Device enabling different spreading factors while preserving a common rambling code, in particular for transmission in a code division multiple access cellular mobile radio system
US6868077B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1999 |
| Grant date | Mar 15, 2005 |
| Priority date | — |
| Expiry date | Apr 14, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J13/00
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A device which enables different spreading factors while preserving a comnmon scrambling code, in particular for transmission in a code division multiple access cellular mobile radio system. The device including a grouper for grouping the various data symbols of a kth incoming sequence (k=1, . . . , K) into different blocks of QMAX/QK symbols, and a spreader for spreading K incoming sequences with K respective spreading codes of respective length Qk (k=1, . . . , K) which is a sub-multiple of a maximum length QMAX, wherein the spreader spreads the blocks from the kth incoming sequence (k=1, . . . , K) with the corresponding code of length Qk to obtain a spread sequence including different spread blocks of length QMAX. The device further includes a scrambler for scrambling each of the K spread sequences obtained in this way using a scrambling code of length QMAX.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.