Resources Contact Us Home
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
Web-based system and method for video analysis
Soybean cultivar BY0811143
Plant disease control composition and its use
Methods of prognosing a rheumatoid arthritis remission phenotype
Detachably integrated battery charger for mobile cell phones and like devices
Illumination apparatus for microlithography projection system including polarization-modulating optical element
Integrated circuit packaging system with an integral-interposer-structure and method of manufacture thereof
  Randomly Featured Patents
Thread clamp for a weaving machine
Stereo optical module and stereo camera
Stackable belleville spring
Multiple beam optical memory system with solid-state lasers
Method for conducting diagnostic assays
Hydrophobically modified polyols for improved hydrophobic soil cleaning
Cap surface
Electronic hybrid having synthesized impedance circuitry
Mini-dystrophin nucleic acid sequences