The integrated services digital broadcasting-terrestrial (ISDB-T) system adopts band segmented transmission orthogonal frequency division multiplexing (BST-OFDM) to support different services using hierarchical transmission. In the ISDB-T system, in particular, a hierarchical configuration depends on modulation type used in OFDM segment, which has to be decoded at the receiver. Therefore, it is necessary to detect integer carrier frequency offset (IFO) before decoding the modulation type carried through transmission and multiplexing configuration control (TMCC) signal. To address this issue, an effective IFO estimation scheme is presented for the ISDB-T system, considering information-carrying TMCC signal as pilot symbol without any need of additional pilots. In order to verify the performance of the proposed estimation scheme, theoretical detection error rate is derived. It is shown from simulation results that the redundantly transmitted TMCC signal can be efficiently utilized for IFO detection, offering an approximate performance of maximum likelihood detection.

中文翻译：

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数字地面电视广播系统整数载频偏移的次优最大似然检测

地面综合业务数字广播（ISDB-T）系统采用频带分段传输正交频分复用（BST-OFDM）来支持使用分层传输的不同业务。特别是在 ISDB-T 系统中，分层配置取决于 OFDM 段中使用的调制类型，必须在接收器处对其进行解码。因此，有必要在解码传输和复用配置控制（TMCC）信号携带的调制类型之前检测整数载波频率偏移（IFO）。为了解决这个问题，ISDB-T系统提出了一种有效的IFO估计方案，将携带信息的TMCC信号作为导频符号，不需要额外的导频。为了验证所提出的估计方案的性能，推导出理论检测错误率。仿真结果表明，冗余传输的TMCC信号可以有效地用于IFO检测，提供近似最大似然检测的性能。