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










Image Number 19 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
Group of amino substituted benzoyl derivatives and their preparation and their use
Reusing data in user run book automation
Promoting content
Automated user interface adjustment
Wristwatch
Pre and post-paid real time billing convergence system
Method and system for providing status of a machine
  Randomly Featured Patents
Scalable high pressure compressor variable vane actuation arm
Plasma display panel
Analog buffer circuit capable of compensating threshold voltage variation of transistor
Method for preparation of conjugated arylene and hetroarylene vinylene polymers
Molded case for returnable beverage bottles
Connecting structure of connectors
Mayonnaise base and method for producing it
Liquid-reservoir hairbrush
Use of polypeptides against diseases caused by protozoans
Flash unit and camera