Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Multicode direct sequence spread spectrum










Image Number 16 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
LED driving circuit, LED illumination appliance, LED illuminator, and LED illumination system
Superagonistic anti-CD28 antibodies
Cucumber plants with a compact growing habit
Supplier capability methods, systems, and apparatuses for extended commerce
Sub-LUN input/output profiling for SSD devices
Position pointer, variable capacitor and inputting apparatus
Method and apparatus for compensating QoS during handover by base station in wireless broadband access system
  Randomly Featured Patents
Solid-state hydrogen storage media and catalytic hydrogen recharging thereof
Image processing apparatus and image processing method
Fishing reel
Antenna unit having improved antenna radiation characteristics
Web camera
Agent for promoting the proliferation of bifidobacterium
Wing leading edge slat
Motorcycle fuel tank
CardBus PC card type wireless transmitting/receiving device
Toothbrush