Research on a TCM-based Transmission Approach for EM-MWD by Combining Phase Modulation and Convolutional Coding

Cheng Zhang, H. Dong, J. Ge, Huan Liu, Jiahao Wang, W. Luo, Zhiwen Yuan, Jun Zhu, Haiyang Zhang
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引用次数: 1

Abstract

In practical applications of electromagnetic measurement while drilling (EM-MWD) in the underground coal mine, the signal-to-noise ratio (SNR) of the receiver cannot always meet the requirements of reliable communication conditions due to the earth-attenuation, interfering signal from a well site, etc. Traditional digital communication systems use independent design coding and modulation techniques to improve system performance. The coding is mainly achieved by introducing redundant bits and the improvement of error performance is at the expense of information rate. Aimed to solve this problem, we use a coding technique based on trellis coded modulation (TCM) to maximize the minimum distance between modulated output sequences and achieve significant coding gain. Simulation and experiments show that the system can improve the anti-noise performance of the system by obtaining a coding gain without reducing the transmission rate. Compared to the uncoded quadrature phase shift keying (QPSK), TCM can achieve a coding gain of at least 3 dB under the same transmitting rate. At that time, as the number of TCM system states or trace back depth increases, the coding gain is further enhanced. The TCM code modulation method can be used in an EM-MWD system to improve the system performance.
相位调制与卷积编码相结合的基于tcm的EM-MWD传输方法研究
在煤矿井下随钻电磁测量的实际应用中,由于地面衰减、井场信号干扰等原因,接收机的信噪比不能满足可靠通信条件的要求。传统的数字通信系统采用独立设计的编码和调制技术来提高系统性能。编码主要是通过引入冗余位来实现的,提高误码性能是以牺牲信息速率为代价的。为了解决这一问题,我们采用了一种基于栅格编码调制(TCM)的编码技术来最大化调制输出序列之间的最小距离,并获得显著的编码增益。仿真和实验表明,该系统在不降低传输速率的前提下获得一定的编码增益,提高了系统的抗噪声性能。与无编码正交相移键控(QPSK)相比,在相同传输速率下,TCM可以实现至少3db的编码增益。此时,随着TCM系统状态数或追溯深度的增加,编码增益进一步增强。TCM码调制方法可用于EM-MWD系统,提高系统性能。
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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