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    • 27. 发明授权
    • Bandwidth-efficient concatenated trellis-coded modulation decoder and decoding method thereof
    • 带宽效率级联网格编码调制解码器及其解码方法
    • US06816556B2
    • 2004-11-09
    • US09758168
    • 2001-01-12
    • Jin-sook Kim
    • Jin-sook Kim
    • H04L2302
    • H04L1/005H03M13/256H03M13/258H03M13/2957H03M13/3988H03M13/4146H03M13/6362H03M13/6577H04L1/0041H04L1/006H04L1/0066
    • A bandwidth-efficient concatenated trellis-coded modulation (TCM) decoder which is realized by combining turbo codes having an advantage of coping effectively with a fading channel with TCM having an advantage of bandwidth efficiency, and a decoding method thereof are provided. A conventional TCM method has high bandwidth efficiency suitable for transmitting information at high speed. However, it is very sensitive to InterSymbol interference (ISI) so it is usually applied to a wire communication system rather than to a wireless communication system. A turbo code method is an error correction encoding method showing steadiness in a channel having severe ISI and having an excellent error correction ability, but has drawbacks of low data transmission rate and low bandwidth efficiency due to a low code rate. Bandwidth-efficient concatenated TCM is provided for enhancing the steadiness against ISI and-improving power and bandwidth efficiency by applying the turbo code method to a TCM having a code rate of m/(m+1) to compensate for the drawbacks of the conventional TCM and turbo codes. A newly provided decoding method in bandwidth-efficient concatenated TCM uses a SOVA algorithm, thereby reducing decoder complexity and path memory. In addition, bandwidth-efficient concatenated TCM encoder and decoder are provided such to have parallel transition, thereby reducing the complexity of the bandwidth-efficient concatenated TCM decoder. Therefore, the Bandwidth-efficient concatenated TCM is applied to a high speed wireless communication system and can increase bandwidth efficiency and coding gain.
    • 提供了一种带宽有效的级联网格编码调制(TCM)解码器,其通过组合具有有效地与具有带宽效率的优点的TCM的衰落信道有效地应用的turbo码来实现,及其解码方法。 传统的TCM方法具有高带宽效率,适用于高速传输信息。 然而,它对InterSymbol干扰(ISI)非常敏感,因此它通常应用于有线通信系统而不是无线通信系统。 涡轮编码方法是一种误差校正编码方法,其显示具有严重ISI并且具有优异的纠错能力的信道的稳定性,但由于码率低而具有低数据传输速率和低带宽效率的缺点。 提供带宽有效的级联TCM,用于通过将turbo码方法应用于码率为m /(m + 1)的TCM来补偿传统TCM的缺点,增强了对ISI的稳定性和提高功率和带宽效率 和turbo码。 带宽效率级联TCM中新提供的解码方法采用SOVA算法,从而降低了解码器的复杂度和路径记忆。 另外,带宽有效的级联TCM编码器和解码器被提供为具有并行转换,从而降低带宽有效级联TCM解码器的复杂性。 因此,将带宽有效的级联TCM应用于高速无线通信系统,并可以提高带宽效率和编码增益。