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 3 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
Apparatus and method for extracting cascading style sheet rules
Method and apparatus for focusing electrical stimulation in the brain during electro-convulsive therapy
Method of monitoring and configuring
Composite materials comprising aggregate and an elastomeric composition
Toner for developing electrostatic charge image, electrostatic charge image developer, toner cartridge, process cartridge, image forming method, and image forming apparatus
Method to prevent hyper frame number de-synchronization in a wireless communication system
Insulated container sleeve
  Randomly Featured Patents
Fluorine-containing aromatic compounds
Food tray
Thiazole derivatives which are angiotensin II receptor antagonists, their methods of preparation and pharmaceutical compositions in which they are present
Treatment of solid containing material derived from effluent
Dense medium separation
Thermonuclear fusion system
Apparatus for locking a magazine
Actuated feeder for birds and small animals
Tool handle