在超可靠低延遲通訊場景下基於Alamouti編碼之多輸入多輸出循環脈衝形正交分頻多工

MIMO Circularly Pulse-Shaped OFDM Using Alamouti Coding for URLLC Scenarios

邱浩則(Hao-Tze Chiu)

指導教授 ： 蘇柏青

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2019年)

https://doi.org/10.6342/NTU201902738

摘要

本論文提出了一個基於Alamouti編碼且專為多輸入多輸出循環脈衝形正交分頻多工（CPS-OFDM）設計的新傳輸架構。在第五代行動通訊（5G）中超可靠低延遲通訊（ultra-reliable low-latency communications）場景下，考慮高速移動環境下高偵測信度（high detection reliability ）以及低延遲（low latency）的要求對未來應用而言是至關重要的。為了適用於高都卜勒頻移的環境下，提出的傳輸架構在一個區塊傳輸間，或更精確地說，在一個區塊傳輸間的特徵矩陣域（characteristic-matrix domain）對資料編碼，希望能改善系統的偵測信度。此外，基於所提出的傳輸架構，通道資訊只需要儲存在一個區塊傳輸時間內，因此可以提供相對於空時分組碼（space-time coding）以及時間反轉-空時分組碼（time-reversal STC）較低延遲的特性。模擬結果也顯示在高速移動環境下，提出的傳輸架構在位元錯誤率（bit error rate）的表現會勝過時間反轉-空時分組碼。

關鍵字

第五代行動通訊系統 ； 多輸入多輸出 ； 循環脈衝形正交分頻多工 ； 超可靠低延遲通訊 ； Alamouti 編碼 ； 特徵矩陣域 ； 最大比例合併 ； 分集增益

並列摘要

A new transmit scheme based on Alamouti coding specifically for multiple-input multiple-output circularly pulse-shaped OFDM (MIMO CPS-OFDM) is proposed in this thesis.For the future application under ultra-reliable low-latency communications (URLLC) scenario in 5G, high-mobility environment is essential to be considered along with the requirements of high detection reliability and low latency. In order to adopt to environment of high Doppler frequency shift, proposed scheme encodes the data within one block transmission, or exactly, in characteristic-matrix domain during a block transmission, which is expected to improve detection reliability of the system.Besides, based on proposed scheme, channel state information only needs storing in one block transmission time, so it also provides us property of low latency compared to space-time coding (STC) and time-reversal STC (TR-STC). Simulation results show that for high-mobility environment, the bit error rate (BER) performance base on proposed scheme outperforms TR-STC.

並列關鍵字

5G ； MIMO ； CPS-OFDM ； URLLC ； Alamouti coding ； characteristic-matrix domain ； maximum ratio combining ； diversity gain

參考文獻

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