METHOD AND SYSTEM FOR CODE REUSE AND CAPACITY ENHANCEMENT USING NULL STEERING

摘要

The number of users USER A, USER B and data dA, dB capacity of wireless systems Fig. 1 are increased by employing apparatus and method for increasing the number of spreading codes CA, CB 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 1, 2, 3 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.