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 5 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 apparatus for filter-less class D audio amplifier EMI reduction
Methods and systems for optimizing data accesses
System and method for wireless messaging in a wireless communication system
Focus detection device and imaging apparatus having the same
Systems and methods for simultaneously configuring multiple independent backups
Vehicle headlight
  Randomly Featured Patents
System and method for multiple virtual computing environments in data storage environment
Video repeat reproduction method and apparatus
Surgical implants
Sol-fusin: use of GP64-6His to catalyze membrane fusion
Semiconductor thyristor device having integral ballast means
Downhole measurement of depth
Combined anti-refilling and pouring device for fitment to a bottle
Verbena plant named `Carpuvi`
Antibody-drug conjugates
Coated particles containing a monomeric, polyfunctional organosilane coating