Packet-Reliability-Based Decode-and-Forward Distributed Space-Time Shift Keying

S. Sugiura, Sheng Chen, L. Hanzo
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引用次数: 1

Abstract

Motivated by the recent concept of Space-Time Shift Keying (STSK), we propose a novel cooperative STSK scheme, which is capable of achieving a flexible rate-diversity tradeoff, in the context of cooperative space-time transmissions. More specifically, in our cooperative STSK scheme each Relay Node (RN) activates Decode-and-Forward (DF) transmissions, depending on the success or failure of Cyclic Redundancy Checking (CRC). We propose a novel bit-to STSK mapping rule, where according to the input bits, one of the Q pre-assigned dispersion vectors is activated to implicitly convey log2 Q bits, which are transmitted in combination with the classic log2(L)-bit modulated symbol. Additionally, we introduce a beneficial dispersion vector design, which enables us to dispense with symbol-level Inter-Relay Synchronization (IRS). Furthermore, the Destination Node (DN) is capable of jointly detecting the signals received from the source-destination and relay-destination links, using a low-complexity single-stream-based Maximum Likelihood (ML) detector, which is an explicit benefit of our Inter-Element Interference (IEI)-free system model. More importantly, as a benefit of its design flexibility, our cooperative STSK arrangement enables us to adapt the number of the RNs, the transmission rate as well as the achievable diversity order.
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基于包可靠性的译码转发分布式时空移位键控
受时空移位键控(STSK)概念的启发,我们提出了一种新的协同时空移位键控方案,该方案能够在协同时空传输的背景下实现灵活的速率分集权衡。更具体地说,在我们的合作STSK方案中,每个中继节点(RN)激活解码转发(DF)传输,这取决于循环冗余检查(CRC)的成功或失败。我们提出了一种新的bit-to - STSK映射规则,根据输入位,激活Q预分配色散向量中的一个隐式传输log2 Q位,并与经典的log2(L)位调制符号结合传输。此外,我们还引入了一种有益的色散矢量设计,使我们能够省去符号级中继间同步(IRS)。此外,目的节点(DN)能够使用低复杂度的基于单流的最大似然(ML)检测器联合检测从源-目的地和中继-目的地链路接收的信号,这是我们的元素间干扰(IEI)无系统模型的一个明显优点。更重要的是,由于其设计的灵活性,我们的合作STSK安排使我们能够适应rn的数量,传输速率以及可实现的分集顺序。
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