Antenna Subset Modulation for Secure Millimeter-Wave Wireless Communication
Antenna Subset Modulation for Secure Millimeter-Wave Wireless Communication
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DOI：
10.1109/glocomw.2013.6825166
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发表时间：
2013
影响因子：
8.3
通讯作者：
Nachiappan Valliappan;R. Heath;A. Lozano
中科院分区：
文献类型：
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作者：
Nachiappan Valliappan;R. Heath;A. Lozano
毫米波（mm-Wave）频率下的小载波波长使得能够具有大量共置天线。本文利用大型天线阵列的潜力，开发了一种低复杂度的定向调制技术，天线子集调制（ASM），用于点对点的安全无线通信。ASM的主要思想是通过仅驱动阵列中的天线子集来以符号速率调制辐射方向图。这导致定向辐射图案在期望方向上投射清晰定义的星座，并且在其他方向上进一步扩展随机化星座。提出了两种实现ASM的技术。第一种技术为每个符号随机选择天线子集。虽然随机切换天线子集不影响期望接收机沿着主方向的符号调制，但它有效地使窃听者沿着旁瓣的接收符号的幅度和相位随机化。使用一个简化的统计模型，平均未编码的符号错误率（SER）的表达式推导出作为观测角的函数。为了克服随机天线子集切换中的大旁瓣问题，第二种技术使用基于模拟退火的优化天线子集选择过程，以实现与随机选择相比的上级性能。数值比较的SER性能和保密能力的建议的技术对那些传统的阵列传输，突出ASM的潜力。
The small carrier wavelength at millimeter-wave (mm-Wave) frequencies enables featuring a large number of co-located antennas. This paper exploits the potential of large antenna arrays to develop a low-complexity directional modulation technique, Antenna Subset Modulation (ASM), for point-to-point secure wireless communication. The main idea in ASM is to modulate the radiation pattern at the symbol rate by driving only a subset of antennas in the array. This results in a directional radiation pattern that projects a sharply defined constellation in the desired direction and expanded further randomized constellation in other directions. Two techniques for implementing ASM are proposed. The first technique selects an antenna subset randomly for every symbol. While randomly switching antenna subsets does not affect the symbol modulation for a desired receiver along the main direction, it effectively randomizes the amplitude and phase of the received symbol for an eavesdropper along a sidelobe. Using a simplified statistical model, an expression for the average uncoded symbol error rate (SER) is derived as a function of the observation angle. To overcome the problem of large sidelobes in random antenna subset switching, the second technique uses an optimized antenna subset selection procedure based on simulated annealing to achieve superior performance compared with random selection. Numerical comparisons of the SER performance and secrecy capacity of the proposed techniques against those of conventional array transmission are presented to highlight the potential of ASM.