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
In-vehicle audio device and in-vehicle audio system
Reinforced thermoplastic molding compositions based on polyarylene ethers
Flash memory device and method of programming same
Delayed-release formulation for reducing the frequency of urination and method of use thereof
Distributed audio system
Glass material for mold pressing, method for manufacturing same, and method for manufacturing optical glass element
Test automation method for software programs
  Randomly Featured Patents
Tool and method for the precision boring of holes
Radiation curable acrylate-terminated polymers having polycarbonate repeating units
Method for producing package for housing photosemiconductor element
Phenoxarsine compounds incorporated into resins with phenols
Real-time mining and reduction of streamed data
Stimulation of a stimulation site within the neck or head
Magnetic recording and reproducing apparatus with tape tension control
Excess-growth control system for fluidized-bed reactor
Near-field light generating element having two different angles
Method for the prevention and treatment of diseases caused by an inflammatory response mediated by endogenous substance P by using anti-substance P antibodies