A Serial Concatenation of Binary-Input Nonbinary-Output Convolutional Code and Recursive Convolutional Lattice Code
A Serial Concatenation of Binary-Input Nonbinary-Output Convolutional Code and Recursive Convolutional Lattice Code
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二进制输入非二进制输出卷积码和递归卷积格码的串行串联
DOI：
10.1109/access.2018.2831255
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Ochiai Hideki
中科院分区：
文献类型：
--
作者：
Matsumine Toshiki;Ochiai Hideki
最近提出的递归卷积格码（RCLC）可以形成具有伪高斯星座的信号，并且它们的并行级联接近香农极限。一个实际的限制是，它的输入符号被限制为L2进制正交幅度调制（QAM），当L是从奇数中选择时，它具有非2的幂星座点。因此，通过RCLC对二进制信息进行编码并不简单。此外，由于它们的并行级联，信息速率被限制为每复数维度log2Lbits。在本文中，我们通过引入二进制输入非二进制输出卷积码（CC）和RCLC的串行级联来解决这些问题，其中外部CC输出与内部RCLC的输入相匹配的L进制符号。我们证明，即使L = 3，所提出的方法可以实现2位每复杂的维度，仍然是能够接近香农极限，较低的解码复杂度相比，其并行级联对应。理论分析表明，RCLC产生的星座图在实际应用中的主要缺点是其高斯分布，具有较大的峰均功率比。因此，我们进一步介绍了一种方法，以减少所提出的系统的信号动态范围。结果表明，一个显着的增益可以实现在容量方面相比，与传统的QAM信号的约束下可比的功率放大器的效率。
The recently proposed recursive convolutional lattice code (RCLC) can form a signal with pseudo-Gaussian constellations, and their parallel concatenation is shown to approach the Shannon limit. A practical limitation is that its input symbol is limited to L2-ary quadrature amplitude modulation (QAM), which has non-power-of-two constellation points when L is chosen from the odd numbers. Therefore, encoding binary information by the RCLC is not straightforward. Furthermore, the information rate is limited to log2Lbits per complex dimension due to their parallel concatenation. In this paper, we tackle these issues by introducing a serial concatenation of binary-input nonbinary-output convolutional code (CC) and the RCLC, where the outer CC outputs an L-ary symbol that is matched to the input of the inner RCLC. We demonstrate that even with L = 3, the proposed approach can achieve 2 bits per complex dimension and still is able to approach the Shannon limit with lower decoding complexity compared with its parallel concatenation counterpart. As is demonstrated through theoretical analysis, the major practical drawback of the constellation generated by the RCLC is its Gaussian-like distribution, which has large peak-to-average power ratio. Therefore, we further introduce an approach to reduce the signal dynamic range for the proposed system. It is shown that a remarkable gain can be achieved in terms of capacity compared with the conventional QAM signals under the constraint of comparable power amplifier efficiency.
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