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
Methods and systems for delivering customized advertisements
Sitagliptin intermediate compounds, preparation methods and uses thereof
Electronic device and recording medium
Malicious attack detection and analysis
Deflection device for a scanner with Lissajous scanning
Flat display panel and method for forming the same
Probe for ultrasound diagnostic apparatus
  Randomly Featured Patents
Remediation treatment of sustained casing pressures (SCP) in wells with top down surface injection of fluids and additives
Vehicle partition compatible with side air bags
One-chip semiconductor integrated circuit device capable of outputting analog color signal or digital color signal
Method of optimizing a guitar tremolo
Power control system for synchronous memory device
Cytofectin dimers and methods of use thereof
Control system for engine-driven auxiliary equipment for vehicles
Method and system for providing resource access in a mobile environment
Multi-perspective business process configuration