Algebraic Differential Spatial Modulation Is Capable of Approaching the Performance of Its Coherent Counterpart
Algebraic Differential Spatial Modulation Is Capable of Approaching the Performance of Its Coherent Counterpart
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DOI：
10.1109/tcomm.2017.2720170
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发表时间：
2017-10
影响因子：
8.3
通讯作者：
R. Rajashekar;Chao Xu;Naoki Ishikawa;S. Sugiura;K. Hari;L. Hanzo
中科院分区：
文献类型：
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作者：
R. Rajashekar;Chao Xu;Naoki Ishikawa;S. Sugiura;K. Hari;L. Hanzo
我们表明，某些信号星座调用经典差分编码导致一种现象，我们称之为无界差分星座大小（UDCS）。确定了存在这个问题的各种现有差动传输方案。然后，我们提出了一种增强的基于代数场扩展的差分空间调制（AFE-DSM）方案及其增强的基于分集率权衡的对应方案（AFE-DSM- dr），这两种方案都克服了UDCS问题，而不影响其全部发射分集优势。此外，为了利用所有可用的自由度，所提出的方案被扩展到包含幅度和相移键控（APSK）。此外，我们还提出了一对专门为apsk辅助差分传输方案设计的检测方案。明确地，我们设想了缓冲最小均方误差（B-MMSE）检测器和缓冲最大似然（B-ML）检测器，它们利用先前检测到的符号的知识来进一步提高检测性能。仿真结果表明，所提出的检测器能够弥补传统差分检测器（CDD）和具有全通道状态信息的相干检测器之间的性能差距。具体来说，当采用拟议的apsk辅助AFE-DSM方案时，每个通道使用的速率为2 db，观察到b - mmse和b - ml检测器相对于CDD检测器在误码率为10^{-5}$的情况下提供约3和3.5 db的信噪比增益。
We show that certain signal constellations invoked for classic differential encoding result in a phenomenon we term as the unbounded differential constellation size (UDCS). Various existing differential transmission schemes that suffer from this issue are identified. Then, we propose an enhanced algebraic field extension-based differential spatial modulation (AFE-DSM) scheme and its enhanced counterpart that strikes a diversity-rate tradeoff (AFE-DSM-DR), both of which overcome the UDCS issue without compromising its full transmit diversity advantage. Furthermore, the proposed schemes are extended to incorporate amplitude and phase shift keying (APSK) in order to exploit all the available degrees of freedom. Additionally, we propose a pair of detection schemes specially designed for APSK-aided differential transmission schemes. Explicitly, we conceive the buffered minimum mean squared error (B-MMSE) detector and buffered maximum likelihood (B-ML) detector, which exploit the knowledge of previously detected symbols in order to further improve the detection performance. Our simulation results have shown that the proposed detectors are capable of bridging the performance gap between the conventional differential detector (CDD) and the coherent detector that has full channel state information. Specifically, when employing the proposed APSK-aided AFE-DSM scheme operating at a rate of 2 b per channel use, the B-MMSE and B-ML detectors are observed to give about 3- and 3.5-dB signal-to-noise ratio gain with respect to their CDD counterpart at a bit error ratio of $10^{-5}$ .