely located along with the antenna system.
21 Citations
18 Claims
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1. A base station comprising:
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(a) an antenna system including a plurality of antennas, wherein the antenna system generates a combined signal based on signals received by the plurality of antennas;
(b) a radio frequency (RF) receiver which generates a baseband signal based on the combined signal; and
(c) at least one modem configured to process the baseband signal, the modem comprising;
(i) an analog to digital converter for converting the baseband signal into a digital signal;
(ii) a tracker which directs the analog to digital converter to sample the strongest analog representation of data being transmitted to the base station to provide an accurate digital signal which includes a digital data signal and a digital pilot signal;
(iii) a phase lock loop; and
(iv) a vector correlator which determines, in conjunction with the phase lock loop, filter coefficients based on a distortion of the pilot signal, wherein the filter coefficients are associated with both natural multipath distortion and artificially introduced distortions imparted by the antenna system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A subscriber unit comprising:
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(a) an antenna system including a plurality of antennas, wherein the antenna system generates a combined signal based on signals received by the plurality of antennas;
(b) a radio frequency (RF) receiver which generates a baseband signal based on the combined signal; and
(c) at least one modem configured to process the baseband signal, the modem comprising;
(i) an analog to digital converter for converting the baseband signal into a digital signal;
(ii) a tracker which directs the analog to digital converter to sample the strongest analog representation of data being transmitted to the subscriber station to provide an accurate digital signal which includes a digital data signal and a digital pilot signal;
(iii) a phase lock loop; and
(iv) a vector correlator which determines, in conjunction with the phase lock loop, filter coefficients based on a distortion of the pilot signal, wherein the filter coefficients are associated with both natural multipath distortion and artificially introduced distortions imparted by the antenna system. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification