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 for transmitting a signal
Integrated testing circuitry for high-frequency receiver integrated circuits
Device for maneuvering a vehicle using maneuvering moves using at least one trajectory
Methods of establishing virtual circuits and of providing a virtual private network service through a shared network, and provider edge device for such network
Light powered hearing aid
Liquid crystal shutter glasses
Liposomes with improved drug retention for treatment of cancer
  Randomly Featured Patents
Sequentially pulsed energy flow loop
Telecommunications circuit provisioning and administration system
Toy knitting machine
Releasable and interchangeable connections for golf club heads and shafts
Composite sign post
Integrated hybrid electrochemical device
Inflatable evacuation slide
System providing multiple focused radiation beams
Automatic dispenser of visiting cards
Method of interchangeably using two disc cartridges with two different types of shutters