Abstract
This paper proposes a bit-stream-arranged weighted modulation scheme to improve voice quality in frequency selective fading channels. The proposed modulation scheme employs an input bit stream arrangement method which changes the bit stream order for important bits so that they do not adjoin each other over time and a mapping method which controls the amplitude of modulation signals according to the importance of the bits. Computer simulations clarify that the proposed bit-stream-arranged weighted modulation scheme shows a noise reduction of 7 dB in voice signal compared with the conventional π/4-shift DQPSK modulation scheme.
| Original language | English |
|---|---|
| Pages | 1258-1262 |
| Number of pages | 5 |
| Publication status | Published - 1996 Dec 1 |
| Externally published | Yes |
| Event | Proceedings of the 1996 IEEE Communications Theory Mini-Conference. Part 4 (of 4) - London, UK Duration: 1996 Nov 18 → 1996 Nov 22 |
Other
| Other | Proceedings of the 1996 IEEE Communications Theory Mini-Conference. Part 4 (of 4) |
|---|---|
| City | London, UK |
| Period | 96/11/18 → 96/11/22 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Global and Planetary Change