Combined angular, spatial, and temporal diversity for mobile radio system

A method of providing diversity reception of signals at a base station used in a CDMA mobile radio communication system that comprises a cellular or PCS communication system, wherein said base station includes a receiver, said method comprising the steps of:

• positioning a first narrow beamwidth antenna element so as to receive CDMA signals transmitted from mobile transceivers located in a predetermined geographic coverage area;
• positioning a second narrow beamwidth antenna element so as to receive CDMA signals transmitted from mobile receivers located in the same predetermined geographic coverage area as said first antenna assembly, said second antenna element being separated in distance from said first antenna element by a plurality of wavelengths;
• orienting said pair of antenna elements so that respective peak boresights form a 45 to 60° angle with respect to each other while being slanted 22.5 to 30° with respect to a boresight of the coverage area, wherein said first and second antenna elements are positioned to each cover a half of a 120° sector and the boresights of the antenna elements are oriented to provide a sector crossover point between elements which is 3 Db down from a peak beam gain;
• combining all outputs of said first and second antenna assemblies;
• and
• connecting the combined output to the CDMA base station receiver for demodulation.

In a CDMA mobile radio communication system that comprises a cellular or PCS communication system, a base station for communicating with a plurality of mobile transceivers comprising:

• a first diversity antenna assembly comprising a pair of narrow beamwidth antenna elements arranged to receive CDMA signals transmitted from mobile transceivers located in a predetermined geographic coverage area, wherein said pair of antenna elements are oriented so that respective peak boresights form a 45 to 60° angle with respect to each other while being slanted 22.5 to 30° with respect to a boresight of the coverage area;
• a second diversity antenna assembly comprising a pair of narrow beamwidth antenna elements arranged to receive CDMA signals transmitted from mobile receivers located in the same predetermined geographic coverage area as said first antenna assembly, wherein said pair of antenna elements are oriented so that respective peak boresights form a 45 to 60° angle with respect to each other while being slanted 22.5 to 30° with respect to a boresight of the coverage area, and wherein said second antenna assembly is separated in distance from said first antenna assembly by a plurality of wavelengths;
• a signal combiner for combining the outputs of said first and second antenna assemblies;
• a receiver connected to said signal combiner for receiving the best qualitative signal;
• said pair of narrow beamwidth antenna elements of both said first and second antenna assemblies each are arranged to cover half of a 120° sector within a cell site controlled by said base station;
• and
• the boresights of the respective antenna element pairs of said first and second antenna assemblies provide a sector crossover point between element pairs which is 3-5 Db down from a peak beam gain.