Method for limiting the dynamic range of a CDMA signal
US6278702A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1998 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Dec 2, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/70706
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The invention is a method and system for reducing the dynamic range of a signal input to a power amplifier in a CDMA forward-link transmission system. This is achieved by introducing a controllable amount of code-domain distortion to the data prior to spreading by Walsh codes. The amount of distortion is calculated by creating a data vector, applying a transform to the data vector to obtain a sequence, distorting the result to obtain a distorted sequence, applying an inverse transform to the distorted sequence to obtain a distorted data vector and comparing the distorted data vector to the original data, thereby to obtain the amount of code-domain distortion to be added to the data. The resultant, "corrected" spread-spectrum waveform can be controlled to the extent that it is guaranteed never to exceed a prescribed voltage range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.