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
Interactive program guide systems and processes
Weight-balanced polygonal mirror, light scanning unit using the polygonal mirror, and image forming apparatus
Mitigating single point failure of devices in an analyte monitoring system and methods thereof
System for targeted delivery of therapeutic agents
Provision of downlink packet access services to user equipment in spread spectrum communication network
Method and apparatus for connecting to external device
Defensin polynucleotides and methods of use
  Randomly Featured Patents
Dynamic fixation assemblies with inner core and outer coil-like member
Network availability enhancement technique for packet transport networks
Ratcheting for master alignment of a teleoperated minimally-invasive surgical instrument
Termination unit
Windshield wiper switch
Carpet sweeping device
Method of preparing a coarse-pored formed carbon
Phenylacetic acids
Production of diorganopolysiloxanes having silanol end groups
Method and apparatus for executing load distributed printing