Abstract
A decomposed model of CPM (continuous phase modulation) modulator which consists of a linear CPE (continuous phase encoder) and a memoryless modulator was proposed. Based on the error event analysis and recursive feature of CPM signal, a Turbo CDMA (code division multiple access) system with CPM spreading modulation was presented, in which CPM modulator as a recursive inner coder can be used to concatenate with other outer coders and interleaver into a Turbo iterative system to improve the performance of CDMA system. With the use of iterative demodulation, despreading and decoding an iterative soft-input-soft-output receiver was suggested, in which MAP and SOVA algorithms are implemented in the demodulator, and MAP algorithm is realized in the decoder. Simulations have shown that CPM spreading modulator as an inner coding modulator can provide the interleaver gain explicitly.
| Translated title of the contribution | A Turbo CDMA system with CPM spreading modulation |
|---|---|
| Original language | Chinese (Simplified) |
| Pages (from-to) | 1466-1469 |
| Journal | 电子学报 |
| Volume | 30 |
| Issue number | 10 |
| Publication status | Published - Oct 2002 |
Research Keywords
- CPM 扩频调制
- Turbo 检测
- MAP 解扩与解码
- SOVA 算法
- CPM spreading modulation
- Turbo detection
- MAP detection and decoding
- SOVA algorithm