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
Charged-particle beam lens
Identifying media content in queries
System and method for the analysis of biodiesel
Methods and systems for optimizing data accesses
Gas flow indicator
Power control arrangement for long term evolution time division duplex method and apparatus
Antenna support device
  Randomly Featured Patents
Footwear upper
Light-sensitive compound, light-sensitive mixture, and light-sensitive copying material prepared therefrom with 0-naphthoquinone diazide compound
Production control information processing device
System and method for digital telephones on H.323 networks
Detector for surface texture measuring instrument
Vitreoretinal instrument
Remote controller holder
Semiconductor device and method for manufacturing the same
Floor saver toilet flange
Vibration detector