Abstract
An OQPSK (offset quadrature phase shift keying) burst demodulator using a reverse modulation scheme for low E//b/N//0 operation is described. A carrier-recovery circuit using a reverse modulation scheme for OQPSK signals is analyzed, and its performance is clarified. A novel binary transmit-receive code for OQPSK burst signals is proposed to reduce the recovered carrier phase error. To additionally reduce the recovered carrier phase error, a digitally controlled tracking filter is proposed, and an automatic frequency control LSI has been developed for the tracking filter. Experimental results show that a prototype 130-Mb/s OQPSK burst demodulator using a reverse modulation scheme works stably with low carrier cycle slipping rate even in a low E//b/N//0 environment.
| Original language | English |
|---|---|
| Pages (from-to) | 889-895 |
| Number of pages | 7 |
| Journal | Conference Record - International Conference on Communications |
| Publication status | Published - 1987 Dec 1 |
ASJC Scopus subject areas
- Computer Networks and Communications
- Electrical and Electronic Engineering