07016649 is referenced by 60 patents and cites 18 patents.

The present invention utilizes adaptive antenna arrays at a base station to increase the forward link capacity of mobile data systems. One or more simultaneous forward link beams are formed and are switched (or hopped) in a time division manner among subscribers. The beam hopping sequence is randomized by varying the time slot and/or carrier frequency of each subscriber. In space-time hopping, the position within a frame of the time slot for each subscriber is varied in a pseudo random sequence. In space-frequency hopping, the carrier frequency for each frame is varied in a pseudo random sequence. The pseudo random beam hopping sequence provides a gain due to interference diversity in addition to the antenna array gain. Forward link beam forming algorithms use space-time or space-frequency hopping to increase the capacity of mobile data systems.

Title
Space-time and space-frequency hopping for capacity enhancement of mobile data systems
Application Number
9/803718
Publication Number
7016649 (B1)
Application Date
March 9, 2001
Publication Date
March 21, 2006
Inventor
Jiangfeng Wu
Combell
CA, US
Shimon B Scherzer
Sunnyvale
CA, US
Piu Bill Wong
Monte Sereno
CA, US
Ravi Narasimhan
Los Altos
CA, US
Agent
Fulbright & Jaworski
Assignee
Kathrein Werke KG
DE
IPC
H04Q 7/20
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