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標題: 結合訊源編碼與通道編碼在正交分頻多工系統連結時空區塊碼傳輸在多路徑衰減通道下之效能分析
Performance Analysis of MIMO-OFDM Systems Concatenated with JSCC over Multi-Path Fading Channel
作者: 程一軒
Cheng, Yi-Syuan
關鍵字: 結合訊源編碼與通道編碼;JSCC;階層數區段分割壓縮碼;多輸入多輸出系統;正交分頻多工系統;SPIHT;MIMO;OFDM
出版社: 電機工程學系所
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SPIHT的高壓縮率且具有漸進式傳輸的影像編碼架構,其編碼效率高、速度快且複雜度低,但是當位元訊息產生錯誤時,回覆的影像往往不得辨識,因此針對不等同重要性資料,使用不等同錯誤保護(Unequal Error Protection,UEP)的渦輪碼與低密度查核碼,將通道編碼的效率提升以節省多餘的查核位元,同時低頻係數的重要資料能有更好的錯誤保護。本篇論文模擬在802.11與COST207兩種標準下之多路徑衰減通道,針對此頻率選擇性衰減通道的效應,引用OFDM的技術將調變信號分成多個正交子載波在一個時間週期平行傳送。再引用多根天線傳輸相同的信號,經過數個獨立的通道由多根天線接收,以降低信號同時錯誤的機會,並且提升分集的增益(diversity gain)。並針對整體系統在不同多路徑環境觀察接收端還原影像之影像信號雜訊比(Peak signal-to-noise ratio)之優劣。

SPIHT has a high compression rate that could provide a progressive transmission over image-coded structure, it is also a high code-rate, fast encoded and low complexity code. But when the bit stream error occurs, the recovered image is unrecognized. Therefore, we have to use different Unequal Error Protected (UEP) Turbo code and LDPC code to raise the channel coding rate according to their different importance level in order to reduce to unnecessary parity check bits and meanwhile the important low frequency data factors can have a better protection. In this thesis, we simulate the transmission over IEEE 802.11 and COST207 two different standard multi-path fading channels. According to these fading channels, we will use OFDM technique to transform signals into multiple orthogonal subcarriers to be transmitted over multiple antenna transmission structure in the same time period. By applied Multiple Input Multiple Output (MIMO) technique in to the multi- antenna system, we could reduce the error probability of transmitting error in the same time, also raise the diversity gain of total transmission and observe the system peak signal-to-noise ratio performance of the recovering image at the receiver.
其他識別: U0005-3007200915071300
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