Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method and system for equalizing cable losses in a distributed antenna system










Image Number 12 for United States Patent #8121646.

The invention is directed to a method and system for equalizing the signal losses over cable runs in a Distributed Antenna System (DAS). In a DAS, two or more antennae are connected to the system by cable runs that can vary widely in length. As a result, the signal loss over a given cable run can also vary widely which can impact the design and deployment of the DAS and reduce antenna spacing. In addition, for a broadband DAS that supports many frequency bands or ranges using a common antenna unit, the signal losses vary with respect to frequency further making it difficult to equalize the cable losses. According to one embodiment of the invention, the method and system provide for measuring and adjusting the signal losses of each cable run to be a predefined value. According to another embodiment of the invention, the DAS can include a hybrid passive-active antenna unit which includes a frequency multiplexer that separates the signal into frequency bands or ranges that are connected to an antenna element associated with a particular frequency band or range. Where a single frequency band needs to be amplified (or attenuated), a single band amplification block (SBAB) can be inserted in the connection between the frequency multiplexer and the antenna element to amplify (or attenuate) the desired frequency band. Where more than one frequency band need to be amplified (or attenuated), a multiband amplification block (MBAB) can be inserted in the connection between the frequency multiplexer and the appropriate antenna element to amplify (or attenuate) the desired frequency bands.








 
 
  Recently Added Patents
Drugs for prophylaxis or mitigation of taxane-induced neurotoxicity
Image forming apparatus and job request control method instructed by authenticated users
Managing breakpoints in a multi-threaded environment
Cardiac function management integrating cardiac contractility modulation
Method and apparatus for connecting to external device
Electrical connector
Login security with short messaging
  Randomly Featured Patents
Active termination network
Method and apparatus for turning eggs
Fuzzy content network management and access
Exercise and amusement device for pets
Track and trolley with dual drive wheels having annular track engaging surfaces of different diameters
Method for producing polyether-polyol having narrow molecular weight distribution
Low profile fluid quick connector
Sheet of polyphenylene sulfide filaments and process for producing the same
Pet tags
Apparatus and method for checking network synchronization clock signal in communication system