PRACTICAL SPACE-TIME RADIO METHOD AND DEVICE FOR CDMA COMMUNICATION CAPACITY ENHANCEMENT

摘要

PPROBLEM TO BE SOLVED: To provide a method and a device for enhancing signal quality (carrier-to-interference, C/I) in both uplink and downlink of wireless point-to-multi point CDMA service. PSOLUTION: This approach is facilitated by using very small bit count arithmetic and capitalizing on finite alphabet signal structure (Walsh symbols, for example in IS-95 CDMA) or a known training sequence. Alternately, floating point data representations are used. The method utilizes the uplink channel data to determine the downlink spatial structure (array beams) to enhance downlink C/I and hence increase the downlink capacity. The use of the known signal structure facilitates simple array response vector determination and eliminates the necessity for covariance matrix calculation and analysis. PCOPYRIGHT: (C)2010,JPO&INPIT