Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Multichannel wideband digital receiver making use of multiple wideband tuners having individually selectable gains to extend overall system dynamic range










Image Number 4 for United States Patent #5590156.

A technique for extending the instantaneous dynamic range available in a wideband digital basestation for use in a wireless communication network. The basestation processes the bandwidth allocated to it in two or more sub-bands. The sub-bands are each processed by a digital tuner section consisting of an amplifier, analog-to-digital (A/D) converter, and digital filter bank. The digital filter bank may make use of multirate digital signal recovery techniques for efficient implementation. In operation, a received signal strength indication (RSSI) is first determined for each subscriber unit requesting access to the basestation. A channel assignment controller then assigns a transmit frequency to the subscriber unit depending upon this RSSI. In particular, subscriber units exhibiting a relatively stronger RSSI are to transmit on a frequency assigned to a first digital tuner section, while subscriber units having a relatively weak RSSI are assigned to a second digital tuner section. The gains of the first and second tuner sections of each other adjusted independently, to insure that the relatively strong signals are not clipped by the first tuner section, and that the relatively weak signals may be correctly detected by the second tuner section. The net effect is to provide a much greater overall system dynamic range. The invention can be used to advantage in both existing AMPS type cellular systems as well as CDMA systems.








 
 
  Recently Added Patents
Flashlight
Power conversion device for electric vehicle
Escalating data backup protection in response to a failure in a cluster of nodes
Method for producing purified influenza virus antigen
Delay interferometer using magneto-optic effect of a variable faraday rotator
Image heating device
System and method for detecting states
  Randomly Featured Patents
Diazabicyclic CNS active agents
Charged particle accelerator
Low profile active shock module prosthesis
Restraint and protection seat for infant
Cassette holder
Developing member
Robe hook
Electrooptic measurement systems for frequency analysis of very wide range signals
Skidproof plate for an excavator
Compositions comprising a fluoroolefin