Experimental Evaluation of JANUS Fast Modes in Very High Acoustic Frequency Bands
Experimental Evaluation of JANUS Fast Modes in Very High Acoustic Frequency Bands
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DOI：
10.1109/joe.2022.3192090
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发表时间：
2023-01
影响因子：
4.1
通讯作者：
Jinfeng Li;Y. R. Zheng
中科院分区：
文献类型：
--
作者：
Jinfeng Li;Y. R. Zheng
本文提供了对Janus声学通信标准的快速模式操作的广泛的现场测试，其中信号占用了从96到134 kHz的38 kHz的高频段，而不是标准中规定的从9.44 kHz到13.6 kHz的4.1 kHz的标称频段。固定32码片前导码和144码片基线JANUS分组使用如标准中定义的具有13个频率对的跳频二进制频移键控，而货物分组使用中心频率为115 kHZ、符号率为23ksps的单载波M-ary相移键控调制，或高达34.5kb/S的信息数据速率，具有高阶相移键控和1/2速率前向纠错码。对原有的Janus接收机算法进行了改进，改善了快速模式下的帧/符号同步，提高了基线Janus分组在困难多径信道中的译码成功率。使用基于现场可编程门阵列的硬件平台进行了10多次实验，该硬件平台由单一发射投影仪和单一接收水听器组成。实验结果表明，Janus快速模式与原始的Janus接收算法和改进的接收算法都能很好地工作，在大多数基线的Janus分组中都能产生零误码。在原始Janus接收算法存在较大误码率(BER)的困难多径信道实验中，改进的接收算法能够将30%的错误包减少到零错误。同时，数据包采用线性最小均方误差Turbo均衡器，误码率达到10−3左右。
This article presents extensive field tests of a fast-mode operation of the JANUS acoustic communication standard where the signals occupy high-frequency bands of 38 kHz spanning from 96 to 134 kHz instead of the nominal frequency band of 4.1 kHz spanning from 9.44 to 13.6 kHz specified in the standard. The fixed 32-chip preamble and the 144-chip baseline JANUS packet utilize the frequency-hopped binary frequency shift keying with 13 frequency pairs as defined in the standard while the cargo packets use the single-carrier M-ary phase shift keying modulation with a center frequency of 115 kHz and a symbol rate of 23 ksps or up to 34.5 kb/s information data rate with high-order phase shift keying (PSK) and rate-1/2 forward error correction codes. The original JANUS receiver algorithm is modified to improve the frame/symbol synchronization for the fast mode and increase the decoding success rate of the baseline JANUS packet in difficult multipath channels. More than 10 experiments were conducted using a field-programmable-gate-array-based hardware platform consisting of a single transmit projector and a single receive hydrophone. The experiment results show that the JANUS fast mode worked well with both the original JANUS receiver algorithm and the modified receiver algorithm, yielding zero bit error in most of the baseline JANUS packets. The modified receiver algorithm is able to reduce 30% of error packets to zero error in the experiment experiencing difficult multipath channels where the original JANUS receiver algorithm suffers from large bit error rates (BER). Meanwhile, the cargo packets utilize the linear minimum mean-square error turbo equalizer and achieve a BER around 10−3.