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
Microfluidic system incorporating a metal impregnated nanoporous material in a microfluidic pathway thereof
VGPU: a real time GPU emulator
Apparatus for counting particles in a gas
Systems and methods for universal enhanced log-in, identity document verification and dedicated survey participation
Inspection tool for top guides of a boiling water reactor
Traveling vehicle system and self-diagnosis method for the traveling vehicle system
Sealing member for piezoelectric resonator device, and piezoelectric resonator device
  Randomly Featured Patents
Deriving signal constraints to accelerate sequential test generation
Method for detecting impermissible operating states in a hot-air clothes dryer, and a dryer with such a detection method
Implantable infusion pump
High-performance LRU memory capable of supporting multiple ports
Site-specific doppler navigation system for back-up and verification of GPS
System and method for handling load and/or store operations in a superscalar microprocessor
Joystick apparatus
Insulating boot for electrical device mounted in connector box
Switched capacitor amplifier circuit having bus precharge capability and method