基于OFDM的高速遥传电缆调制解调器设计

Design of High-speed Cable Telemetry Modulator/Demodulator Based On OFDM

为满足成像测井仪器采集数据量大的要求,对高速电缆遥传系统中的关键环节———电缆调制解调器进行了研制。电缆调制解调器采用OFDM等编码调制技术,解决了高数据传输率和有限的电缆带宽的矛盾。介绍了正交频分复用(OFDM)技术的原理。根据该原理,设计出了高速遥传电缆调制解调器结构图和硬件框图,并作了详细阐述。给出了OFDM调制/解调流程图及其说明。所设计的电缆调制解调器经过室内测试和野外测井试验,试验表明电缆调制解调器的设计是合理可行的。

In order to meet the demand of high data volume for imaging tools, a cable Modulator/Demodulator is investigated and developed since it is the key to any high-speed cable transmission sys- tem. The Modulator/Demodulator adopts OFDM （Orthogonal Frequency Division Multiplexing） technology to solve the antinomy between the high-speed data transmission and the limited cable bandwidth. The principle of OFDM is introduced first. Based on the OFDM principle, architecture block diagram and hardware block diagram of the cable Modulator/Demodulator are designed and are described in detail. OFDM Modulation/Demodulation flowchart is also presented and elaborated. Field test results demonstrate that the cable Modulator/Demodulator design is practical and feasible.