Study on construction of CDMA transmission simulator using SH3 microcomputer board

2016 Eighth International Conference on Ubiquitous and Future Networks (ICUFN) Pub Date : 2016-08-11 DOI:10.1109/ICUFN.2016.7537097

E. Kudoh, Kojiro Oka, Kenichi Suzuki

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Abstract

A lot of techniques have been studied in order to realize high-speed wireless networks. Many wireless transmission techniques are usually validated by theoretical analysis or computer simulations assuming ideal conditions. However, actual wireless transmission performance may be degraded by errors caused by hardware limitations. Therefore, validating these techniques by hardware simulations for practical use is necessary. Furthermore, the visualization of a waveform by an oscilloscope or a spectrum analyzer is helpful for promoting research. Cognitive radio systems that can adaptively change the modulation scheme by rewriting software have attracted attention. There is a great demand for general purpose, software defined wireless transmitters and receivers. We have constructed a wireless transmission simulator by using a single inexpensive H8 microcomputer board. However, transmitting 100,000 bits takes about 60 hours, making it difficult to verify transmission performance under 10-3. We also have an SH3 microcomputer that has higher processing performance than an H8 microcomputer. In this paper, we describe the construction of a CDMA wireless transmission simulator using an SH3 microcomputer board. The signal waveform has been visualized by oscilloscope, and the BER performance has been evaluated. The transmission rate when using the SH3 microcomputer board has been shown to be 140 times or higher than that when using the H8 microcomputer board.

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利用SH3单片机板构建CDMA传输模拟器的研究

为了实现高速无线网络，人们研究了许多技术。许多无线传输技术通常通过理论分析或假设理想条件的计算机模拟来验证。然而，实际的无线传输性能可能会因硬件限制引起的错误而降低。因此，有必要通过硬件模拟来验证这些技术以供实际使用。此外，用示波器或频谱分析仪将波形可视化有助于促进研究。认知无线电系统可以通过改写软件自适应地改变调制方案，引起了人们的关注。对通用的、软件定义的无线发射器和接收器有很大的需求。我们利用一块廉价的H8单片机板构建了一个无线传输模拟器。但是，传输10万比特大约需要60小时，因此很难验证10-3下的传输性能。我们还有一台比H8微机处理性能更高的SH3微机。本文介绍了一种基于SH3单片机板的CDMA无线传输模拟器的结构。用示波器对信号波形进行了可视化，并对其误码率性能进行了评价。使用SH3微型机板时的传输速率是使用H8微型机板时的传输速率的140倍或更高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2016 Eighth International Conference on Ubiquitous and Future Networks (ICUFN)

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