具有同步跟蹤功能的單用戶TH-SS PPM超寬帶系統(tǒng)性能分析
Performance Analysis of a Single User TH-SS PPM UWB System with Synchronization Timing Tracking Ability
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摘要: 目前超寬帶系統(tǒng)均假設(shè)已知發(fā)射機與接收機之間準確的傳播時延,收發(fā)雙方完全同步,而任何系統(tǒng)收發(fā)雙方必然存在同步誤差.該文針對這一點,提出了一種具有同步跟蹤功能的單用戶TH-SS PPM超寬帶系統(tǒng),設(shè)計了同步跟蹤方法,推導出了系統(tǒng)中存在同步誤差時,解調(diào)器輸出端信噪比計算公式和系統(tǒng)BER表達式.理論分析與仿真結(jié)果表明,系統(tǒng)BER與同步誤差大小有很大關(guān)系,同步誤差越小,系統(tǒng)BER越小.
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關(guān)鍵詞:
- 超寬帶; 同步; 跟蹤; TH-SSPPM
Abstract: It is usually assumed that the perfect propagation delay has been achieved between the receiver and the transmitter, the receiver and the transmitter synchronize per-fectly, actually it is impossible to do this. Because of this, this paper proposes a single user TH-SS PPM UWB system with synchronization timing tracking ability, designs the synchronization timing tracking scheme, derives the receiver demodulator output SNR while the synchronization timing error exists between the transmitter and the receiver. The syn-chronization timing error has great effects on the system BER performance. Theoretical analysis and simulation results indicate that the less the synchronization timing error, the less the system BER. -
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