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
System and method for interactive image-based modeling of curved surfaces using single-view and multi-view feature curves
Delay interferometer using magneto-optic effect of a variable faraday rotator
Implant for performance enhancement of selected transistors in an integrated circuit
System and method for identifying a target signal in an optical transport network frame structure
Optical angular position detection apparatus and method
Semiconductor device
Semiconductor device
  Randomly Featured Patents
Water level sensing unit, steam generator having the same, and heating cooking apparatus having the steam generator
Method of separating streams of displacing multi-layered stacks of rodlike elements and valve device for separating streams of multi-layered stacks of rodlike elements
Space launch vehicles configured as gliders and towed to launch altitude by conventional aircraft
System and method for positioning a pile cap underneath an existing elevated bridge assembly
Combined organizer and tray for an endodontic dental kit
Method and a device for generating printing data in a color space defined for non-standard printing inks
Pipette tip
Umbrella rib linkage system
Device for holding helically wound wire resistor of a wire-wound type potentiometer
Developing apparatus using magnetic particles and toner particles