分子通讯的空间调制
Spatial Modulation for Molecular Communication
摘要：
在本文中，我们提出了一种能量有效的基于空间调制的分子通信（SM-MC）方案，其中发送的符号由两部分组成，即，空间衍生符号和浓度衍生符号。通过将信息嵌入到单个激活的发射器纳米机器的索引中来发送空间符号。根据传统的集中移位键控（CSK）星座图绘制集中符号。SM-MC在每个符号传输周期内由一个激活的发射机实现，可以避免现有多输入多输出（MIMO）MC方案中存在的链路间干扰问题，从而实现低复杂度的符号检测和性能改善。具体地说，在我们的低复杂度方案中，空间符号首先检测的能量比较，然后通过等增益合并辅助CSK解调检测浓度符号。本文分析了SM-MC的符号出错率（SER）及其特殊情况，即基于空移键控的MC（SSK-MC），其中只传输空间符号，不调用CSK调制。最后，通过计算机模拟验证了分析结果，研究表明，在相同符号速率下，SM-MC和SSK-MC都能获得比传统MIMO-MC和单输入单输出MC（SISO-MC）更好的误码率性能。
英文摘要：
In this paper, we propose an energy-efficient spatial modulation based molecular communication (SM-MC) scheme, in which a transmitted symbol is composed of two parts, i.e., a space derived symbol and a concentration derived symbol. The space symbol is transmitted by embedding the information into the index of a single activated transmitter nanomachine. The concentration symbol is drawn according to the conventional concentration shift keying (CSK) constellation. Befitting from a single active transmitter during each symbol transmission period, SM-MC can avoid the inter-link interference problem existing in the current multiple-input multiple-output (MIMO) MC schemes, which hence enables low-complexity symbol detection and performance improvement. Specifically, in our low-complexity scheme, the space symbol is first detected by energy comparison, and then the concentration symbol is detected by the equal gain combining assisted CSK demodulation. In this paper, we analyze the symbol error rate (SER) of the SM-MC and its special case, namely the space shift keying based MC (SSK-MC), where only space symbol is transmitted and no CSK modulation is invoked. Finally, the analytical results are validated by computer simulations, and our studies demonstrate that both the SM-MC and SSK-MC are capable of achieving better SER performance than the conventional MIMO-MC and single-input single-output MC (SISO-MC) when the same symbol rate is assumed.
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