Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Methods and systems for enabling community-tested security features for legacy applications
LED drive circuit
System and methods for facilitating and documenting user thinking and learning using enhanced interactive constructs
Wireless refrigerant scale platform
Method for transmitting an electronic short message to multiple receivers
Pre-sealing unit for wire-cut electric discharge machine
Organic EL display device and method for manufacturing the same
  Randomly Featured Patents
Eyeglass and other personal items holder
Coin stack lighter
Bleaching of substrates
System for control of brake actuator based at least in part upon tire/road friction force
Magnet device with double fixing positions for changing the magnetic circuit
Virtual connection route selection apparatus and techniques
Information recording scheme for preventing recording failure resulting from impact of vibration
Methods and apparatus for automatically launching sticks of various materials into oil and gas wells
I/O interface control method and data processing equipment which completes I/O operation in execution when abnormal state occurs
Method and system for providing backside voltage contrast for silicon on insulator devices