報告書番号

R00009

タイトル（和文）

高速配電線搬送シミュレ－タの開発 -OFDM通信方式を対象としたシミュレータの開発-

タイトル（英文）

Power Line Communication Simulator on Low Voltage Distribution Lines with OFDM Modulator

概要 （図表や脚注は「報告書全文」に掲載しております）

高速配電線搬送の可能性を検討するためのシミュレ－タを開発し，高速化に必要な送受信機の機能は，等化器と適応的な周波数選択を行えば高速伝送可能なことをシミュレ－ションにより示した．また，住宅地を想定した柱状変圧器下に需要家30軒あるような配電線の構成において高速伝送に必要な送信機の送信電力は85mW/10kHzであることも示した．

概要 （英文）

We have developed the simulator which can evaluate low voltage power lines as a high-speed data transmission line. At first, we measured both the signal transmission loss and the phase difference between input and output-signal on a low voltage distribution line in order to make a model of multi-path signal propagation. The loss and the phase difference fluctuate sharply in HF (High Frequency) range and signal distortion is large. Secondly, we measured noise power of household electric appliances and low voltage power lines. These are less than 70dBμV/10kHz in HF range. Using these measurement results, we developed the transmitter and receiver model which can simulate OFDM (the Orthogonal Frequency Division Multiplex) communication systems. OFDM is robust for multi-path waves. Using this model, we evaluated low voltage power lines as a high-speed data transmission line. In this system, the number of signal channel is 2048, each signal bandwidth is 200kHz, data speed is 8Mbps, a data mapping scheme is DQPSK (Differential Quadrature Phase-Shift Keying), and the center of carrier frequency is 10MHz. The following simulation results in HF range were obtained, 1. BER (Bit Error Rate) is 5×10-3 without the signal level equalization. When signal level of each channel is equalized, BER becomes 1.3×10-5. The affection of signal distortion in HF range is so large that the equalization of signal level of each channel is essential.2. Even though OFDM that is robust for multi-path waves is used, when D/U that is desired to undesired power ratio is less than 5dB, BER does not become less than 1×10-6. Under the existence of strong multi-path waves, BER will become worse. This indicates that the affection of multi-path waves must be removed by a method which can select proper frequencies.3. Transmission Power ,whose data rate is about 5.6Mbps, is about 85mW/10kHz with an equalizer and adaptive channel selection method in 24MHz.

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