08873585 is referenced by 60 patents and cites 851 patents.

The invention is directed to a method and system for supporting MIMO technologies which can require the transport of multiple spatial streams on a traditional Distributed Antenna System (DAS). According to the invention, at one end of the DAS, each spatial stream is shifted in frequency to a pre-assigned band (such as a band at a frequency lower than the native frequency) that does not overlap the band assigned to other spatial streams (or the band of any other services being carried by the DAS). Each of the spatial streams can be combined and transmitted as a combined signal over a common coaxial cable. At the other “end” of the DAS, the different streams are shifted back to their original (overlapping) frequencies but retain their individual “identities” by being radiated through physically separate antenna elements.

Title
Distributed antenna system for MIMO technologies
Application Number
11/958062
Publication Number
8873585 (B2)
Application Date
December 17, 2007
Publication Date
October 28, 2014
Inventor
Rami Reuven
Rishon Letzion
IL
Isaac Shapira
Petach Tikav
IL
Ofer Saban
Meshek
IL
Igor Berlin
Potomac
MD, US
Yair Oren
Washington
DC, US
Agent
C Keith Montgomery
Assignee
Corning Optical Communications Wireless
IL
IPC
H04B 7/04
H04B 7/06
H04B 7/02
H04W 4/00
H04J 1/00
View Original Source