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
Controlling transmission resources in mobile radio systems with dualtransfer mode
Display control device, display control method, and touchpad input system
Products for animal use including humans having a certificate verifying at least one of efficacy or safety, and methods of providing such certificates
Antennas and their coupling characteristics for wireless power transfer via magnetic coupling
AIN buffer N-polar GaN HEMT profile
Power or voltage oscillation damping in a power transmission system
Method and system for network configuration for virtual machines
  Randomly Featured Patents
Method and apparatus for strong signal suppression in multi-carrier signals
Liquid crystal display backlight inverter
Veronica plant named `YABPIN`
Wire winding apparatus and method
Compositions and methods using Morinda citrifolia
Scraping tool
Method to verify a drop probability curve
Surround processor
Satellite spin vector control with sun sensor
Heat exchanger made of aluminum alloy