Resources Contact Us Home
Multicode direct sequence spread spectrum

Image Number 16 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
Display system with mounting assemblies and associated methods
Device chip carriers, modules, and methods of forming thereof
Dimmer system and damper circuit thereof
Cell proliferation inhibitor
Method and system for updating device management application meter read logic
Bioactive agent-loaded heart-targeting nanoparticles
User interfaces
  Randomly Featured Patents
Anchor apparatus
System and method for electronic communication management
Pulsed electrical remote control interface, equipment and satellite comprising such an interface
Case for optical discs
Lighted sweat shirt
Energy conservation system for using heat from air conditioning units to heat water supply lines
Electric power steering apparatus
Valve and spring arrangement for engine
Closed end coaxial connector