Method and apparatus for generating a large number of codes having desirable correlation properties
US6912240B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 2001 |
| Grant date | Jun 28, 2005 |
| Priority date | — |
| Expiry date | Dec 11, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J13/10
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a method for generating and apparatus for employing code families having desirable correlation properties. Regardless of code length, maximum autocorrelation of the codes is 4 for any nonzero offset and maximum cross-correlation of any two codes from a code family is 4 for any offset. The codes can be used in impulse radio systems and non-impulse radio systems including CDMA, TDMA, FDMA, OFDM and various other frequency hopping and direct sequence systems. The codes can be used to specify various impulse radio and non-impulse radio signal characteristics including pulse position in time, amplitude, width, type, phase, phase difference, frequency, spreading code, etc. The codes have the unique property that they can specify as many as two components in which a signal is not present. A method of code compression is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.