臺灣博碩士論文加值系統

本論文中我們考慮獨立及相鄰跳頻系統，在多音頻干擾下經過通道後，使用強健式決策度量與可能性決策度量做硬式決策，以及使用maxvalue-self軟式決策度量與可能性決策度量錯誤更正碼搭配位元交錯器或符元交錯器的效能。本論文中，所採取的通道為可加性白色高斯雜訊(Additional White Gaussian Noise,AWGN)和頻率選擇性雷利衰減(frequency selective Rayleigh fading)通道。錯誤更正碼的使用上，選擇使用摺積碼(convolutional codes)跟渦輪碼(turbo codes)。由電腦模擬結果得知，獨立跳頻系統與相鄰跳頻系統，兩者的系統效能差不多，但相較於相鄰跳頻系統，獨立跳頻系統在概似函數的計算公式上是較簡單的。使用maxvalue-self軟式決策度量的摺積碼與渦輪碼，搭配位元交錯器或符元交錯器中，除了符元交錯摺積碼效能相當接近使用可能性決策度量的符元交錯摺積碼外，其餘的效能都很差。使用可能性決策度量的摺積碼與渦輪碼，搭配位元交錯器或符元交錯器中，當訊雜比 較低時，搭配符元交錯器的效能會優於搭配位元交錯器。相較於TC-BI渦輪碼，TC-BI-ID渦輪碼在waterfall region有較好的效能。

In this thesis. We want to investigate the performances of using the robust metric and likelihood metric to make hard decision and using maxvalue-self soft metric and likelihood metric with an error correcting code collocation bit-interleaving or symbol- interleaving on independent-hopping and contiguous-hopping system which added the multitone jamming. We use the channel is AWGN(Additional White Gaussian Noise) and frequency selective Rayleigh fading channel. In the use of error correcting codes, we select using convolutional codes and turbo codes. Simulation results show that performances of independent-hopping system and contiguous-hopping system are almost, but independent-hopping system in the formula for calculating the likelihood function is simpler than contiguous-hopping system. Performances of convolutional codes and turbo codes together with either bit-interleaving or symbol-interleaving of using maxvalue-self soft metric are bad except for convolutional codes with symbol-interleaving. Convolutional codes and turbo codes together with either bit-interleaving or symbol-interleaving of using likelihood metric, For low SNR, symbol-interleaved coding schemes outperform bit-interleaved coding schemes. Compared to the TC-BI turbo codes, TC-BI-ID turbo codes have better performance in the waterfall region.

摘　要........................................................i
ABSTRACT.................................................ii
誌 謝.....................................................iv
目 錄......................................................v
圖目錄....................................................vii
第一章 緒論.................................................1
第二章 多音頻干擾下的快速跳頻/MFSK通訊系統.......................2
2.1傳送端 ..................................................2
2.2通道模型.................................................4
2.3接收端 ..................................................6
2.4決策度量.................................................8
2.4.1強健式決策度量..........................................8
2.4.2可能性決策度量.........................................10
2.4.3模擬結果..............................................12
2.4.4綜合比較..............................................29
第三章 軟式解碼摺積碼在多音頻干擾下的快速跳頻/MFSK效能模擬.........36
3.1摺積碼 .................................................36
3.2模擬結果................................................38
第四章 軟式解碼渦輪碼在多音頻干擾下的快速跳頻/MFSK效能模擬.........46
4.1渦輪碼 .................................................46
4.2模擬結果................................................50
第五章 結論................................................61
參考文獻...................................................63
附錄A.....................................................64
附錄B.....................................................71

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