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
Method and systems for detecting duplicate travel path
Dynamic web page construction based on determination of client device location
Therapeutic vitamin D sun-protecting formulations and methods for their use
Video editing apparatus
Adaptive known signal canceller
Front cover of an electronic device
Lubricating oil with enhanced protection against wear and corrosion
  Randomly Featured Patents
Image forming apparatus with toner cartridge authentication
Optical information medium
Method of metering a fluid using a multi-mode differential fluid displacement pump
Magnetic detecting circuit having magnetoresistance effective elements oriented in at least two different directions
Flavoring with 5-acyl-2-(furfurylthio)dihydro-2,5-dialkyl-3-[2H]furanones
Turbocharger combustor system
Polyisocyanurate compositions and foams of improved friability and process of preparing same
Golf club head
Treatment of conditions and disease
Apparatus for treating a patient