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
Image forming apparatus forming images in response to image formation request from operation unit or external device
Methods and apparatus for monitoring communication through identification of priority-ranked keywords
Summarization of short comments
Electronic device with a screen
System and method for detecting an earth ground fault of an external power supply connected to a vehicle
System and method for locating, tracking, and/or monitoring the status of personnel and/or assets both indoors and outdoors
Method and device for reducing image color noise
  Randomly Featured Patents
Soluble hyaluronidase glycoprotein (sHASEGP), process for preparing the same, uses and pharmaceutical compositions comprising thereof
Hinged label holder for wire shelving
Strike template for a portable router
Cleat system
Grinder and core drill with dust collection
Oil-gas-water multi-phase flow adjusting apparatus and oil-gas-water multi-phase flow rate measuring apparatus and measuring method
Fluid flow control apparatus
Dipeptidyl peptidase IV inhibitors for the treatment of schizophrenia and depression
Information processing method and apparatus
Saddle-type vehicle drivetrain