Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Integrated advance copper fuse combined with ESD/over-voltage/reverse polarity protection
Apparatus and method for phase synchronization in radio frequency transmitters
Soybean EF1A promoter and its use in constitutive expression of transgenic genes in plants
Storage basket with lid
Sacrificial spacer approach for differential source/drain implantation spacers in transistors comprising a high-k metal gate electrode structure
Process for producing polyphenylene ether composition
Flash memory apparatus and method for generating read voltage thereof
  Randomly Featured Patents
Automated calibration and standardization apparatus
Application of a coating on a medical device
Contents distributing server, contents distribution control method, program, and recording medium
Liquid crystal materials and alignment structures and optical devices containing same
Golf club
Loudspeaker suspension
Apparatus for spreading a particle mass
Digital camera
Small form factor cooling system
Omnidirectional audio in a communications device