As an efficient and interference-resistant coding technique, multiple description coding (MDC) is proposed with the aim to solve the transmission unreliability problem caused by packet errors, loss or blocking delays. The integration of MDC with non-orthogonal multiple access (NOMA) scheme (MDC-NOMA) can effectively boost the robustness and throughput of the underlying system. Additionally, space-time block coding (STBC) can further enhance the system reliability with increased diversity gain, as well as reduced decoding complexity. In this paper, we propose a novel framework referred to as MDC-NOMA-STBC, in which we apply Alamouti STBC integrated with MDC and NOMA to implement more reliable transmission. Specifically, NOMA signals are constructed by superimposing the descriptions from different users, then transmitted by the base station (BS) using Alamouti STBC. In order to substantiate the performance of the proposed framework, first, we derive closed-form expressions of both the outage probability and ergodic rate for each user in a two-antenna BS scenario. Second, for multi-antenna BS, we investigate different antenna selection strategies to further enhance the outage performance under the considered framework, whose analytical expression is provided wherever possible. Third, Monte Carlo simulation results are presented to validate our theoretical framework and to corroborate the superiority of the proposed MDC-NOMA-STBC over state-of-the-art MDC-NOMA scheme. Moreover, under realistic contexts with image transmission, it is confirmed that MDC-NOMA-STBC outperforms its counterpart MDC-NOMA in terms of the peak signal-to-noise ratio and the bit error rate.

中文翻译：

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STBC辅助的多天线系统MDC-NOMA图像传输方案


多重描述编码(MDC)作为一种高效、抗干扰的编码技术，旨在解决由于分组错误、丢失或阻塞延迟引起的传输不可靠问题。 MDC与非正交多址（NOMA）方案（MDC-NOMA）的集成可以有效提升底层系统的鲁棒性和吞吐量。此外，空时块编码（STBC）可以通过增加分集增益并降低解码复杂性来进一步增强系统可靠性。在本文中，我们提出了一种称为MDC-NOMA-STBC的新颖框架，其中我们应用Alamouti STBC与MDC和NOMA集成来实现更可靠的传输。具体来说，NOMA信号是通过叠加来自不同用户的描述来构造的，然后由基站（BS）使用Alamouti STBC来发送。为了证实所提出框架的性能，首先，我们推导了双天线基站场景中每个用户的中断概率和遍历率的封闭式表达式。其次，对于多天线基站，我们研究了不同的天线选择策略，以在所考虑的框架下进一步提高断电性能，并尽可能提供其解析表达式。第三，提出了蒙特卡罗模拟结果来验证我们的理论框架并证实所提出的 MDC-NOMA-STBC 相对于最先进的 MDC-NOMA 方案的优越性。此外，在图像传输的实际环境下，证实MDC-NOMA-STBC在峰值信噪比和误码率方面优于其对应的MDC-NOMA。