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
Optical channel transport unit frames transmission having interleaved parity
Access control method, information display device using the same, and information display system
Evaluation compiler method
Client-managed group communication sessions within a wireless communications system
Managing distributed applications using structural diagrams
Image reading apparatus and image forming apparatus
Establishing a graphical user interface (`GUI`) theme
  Randomly Featured Patents
Product dispenser
Radio with cassette player
Deactivation of thionyl chloride cells
Confectionery mold with attached handle
Laser processing method and semiconductor chip
Weapon station and associated method
System and method for operating a conduit to transport fluid through the conduit
Separable bridge
Performance light rare earth, iron, and boron magnetic alloys