METHOD AND SYSTEM FOR CODE REUSE AND CAPACITY ENHANCEMENT USING NULL STEERING
First Claim
1. Apparatus for wireless communication with at least two mobile units using a null beam steering technique, comprising:
- first and second data sources each having data intended for a different one of said mobile units;
first and second units for respectively spreading data from said first and second data sources, each employing a spreading code for;
spreading their associated input data, said spreading code being one of a same spreading code and a correlated spreading code;
first and second groups of weighting values respectively associated with said first and second data sources, each group of weighting values being respectively supplied to inputs of first and second groups of circuits, each of said first and second groups of circuits respectively receiving an output of said first and second units, for multiplying each received output responsive to an associated weighting value input;
an antenna array comprising a given number of antennas which greater than a number of data sources; and
a third group of circuits each combining an output of one of said circuits in said first group with an associated one of said circuits of said second group and delivering an output of each circuit of said third group to an associated one of said antennas in said array, said antennas being arranged to limit the mobile units to receipt of data from only one of said data sources.
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Abstract
The number of users and data capacity of wireless systems are increased by employing apparatus and method for increasing the number of spreading codes available in the system by providing a mechanism to reuse the already allocated spreading code or use the codes that may correlate to those already being used within the same sector/cell. This, in return, provides capacity improvement proportional to the number of added base station (BS) antennas for each cell. An antenna null steering technique for code allocation maintains the cross correlation properties of the codes only for the desired user and to obtain a gain in capacity improvement.
13 Citations
20 Claims
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1. Apparatus for wireless communication with at least two mobile units using a null beam steering technique, comprising:
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first and second data sources each having data intended for a different one of said mobile units; first and second units for respectively spreading data from said first and second data sources, each employing a spreading code for; spreading their associated input data, said spreading code being one of a same spreading code and a correlated spreading code; first and second groups of weighting values respectively associated with said first and second data sources, each group of weighting values being respectively supplied to inputs of first and second groups of circuits, each of said first and second groups of circuits respectively receiving an output of said first and second units, for multiplying each received output responsive to an associated weighting value input; an antenna array comprising a given number of antennas which greater than a number of data sources; and a third group of circuits each combining an output of one of said circuits in said first group with an associated one of said circuits of said second group and delivering an output of each circuit of said third group to an associated one of said antennas in said array, said antennas being arranged to limit the mobile units to receipt of data from only one of said data sources. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification