Flexible and robust transmission schemes are required to support different coded modulation modes, receiver types and channel conditions in future broadcasting systems. However, conventional low-density parity-check (LDPC) coded schemes are usually optimized towards particular scenario, and may face the problem of performance degradation in other different scenarios. In this paper, a type of quasi-cyclic spatially coupled LDPC (QC-SC-LDPC) codes, which have been recently proven to be able to universally achieve capacity over different channels under conventional belief propagation decoding, are proposed as the forward error correcting codes for broadcasting applications. Then a QC-SC-LDPC coded transmission scheme is proposed, which is capable of showing good performance in various scenarios under practical constraints of finite coupling length, smoothing parameter, uncoupled code length and number of decoding iterations. To maintain the universal property under the above constraints, a typical construction method is developed, based on which a QC-SC-LDPC code is constructed as an example. Finally, the performance and robustness of the proposed QC-SC-LDPC coded transmission scheme are demonstrated via simulations under different yet typical coded modulation modes and channel conditions.

中文翻译：

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用于广播的准循环空间耦合LDPC码

在未来的广播系统中，需要灵活和稳健的传输方案来支持不同的编码调制模式、接收器类型和信道条件。然而，传统的低密度奇偶校验（LDPC）编码方案通常是针对特定场景进行优化的，在其他不同场景下可能会面临性能下降的问题。在本文中，一种准循环空间耦合 LDPC (QC-SC-LDPC) 码最近被证明能够在传统置信传播解码下普遍实现不同信道上的容量，被提出作为前向纠错广播应用程序代码。然后提出了一种QC-SC-LDPC编码传输方案，该方案在有限耦合长度的实际约束下，能够在各种场景下表现出良好的性能，平滑参数、解耦码长和解码迭代次数。为了在上述约束条件下保持通用性，开发了一种典型的构造方法，以构造QC-SC-LDPC码为例。最后，通过在不同但典型的编码调制模式和信道条件下进行仿真，证明了所提出的 QC-SC-LDPC 编码传输方案的性能和鲁棒性。