Embedded digital beam forming
First Claim
1. A transmitter system having a plurality of channels associated therewith, said system comprising:
- an antenna having a plurality of transmit signals associated therewith for radiation of at least one output of a plurality of modulation outputs of a transmitter wherein said plurality of transmit signals combine in free space to form a plurality of variable size beams in a radiation pattern;
means for splitting each of said plurality of modulation transmitter outputs into signal components;
means for selectively providing select ones of said modulation transmitter output signal components to one or more of said transmit signals, wherein said selectively providing means includes a plurality of independently operable switching means, wherein each of said plurality of independently operable switching means is assigned to a particular channel of said plurality of channels; and
means for adaptively altering an attribute of ones of said signal components prior to providing to said transmit signals, wherein a size of a beam of said plurality of variable size beams is at least in part defined as a function of a relative difference of said attribute of said signal components as provided to said transmit signals.
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Accused Products
Abstract
Disclosed is a system utilizing a multi-beam antenna that switches the beams to a CDMA demodulation receiver in such a way that the best beams are selected. The transmit path takes the traffic channel outputs from the CDMA modulators and maps each traffic channel to the subset of beams that have the best path to the mobile in the forward link. Accordingly, the system operates to reduce interference on both the forward and reverse links, as well as to increase the capacity of both the forward and reverse links. The system also is capable of providing flexible dynamic shaping of the cell and the sectors by mapping the appropriate overhead channels on the forward link and the reverse link in different combinations of beams to sectors in order to shape the cell. Adaptive arrays may be utilized to form radiation patterns, for which the azimuthal width and/or length of a sector may be adjusted by way of adjustments of the relative amplitude and phase of signal components of signals at antennas of a phased array adaptively controlled according to communication parameters such as information indicating the quality of the communication channel on that sector, interference from other channels or the number of calls serviced in particular sectors.
34 Citations
45 Claims
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1. A transmitter system having a plurality of channels associated therewith, said system comprising:
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an antenna having a plurality of transmit signals associated therewith for radiation of at least one output of a plurality of modulation outputs of a transmitter wherein said plurality of transmit signals combine in free space to form a plurality of variable size beams in a radiation pattern; means for splitting each of said plurality of modulation transmitter outputs into signal components; means for selectively providing select ones of said modulation transmitter output signal components to one or more of said transmit signals, wherein said selectively providing means includes a plurality of independently operable switching means, wherein each of said plurality of independently operable switching means is assigned to a particular channel of said plurality of channels; and means for adaptively altering an attribute of ones of said signal components prior to providing to said transmit signals, wherein a size of a beam of said plurality of variable size beams is at least in part defined as a function of a relative difference of said attribute of said signal components as provided to said transmit signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A CDMA receiver system having a plurality of CDMA channels associated therewith, said system comprising:
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a multibeam antenna for providing a plurality of variable size beams in a radiation pattern having a plurality of beam receive signals associated therewith; a CDMA receiver, wherein said CDMA receiver includes a plurality of demodulation inputs; a switch bank for selectively providing signal components of select ones of said plurality of receive signals to one or more of said plurality of demodulation inputs, wherein said switch bank includes a plurality of independently operable switching circuits, wherein each of said plurality of independently operable switching circuits is assigned to a different channel of said plurality of CDMA channels; and means for adaptively altering an attribute of select ones of said signal components of select ones of said receive signals prior to providing to said demodulation inputs, wherein a relative difference of said attribute of said signal components of ones of said receive signals at least in part defines a beam of said plurality of variable size beams. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method for utilizing a multi-beam antenna with a CDMA base transceiver station having a plurality of CDMA channels associated therewith, for providing a plurality of variable size beams in a radiation pattern, said method comprising the steps of:
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providing a plurality of receive signals for input into a demodulation receiver having a plurality of inputs; providing a plurality of transmit signals for radiation of at least one output signal from a modulation transmitter having a plurality of outputs, wherein said plurality of transmit signals combine in free space to form said plurality of variable size beams; selectively providing signal components of ones of said receive signals to ones of said demodulation receiver inputs, wherein said selectively providing step utilizes a plurality of independently operable input switching circuits each assigned to a different one of said CDMA channels; selectively providing signal components of said at least one output signal to select ones of said transmit signals, wherein said selectively providing step utilizes a plurality of independently operable output switching circuits each assigned to a different one of said CDMA channels; adaptively altering an attribute of select signal components of ones of said receive signals prior to providing to said demodulation receiver inputs, wherein a relative difference of said attribute of said signal components of ones of said receive signals at least in part defines a beam of said plurality of variable size beams; and adaptively altering an attribute of ones of said signal components of said at least one output signal prior to providing to said transmit signals, wherein a relative difference of said attribute of said signal components at least in part defines a beam of said plurality of variable size beams. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification