應用時空碼於時域非均等錯誤保護之研究

Time-Domain Approaches of Space-Time Coding for Unequal Error Protection

陳昭衛(Chao-Wei Chen)

指導教授 ： 王忠炫

中原大學/工學院/電子工程研究所/碩士(2004年)

https://doi.org/10.6840/cycu200400774

摘要

近年來，通道編碼結合非均等保護引起廣泛的討論與研究，我們針對不同的錯誤保護需求的資料提供適當的保護能力，在實際的應用當中對通道頻寬做最有效率的使用，例如 : 語音、影像、廣播及多媒體通訊系統等。在過去，非均等錯誤保護應用通常著重在單一傳送天線及單一接收天線的架構中，但是這種架構一旦用在通道編碼中，為了使資料傳輸率以及錯誤更正能力維持在一定的水準之上，不可避免的會降低頻寬使用效率且降低資料傳輸量。

在本文中，時空編碼系統結合位元擷取及路徑刪除技術，應用於非均等錯誤保護中，除了能提供高資料傳輸量在多重傳送天線及多重接收線架構外並且能有效的對抗多重路徑衰褪的干擾。我們提出兩種新的等級之碼率匹配擷取及路徑匹配籬柵刪除時空碼，它提供彈性的資料傳輸率並且強而有力的非均等錯誤保護能力，所有相同系列的子碼都可用同一個母碼的解碼器來進行解碼。
同時，我們也提出一分析系統效能的方法來設計好的非均等保護碼。根據此方法藉由電腦搜尋，我們提出一系列各種碼率及不同記憶暫存器之優良非均等錯誤保護碼。

關鍵字

時空編碼技術 ； 路徑刪除技術 ； 非均等錯誤保護 ； 位元擷取技術

並列摘要

Channel coding for unequal error protection (UEP) which can provide different protecting efforts with respect to different protection requirements has recently attracted significant research interests, since it can make the best use of channel bandwidth in many practical application such as broadcast and multimedia communication systems. In the past, the studies of UEP were focused on single-input and single-output schemes which demand inevitably the undesired bandwidth expansion. In this thesis, space-time codes which not only inherit the high data rate transmission of multiple-input and multiple-output systems but also provide the excellent performance against multipath fading are combined with puncturing and path-pruning for the application of UEP. We propose two new classes of UEP schemes, the rate-compatible
punctured space-time codes and the path-compatible pruned space-time codes, with powerful UEP capabilities and flexible decoding structures. The performance analysis is provided together with a design criterion for optimizing the UEP capabilities. Based on the criterion, families of good UEP space-time codes with various rates and memories are given by a computer search.

並列關鍵字

path-pruning ； Space-time coding ； puncturing ； unequal error protection.

參考文獻

J. B. Cain, G. C. Clark, and J. M. Geist, ``Punctured convolutional codes of rate (n-1)/n and simplified maximum likelihood

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