摘要： 视觉假体中无线能量传输效率和无线数据传输速率随着信号载频频率增大而减小。为此,提出将16DAPSK 高阶调制解调技术应用于视觉假体中。分析16DAPSK 在视觉假体中的应用优势,给出16DAPSK 超大规模集成电路(VLSI)算法和硬件结构。结合滤波器系数对称、简化的RAG 算法图等实现电路的VLSI 优化设计。基于DE4 平台完成系统硬件验证、数据传输速率、能量传输效率分析与实验。结果表明,系统工作正确,采用
16DAPSK 技术可简化电路解调硬件结构,解决信道延迟的不定性问题,提高视觉假体应用的可靠性。VLSI 优化后的硬件资源减少57% ,体积减小,提高了视觉假体临床应用的可行性。较传统低阶调制技术,16DAPSK 高阶调制在较高的数据传输速率下,载波频率的降低提高了能量传输效率,解决了能量与数据传输效率矛盾的问题。
关键词:
16DAPSK 技术,
视觉假体,
超大规模集成电路,
光幻视,
能量效率
Abstract: Considering the contradiction between the efficiency of wireless power transmission and rate of data
transmission on the choice of carrier for visual prosthesis,this paper presents 16DAPSK high-order modulation and demodulation technology for visual prosthesis application. Application advantage for 16DAPSK is analysed combined with the algorithm,then Very Large Scale Integration(VLSI) for 16DAPSK is designed and optimized by reducing circuit scales of filters with symmetrical characteristics of coefficients and RAG method. The hardware is verified on the DE4 platform as well as the efficiency of wireless power transmission and rate of data transmission. Experimental results show that the system works correctly,16DAPSK technology can solve the problem of channel delay and improve performance for visual prostheses with the simplified demodulation hardware structure. By optimizing,hardware resources are reduced by 58% ,which increases the feasibility of clinical application for visual prosthesis. Compared with traditional methods, energy efficiency experiment shows that the lower communication frequency for 16DAPSK settles the aforementioned contradiction.
Key words:
16DAPSK technology,
visual prosthesis,
Very Large Scale Integration ( VLSI ),
phosphene,
energy
efficiency
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