Resources Contact Us Home
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
Base station device and wireless communication method
Proximity sensor arrangement in a mobile device
Charged particle source with multiple selectable particle emitters
Shape memory polymers formed by self-crosslinking of copolymers
Image scanning apparatus and image forming apparatus
Method of creating exercise routes for a user and related personal navigation device
Wire guide
  Randomly Featured Patents
Display device having unit light emission region with discharge cells and corresponding driving method
Weight number for a golf club head
Method and apparatus for providing an operating mode alias to a radio
Image displaying method, device, and computer-readable storage medium
Grounding clamp
Molded articles for holding wafers
Simple music performance system, music data supplier and computer program installed in the music data supplier
Fuel injection pump for internal combustion engines
Active wafer cooling during damage engineering implant to enhance buried oxide formation in SIMOX wafers
Method of Forming a Drug-Eluting Medical Device