PI/4-DQPSK phase state encoder/decoder
US5438592A · kind A · utility
10Cited by
3References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1994 |
| Grant date | Aug 1, 1995 |
| Priority date | — |
| Expiry date | Mar 31, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/18
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A .pi./4-DQPSK differential phase state encoder/decoder (Codec) is presented which can be implemented using a small number of logic gates. The phase state Codec acts upon data in the transmitter and in the receiver of a .pi./4-DQPSK modulating system whereby the use of a look-up table technique or other off-line procedure to ensure proper phase transitions is not required. The phase state Codec is configured to ensure compliance with the IS-54 standard as well as other similar standards.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.