Fractional interpolative timing advance and retard control in a transceiver
US8306174B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2009 |
| Grant date | Nov 6, 2012 |
| Priority date | — |
| Expiry date | Aug 6, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W56/0045
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Transmission of information between user equipment (UE) and base stations in a wireless network occurs using a stream of periodic data. A modem in the UE operates synchronized to a first clock source to produce the stream of periodic data at a chip rate. Transceiver circuitry is synchronized to a variable clock source to receive the stream of data from the first circuitry at a rate according to the variable clock source. A fixed phase relationship is maintained between the variable clock source and the first clock source while the data period is uniform by adjusting the variable clock in response to detected phase errors. Occasionally, one period of the periodic data is changed by a defined amount. The fixed phase relationship is restored over a number of periods in a gradual manner by changing the frequency of the variable clock by an amount. By restoring the phase relationship gradually, quality degradation of the transmitted signal is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.