抄録
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.
| 本文言語 | English |
|---|---|
| ページ | 1258-1262 |
| ページ数 | 5 |
| 出版ステータス | Published - 1996 |
| 外部発表 | はい |
| イベント | Proceedings of the 1996 IEEE Communications Theory Mini-Conference. Part 4 (of 4) - London, UK 継続期間: 1996 11月 18 → 1996 11月 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
- 電子工学および電気工学
- 地球変動および惑星変動