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
System and method for organizing, processing and presenting information
Radio communication system, transmission apparatus, reception apparatus, and radio communication method in radio communication
Lead frame array package with flip chip die attach
Ascertaining presentation format based on device primary control determination
Unified feedback frame for supporting a plurality of feedback modes and a multiple-input multiple-output (MIMO) communication system using the unified feedback frame
Radio link monitoring (RLM) and reference signal received power (RSRP) measurement for heterogeneous networks
Non-intrusive processor tracing
  Randomly Featured Patents
Ribbon bonding in an electronic package
Power tool mounting stand
Asynchronous time division switching arrangement and a method of operating same
System and method for conference call consolidation
Cooler for granular products
Coin storing tubes
Text localization for image and video OCR
Circuit for biasing a transistor and related system and method
Molded-in connector
Semiconductor memory device