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
Digital broadcasting system and method of processing data in digital broadcasting system
Virtual billboards
Method for accessing wireless network
Device for data routing in networks
Processing color and panchromatic pixels
Distylium plant named `PIIDIST-I`
Point-of-sale cart
  Randomly Featured Patents
System of operating an automatic plotter
Treatment of acne, seborrheic dermatitis and other skin diseases with salt solution containing NACL
Apparatus and method for purifying boron trichloride by removal of phosgene
Unilateral upright row
Composite grip for golf clubs
Rupture resistant plasma tube
Optical light weight glass
Fabrication of low frequency structureborne vibration isolation mount
Dead ended bulbed rib geometry for a gas turbine engine
Process for the removal of sulfate ions from an electrolyte