Targeting to provide reliable short-packet communications with tens of bits in machine-type networks, we investigate a novel sparse code multiple access (SCMA) scheme called delayed bit-interleaved coded SCMA (DBIC-SCMA). At the transmitter side, a delay module is introduced between each channel encoder and SCMA mapper such that data bits from different channel codewords can be mapped to an identical SCMA codeword. We present the main components and principles for the transmitter of DBIC-SCMA, followed by a pre-decoding assisted receiver design which exploits systematic and rate-adaptive properties of certain channel codes. Our simulation results show that the proposed DBIC-SCMA leads to significant improvements in error rate performance over the classical BIC-SCMA scheme.

中文翻译：

---

延迟位交织编码稀疏码多址

为了在机器类型网络中提供具有数十位的可靠短数据包通信，我们研究了一种称为延迟位交错编码 SCMA (DBIC-SCMA) 的新型稀疏码多址 (SCMA) 方案。在发射端，在每个信道编码器和 SCMA 映射器之间引入了一个延迟模块，使得来自不同信道码字的数据比特可以映射到相同的 SCMA 码字。我们介绍了 DBIC-SCMA 发射机的主要组件和原理，然后是预解码辅助接收机设计，该设计利用了某些信道代码的系统和速率自适应特性。我们的模拟结果表明，与经典的 BIC-SCMA 方案相比，所提出的 DBIC-SCMA 显着提高了错误率性能。