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
Battery system
Magnetic recording head having a dual sidewall angle
Two wheeled vehicle with all wheel drive system
Light fixture
System and method for physical layer device enabled clock diagnostics
Compounds from Antrodia cinnamomea and use thereof
Predictive analytic modeling platform
  Randomly Featured Patents
Radiation curable acrylated polyurethane oligomer compositions
Metal, passivating layer, semiconductor, field-effect transistor
Active semi-weathervaning anchoring system
Method of filling and pressurizing a container
Electrochemical cell having gas pressurized contact between laminar, gas diffusion electrode and current collector
Synchronous generator
Key controlled alarm activating system
Electromagnetic load drive apparatus
Method for producing quaternary ammonium compounds
Fluorinated bisaryloxy-substituted alkenes, process for their preparation and their use