Resources Contact Us Home
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
Enzymatic demethylation of flavonoids
Security authentication method, apparatus, and system
System or method to assist and automate an information security classification and marking process for government and non-government organizations for information of an electronic document
Hydrofluorocarbon refrigerant compositions for heat pump water heaters
Luminescent nanosheets, and fluorescent illuminators, solar cells and color displays utilizing the same as well as nanosheet paints
Memory component and memory device
  Randomly Featured Patents
Respiration monitoring method and apparatus including cardio-vascular artifact detection
Method for treating coccidiosis
Composition for manufacturing logs for handling pallets or building elements such as panels, rubble stone or the like
System for distributed workflow in which a routing node selects next node to be performed within a workflow procedure
Merchandise sales data processing apparatus
Organic anti-reflective coating material and its preparation
Disposable diaper having a humidity transfer region, Breathable zone panel and separation layer
Apparatus for coating a surface with a metal utilizing a plasma source
Blister package
Car jacks