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
Tailoring the band gap of solar cells made of liquid silane by adding germanium
Grounding fitting
Specification of latency in programmable device configuration
Method and apparatus for verifiable generation of public keys
Fabrication method of packaging substrate having through-holed interposer embedded therein
Generating compiled code that indicates register liveness
Compositions of quaternary ammonium compounds containing bioavailability enhancers
  Randomly Featured Patents
Rotor system, particularly a boat propeller system
Dynamic interactive survey system and method
Sliding contact roller head
Sedum plant named `Noneb`
Container for floppy disks and the like
Method for vehicle route planning
Component interconnect with self-clocking data
Printhead orientation
Overhead electric and optical transmission systems
Cross-triggering of processing devices