Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Resonant oscillator with start up and shut down circuitry
Cosmetic product including vegetable oil blend
Controller with screen
Damage resistant antenna
Submersible remote smoke sensor
Wireless communication system and wireless communication method
Network traffic demotion
  Randomly Featured Patents
Golf shoe upper
Surface acoustic wave filter device
Ballast tamping machine
Thiarubrine antifungal agents
Tape printing device
Apparatus for adding grinding media to a grinding mill
Wireless gas composition sensor system
Production device for connecting rod
Level detection circuit
Bottle