數位電視廣播之符號邊界偵測和佈散領航碼同步設計

Abstract

在地面數位電視廣播和手持式數位電視廣播系統中，盲目的傳輸的符號模式、保護區間長度和符號邊界偵測佔了很重要的角色。同時快速佈散領航碼同步也必須被用來增進系統同步的時間。這篇論文提出了一個使用單一硬體、無除法的地面/手持式數位電視廣播盲目傳輸符號模式、保護區間長度和符號邊界偵測合併架構。藉著使用龍捲風式記憶體存取法，本架構節省了33%的記憶體面積和41.6%的偵測時間。同時也提出一個兩階的快速佈散領航碼同步方法以增加快速佈散領航碼同步演算法的可靠性。藉著預先存入通道估測所需之佈散領航碼，整體的快速佈散領航碼同步時間可以被縮減97.06%到100%。最後，一個三階的解映射和無除法通道補償器合併架構也被展現在此論文。

In DVB-T/H broadcasting system, blind mode, Guard Interval (GI) length detection and coarse symbol synchronization plays important roles to estimate the symbol parameters before TPS is decoded. Also fast scattered pilot synchronization is necessary to reduce the timing of synchronization. In this thesis, a single hardware and division-free architecture modified from Normalized-Maximum-Correlation (NMC) architecture for DVB-T/H mode/GI length detection and coarse symbol synchronization is proposed. By adopting the twister memory access method and a sequential mode detection scheme, the architecture reduces 33% memory cost and at most 41.6% detection latency. A two-stage fast scattered pilot synchronization scheme is also proposed to increase the reliability of scattered pilot synchronization. A channel estimation pilots pre-filling skill is added to the two-stage fast scattered pilot synchronization scheme. Thus the scattered pilot synchronization timing is reduced by at best 100% to 97.06%. Furthermore, a three-stage demapping embedded with division-free frequency domain equalizer (FEQ) scheme is also presented.