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    • 4. 发明申请
    • JOINT PREAMBLE AND CODE RATE IDENTIFIER IN A MOBILE DTV SYSTEM
    • 移动数字电视系统中的联合预先和代码率标识符
    • US20120230437A1
    • 2012-09-13
    • US13505330
    • 2009-11-13
    • Ivonete MarkmanRichard W. Citta
    • Ivonete MarkmanRichard W. Citta
    • H04N7/26
    • H04L1/0075H03M13/296H03M13/47H03M13/6306H04L27/02H04L27/2613
    • A joint preamble and code rate identifier flag in a reserved portion of a data field synchronization segment in a digital television (DTV) data field identifies the presence of preamble training data in a forward error correction (FEC) encoded portion of the DTV data field. The identifier flag also indicates the code rate used for the data field. The data field synchronization segment is not FEC encoded, thereby allowing detection of the identifier flag without FEC decoding. The detection at a receiver of the identifier flag in a DTV data field allows receiver elements, such as an equalizer and a FEC decoder, to more readily obtain and utilize the preamble training data, thereby enhancing reception and/or simplifying receiver design.
    • 在数字电视(DTV)数据字段中的数据字段同步段的保留部分中的联合前导码和码率标识符标识在DTV数据字段的前向纠错(FEC)编码部分中标识前导码训练数据的存在。 标识符标志还指示用于数据字段的码率。 数据字段同步段不进行FEC编码,从而允许检测标识符标志而不进行FEC解码。 在DTV数据字段中的标识符标志的接收机处的检测允许诸如均衡器和FEC解码器的接收器元件更容易地获得和利用前导码训练数据,从而增强接收和/或简化接收机设计。