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
Ice data collection system
Controller for flexible and extensible flow processing in software-defined networks
Methods of diagnosing a plasmodium infection
System and apparatus for control of published content
Defect inspection method and device therefor
Simultaneous wafer bonding and interconnect joining
  Randomly Featured Patents
Vertical alignment film and VA mode liquid crystal cell
Novel dyes, their production and their use
Silicon oxime film
Methods and systems for manipulation of images of floor coverings or other fabrics
Asynchronous input/output for integrated circuits that latches external asynchronous signal in feedback path of state machine
Apparatus for a basketball net for displaying advertisement, making sounds and creating eye catching visual effects
Apparatus for measuring high density lipoproteins and method of separating high density lipoproteins
Gate-driving apparatus and display device including the same
Message-type data communication apparatus used in a DECT system
Low color and low haze formulations of sodium o-phenylphenate