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    • 3. 发明授权
    • Transmission system with improved receiver
    • 传输系统具有改进的接收机
    • US06549574B1
    • 2003-04-15
    • US09610713
    • 2000-07-06
    • Abraham Jan De BartArie Geert Cornelis KoppelaarConstant Paul Marie Jozef Baggen
    • Abraham Jan De BartArie Geert Cornelis KoppelaarConstant Paul Marie Jozef Baggen
    • H04B166
    • H04L1/0057H04L1/0046H04L1/0054H04L1/0065H04L1/0068
    • In a transmission system for digital symbols, such as used for DVB, source symbols are encoded by a block coder (4), subjected to an interleaving operation in an interleaver and subsequently encoder in a channel encoder (8) according to one out of a plurality of possible channel codes. The output symbols of the channel encoder (8) are applied to transmit means (10). These output symbols are modulated on a carrier and applied to an antenna (12). An antenna (14) connected to a receiver (16) receives the signal transmitted by the antenna (12). Receive means (18) are arranged for amplifying and demodulating the signal received from the antenna (14). The output of the receive means (18) are applied to quantizing means (20) which convert its input signal into a quantized digital signal, before applying it to a Viterbi decoder 22. The complexity of the Viterbi decoder 22 depends on the number of quantization levels at the output of the quantization means (20). Consequently, this number of quantization levels should be not too high. On the other hand a too low number of quantization levels results in a degradation of the performance of the Viterbi detector (22). A suitable choice of the quantization levels depends also on the channel code used. According to the inventive concept of the present invention, the quantization levels are chosen in dependence on the channel code used. This channel code can be represented by the puncturing rate. In a preferred embodiment the quantization means are realized by a cascade connection of an analog to digital converter (34) and translation means (36). The translation means (36) converts the constant quantization levels at the output of the analog to digital converter (34) into quantization levels which depend on the working point of the channel code used.
    • 在诸如用于DVB的数字符号的传输系统中,源符号由块编码器(4)编码,在交织器中进行交织操作,随后在信道编码器(8)中进行编码,根据 多个可能的信道码。 信道编码器(8)的输出符号被应用于发送装置(10)。 这些输出符号在载波上被调制并施加到天线(12)。 连接到接收器(16)的天线(14)接收由天线(12)发送的信号。 接收装置(18)被布置用于放大和解调从天线(14)接收的信号。 接收装置(18)的输出被施加到量化装置(20),其将其输入信号转换成量化的数字信号,然后将其应用于维特比解码器22.维特比解码器22的复杂度取决于量化的数量 在量化装置(20)的输出处的电平。 因此,这个量化级别应该不会太高。 另一方面,量化级数太少导致维特比检测器(22)的性能下降。 量化级别的合适选择也取决于所使用的信道码。 根据本发明的发明构思,根据所使用的信道码来选择量化级别。 该信道码可以用打孔率表示。 在优选实施例中,量化装置通过模数转换器(34)和转换装置(36)的级联连接实现。 转换装置(36)将模数转换器(34)的输出处的恒定量化电平转换成取决于使用的信道码的工作点的量化电平。
    • 9. 发明授权
    • Receiver with improved decoder
    • 接收机具有改进的解码器
    • US06732324B2
    • 2004-05-04
    • US09738645
    • 2000-12-15
    • Arie Geert Cornelis Koppelaar
    • Arie Geert Cornelis Koppelaar
    • H03M1300
    • H04L1/0057H03M13/17H03M13/27H03M13/37H04L1/0045H04L1/0071
    • A receiver for receiving digital signals comprises a front end (18) for receiving RF signals and converting them into an input signal for an de-interleaver 22 for obtaining a de-interleaved signal. The output of the de-interleaver is connected to a decoder (24) which can be a Reed-Solomon decoder. The decoder (24) is able to use erasure information which indicates possible positions of errors in the de-interleaved signal for increasing the number of errors the decoder (24) can correct. In order to improve the error correcting capabilities of the receiver, this receiver comprises error prediction means (26) which predict the position of errors in the next codewords due to error bursts from the errors found in the present codeword. Such a predicted error is handled as an erasure by the decoder (24). To prevent that more erasures are presented to the decoder (24) than it can handle, it is proposed according to the present invention to determine a probability measure for all predicted errors and to present only those errors to the decoder (24) having the largest probability.
    • 用于接收数字信号的接收机包括用于接收RF信号并将它们转换成用于解交织器22的输入信号以用于获得解交织信号的前端(18)。 解交织器的输出连接到可以是里德 - 所罗门解码器的解码器(24)。 解码器(24)能够使用擦除信息,该擦除信息指示解交织信号中可能的误差位置,以增加解码器(24)可校正的错误数量。 为了提高接收机的纠错能力,该接收机包括误差预测装置(26),其由于在当前码字中发现的错误,预测由于错误突发而导致的下一个码字中的错误的位置。 这种预测误差由解码器(24)作为擦除来处理。 为了防止比解码器(24)更多的擦除被提供给解码器(24),根据本发明,提出了确定所有预测误差的概率测量,并且仅向那些具有最大值的解码器(24)呈现那些错误 可能性。