Median weighted tracking for spread-spectrum communications
US6983009B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 18, 2001 |
| Grant date | Jan 3, 2006 |
| Priority date | — |
| Expiry date | May 13, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D10/00
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An improvement for a method and system for tracking a spreading code, used in a code division multiple access (CDMA) system. An input signal has spread-spectrum modulation. The spreading code embedded in the spread-spectrum modulation has a plurality of chips. The input signal is sampled, and half-chip offset samples are formed from the sampled input signal. An even set of the half-chip offset samples are grouped into an early set of samples, and an odd set of the half-chip offset samples are grouped into a late set of samples. Each early set of samples is multiplied by the spreading code c(n+1), c(n+2), . . . , c(n+L), to generate a first plurality of products. L is approximately equal to the number of chips of delay between the earliest and latest multipath signals. A first plurality of sums and magnitudes are computed from the first plurality of products. The first plurality of magnitudes are summed to generate an early signal-energy value. Each late set of samples is multiplied by the spreading-code c(n−1), c(n−2), . . . , c(n−L), thereby generating a second plurality of products. A second plurality of sums and magnitudes are computed from the second plurality of products. The …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.