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
Pointer display device, pointer display/detection method, pointer display/detection program and information apparatus
System and method for removing oxide from a sensor clip assembly
Resistor-2 resistor (R-2R) digital-to-analog converter with resistor network reversal
Door-activated entry light fixture
Lithographic apparatus and device manufacturing method
Superconducting magnetizer
Method and apparatus for information exchange over a web based environment
  Randomly Featured Patents
Portable speaker
Space-time diversity for wireless systems
Operating apparatus for automatic transmission
Wind turbine blade with cambering flaps
Torque wrench
System for grouping and displaying cardiac arrhythmia data
Method and apparatus for moving a handling system
Ostomy bags and vessels for biological materials
Method for synchronizing and archiving information between computer systems
Adjustable apparatus for delivering drinks on demand