Abstract
In underwater acoustic digital communications, two main factors which affect the performance of communication systems seriously are multipath fading and Doppler frequency shift. A blind equalizer based on fractionally-spaced decision-feedback structure, which efficiently combats the multipath fading effects of underwater acoustic channels, is discussed. Towards the time-varying Doppler underwater acoustic channels, a modified constant modulus fractionally-spaced decision-feedback equalization and second-order digital phase-locked loop combined algorithm, which can efficiently correct the channel-introduced carrier phase rotation, is proposed. Finally the performance of the proposed algorithm is compared with a constant modulus baud-spaced decision-feedback blind equalization algorithm by computer simulation, and the simulation results confirm the effectiveness of the proposed algorithm.
| Original language | English |
|---|---|
| Pages (from-to) | 559-562 |
| Number of pages | 4 |
| Journal | Xitong Fangzhen Xuebao / Journal of System Simulation |
| Volume | 17 |
| Issue number | 3 |
| State | Published - Mar 2005 |
Keywords
- Blind equalization
- Decision-feedback
- Fractionally-spaced
- Modified constant modulus
- Underwater acoustic communication