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
Statistical information collection from one or more device(s) in storage communication with a computing platform
Creation and use of test cases for automated testing of media-based applications
Receiving security risk feedback from linked contacts due to a user's system actions and behaviors
Activated carbon cryogels and related methods
Thiocyanato or isothiocyanato substituted naphthalene diimide and rylene diimide compounds and their use as n-type semiconductors
Adding value to a rendered document
Method and apparatus for an active low power mode of a portable computing device
  Randomly Featured Patents
Method to optimize net lists using simultaneous placement and logic optimization
Process for the preparation of salts of L-carnitine and alkanoyl L-carnitine with mucic acid
Polyester foamed thin materials
Network terminal apparatus
Method for automatically cropping digital images
Plants and seeds of hybrid corn variety CH394570
Method of making local interconnections for dynamic random access memory (DRAM) circuits with reduced contact resistance and reduced mask set
Wafer cleaning apparatus
Prophylactic device