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A multidirectional transmission scheme using direct antenna modulation (DAM) based on an array with 2-bit phase control is presented. By switching each element phase properly, the line-of-sight (LOS) communication channels generated by the scheme can be independent from each other at various directions. Compared to previous work, the use of 2-bit phase control offers prospects of lower system cost and simpler phase control. An algorithmic method for calculating the required phase control for simultaneous, independent multiuser data modulation is described, and specific examples are presented.
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Shi et al. (2013) studied this question.
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