Abstract
This paper proposes high-quality signal transmission techniques for personal communication systems. A novel coherent demodulatior - VCHACE, Variable Carrier filter and HAng-up free clock recovery Coherent dEmodulator - has been proposed. The proposed carrier recovery circuit uses a reverse-modulation scheme with variable band-width carrier filter. By employing the proposed scheme, the FER (Frame Error Rate) performance is improved by 2dB compared with the differential detection scheme in typical Rayleigh fading environments. An ADPCM voice transmission scheme that employs a click noise suppressor has been also proposed. It achieves a voice quality improvement of 0.5 points in MOS evaluation (3dB improvement in required Eb/No) compared with conventional muting schemes in fading environments.
| Original language | English |
|---|---|
| Pages (from-to) | 733-737 |
| Number of pages | 5 |
| Journal | IEEE Vehicular Technology Conference |
| Volume | 2 |
| Publication status | Published - 1995 Jan 1 |
| Externally published | Yes |
| Event | Proceedings of the 1995 IEEE 45th Vehicular Technology Conference. Part 2 (of 2) - Chicago, IL, USA Duration: 1995 Jul 25 → 1995 Jul 28 |
ASJC Scopus subject areas
- Computer Science Applications
- Electrical and Electronic Engineering
- Applied Mathematics