Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Multicode direct sequence spread spectrum










Image Number 14 for United States Patent #RE37802.

In this patent, we present MultiCode Direct Sequence Spread Spectrum (MC-DSSS) which is a modulation scheme that assigns up to N DSSS codes to an individual user where N is the number of chips per DSSS code. When viewed as DSSS, MC-DSSS requires up to N correlators (or equivalently up to N Matched Filters) at the receiver with a complexity of the order of N.sup.2 operations. In addition, a non ideal communication channel can cause InterCode Interference (ICI), i.e., interference between the N DSSS codes. In this patent, we introduce new DSSS codes, which we refer to as the "MC" codes. Such codes allow the information in a MC-DSSS signal to be decoded in a sequence of low complexity parallel operations which reduce the ICI. In addition to low complexity decoding and reduced ICI. MC-DSSS using the MC codes has the following advantages: (1) it does not require the stringent synchronization DSSS requires, (2) it does not require the stringent carrier recovery DSSS requires and (3) it is spectrally efficient.








 
 
  Recently Added Patents
Editing device and editing method
Non-visual presentation of information on an electronic wireless device
Sterilizable film for aseptic packaging
Method and apparatus for increasing query traffic to a web site
Apparatus and method for storing event information for an HVAC system
Systems and methods for authorizing, authenticating and accounting users having transparent computer access to a network using a gateway device
Apparatus with a local timing circuit that generates a multi-phase timing signal for a digital signal processing circuit
  Randomly Featured Patents
Aluminum hydroxide gel particle and production method thereof
Folding tray table for chairs
Calibrating an optical transceiver via adaptive testing
Wireless communication system and method of controlling same
Notepaper dispenser
Trans-excision-splicing ribozyme and methods of use
Longitudinal rail profilometer
Rotary valve for balloon catheter
Method and apparatus for timing modeling
Apparatus for altering the body temperature of a patient