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2016 10th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP)最新文献

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A study of the performance of solar cells for indoor autonomous wireless sensors 用于室内自主无线传感器的太阳能电池性能研究
M. Rasheduzzaman, P. B. Pillai, A. N. C. Mendoza, Maria Merlyne De Souza
The performances of six solar cell technologies for indoor energy harvesting are assessed under a controlled light intensity of 77.40 μW/cm2. A comparison of the calculated efficiencies of crystalline (c-Si), polycrystalline (poly-Si), amorphous silicon (a-Si), perovskite, gallium arsenide (GaAs) and dye-sensitized solar cells (DSSC) shows that both DSSC and GaAs solar cells exhibit an efficiency of ~28%, whereas the efficiencies of perovskite and a-Si solar cells are 20.4% and 15.59% respectively. Considering both performance and cost, DSSC is the best choice for indoor light energy harvesting. Due to its high power density of 22.0 μW/cm2, the DSSC requires an area of 15 cm2 to charge a 3.4 mAh rechargeable battery from a nominal voltage of 2.8 to 3.0 V in 60 minutes.
在控制光强为77.40 μW/cm2的条件下,评价了6种用于室内能量收集的太阳能电池技术的性能。比较了晶体(c-Si)、多晶(poly-Si)、非晶硅(A - si)、钙钛矿、砷化镓(GaAs)和染料敏化太阳能电池(DSSC)的效率计算结果表明,DSSC和砷化镓(GaAs)太阳能电池的效率为28%,而钙钛矿和A - si太阳能电池的效率分别为20.4%和15.59%。从性能和成本两方面考虑,DSSC是室内光能收集的最佳选择。由于其22.0 μW/cm2的高功率密度,DSSC需要15 cm2的面积才能在60分钟内从2.8到3.0 V的标称电压为3.4 mAh的可充电电池充电。
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引用次数: 19
112-Gbit/s PDM-PAM4 transmission over 80-km SMF using digital coherent detection without optical amplifier 112 gbit /s PDM-PAM4传输超过80 km SMF,采用数字相干检测,无光放大器
Xian Zhou, K. Zhong, Jiahao Huo, Yiguang Wang, Liang Wang, J. Tu, Yanfu Yang, Lei Gao, L. Zeng, Changyuan Yu, A. Lau, Chao Lu
In this work, we experimentally demonstrated a 112 Gbit/s polarization-division-multiplexed (PDM) four-level pulse amplitude modulation (PAM4) transmission over 80-km single mode fiber (SMF) using digital coherent detection without optical amplifier and CD compensation for the short reach applications. Here, a signal-phase aided least-mean-square (SP-LMS) equalization algorithm is proposed to avoid the effects of carrier frequency offset and phase noise. Without additional carrier recovery algorithms, the PDM-PAM4 system shows good transmission performance. The received optical power (ROP) penalty is only about 0.2 dB after 80 km transmission comparing to back-to-back (BTB) transmission. A receiver sensitivity of -20dBm (at 7% FEC limit) can be reached after 80-km transmission.
在这项工作中,我们实验证明了112 Gbit/s的偏振分复用(PDM)四电平脉冲幅度调制(PAM4)在80公里单模光纤(SMF)上的传输,使用数字相干检测,无需光放大器和CD补偿,用于短距离应用。为了避免载波频偏和相位噪声的影响,提出了一种信号相位辅助最小均方(SP-LMS)均衡算法。在没有附加载波恢复算法的情况下,PDM-PAM4系统具有良好的传输性能。与背靠背(BTB)传输相比,80公里传输后的接收光功率(ROP)损失仅为0.2 dB左右。在80公里传输后,接收器灵敏度可达到-20dBm (7% FEC限制)。
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引用次数: 1
Using curve fitting for spectral reflectance curves intervals in order to hyperspectral data compression 采用曲线拟合的方法对光谱反射率曲线区间进行拟合,以达到高光谱数据压缩的目的
Mersedeh Beitollahi, S. A. Hosseini, abolfazl. hosseini
Hyperspectral (HS) images due to the simultaneous data acquisition in hundreds of narrow and close spectral bands, have high between bands correlation. In order to storage and transformation, they need to be compressed. A number of lossy/lossless methods have been developed for data compression in spatial or spectral domain. Spectral information of HS data has much more of importance than spatial information; therefore compression should be done in such a way that the spectral information is well preserved. In this paper, a lossy compression technique in the spectral domain is proposed by using curve fitting. The method has better performance compared to data compressing method using principal component analysis. In the presented method, the spectral reflectance curve (SRC) of each pixel is divided into a few non-overlapping intervals based on a specific criterion, and then, a polynomial function is fitted on each interval. The calculated coefficients of each fitted curve are considered as the new features of that section of the SRC. The experimental results show that the compressed data after the recovery is very similar to the original data.
高光谱(HS)图像由于同时采集了数百个窄带和近波段的数据,因此具有很高的波段间相关性。为了存储和转换,它们需要被压缩。在空间或谱域的数据压缩中已经发展了许多有损/无损的方法。HS数据的光谱信息比空间信息更重要;因此,压缩应该以这样一种方式进行,即光谱信息被很好地保存。本文提出了一种基于曲线拟合的谱域有损压缩技术。与基于主成分分析的数据压缩方法相比,该方法具有更好的性能。该方法将每个像元的光谱反射率曲线(SRC)根据特定的准则划分为几个不重叠的区间,然后在每个区间上拟合一个多项式函数。每条拟合曲线的计算系数被视为该截面的新特征。实验结果表明,恢复后的压缩数据与原始数据非常相似。
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引用次数: 5
Accuracy of jitter and shimmer measurements for speaker in the database TIMIT and NTIMIT TIMIT和NTIMIT数据库中扬声器抖动和闪烁测量的精度
I. Daly, Michal Novotný, Zied Hajaiej, Ali Garsallah
In this work we present the method that we have adopted in order to leave in search of the speaker through different measures of jitter and shimmer are measures of the fundamental frequency and of amplitude variations cycle to cycle. We have used these two indices as they characterize some aspects concerning the Voice individuals, so it helps us to have a certain degree of specificity of speaker. This study thus allows us on the one hand to better understand where these indices to discriminate the speakers and sets out criteria to distinguish the quality of the signal according to the conditions of registration for the automatic recognition of the speaker with the base TIMIT and NTIMIT.
在这项工作中,我们提出了我们所采用的方法,以便通过不同的抖动和闪烁测量来寻找说话者,这些测量是基频和幅值变化周期的测量。我们之所以使用这两个指标,是因为它们表征了语音个体的某些方面,因此它有助于我们对说话人有一定程度的特异性。因此,本研究一方面使我们能够更好地了解这些指标在哪里区分说话人,并根据自动识别说话人的基本TIMIT和NTIMIT的注册条件,制定了区分信号质量的标准。
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引用次数: 2
Radio over WDM-PON by spatial multiplexing in few mode fiber WDM-PON无线电在少模光纤中的空间复用
S. You, Y. Wang, Zhen Wang, Mengchi Chen, Xiang Li, Ming Luo, Ying Qiu, Rong Hu, Qi Yang, Jian Chen
In this paper, we propose mode division multiplexing in radio over fiber transmission system to increase the channel capacity in the uplink of wavelength division multiplexing (WDM) passive optical networks (PONs). The experiment is demonstrated in a 2×2 multiple input multiple output (MIMO) OFDM radio over fiber system including both wireless transmission and two-mode few-mode fiber (FMF) transmission. The MIMO digital signal processing algorithm can successfully compensate the crosstalk induced in wireless and FMF transmissions.
为了提高波分复用(WDM)无源光网络(PONs)上行链路的信道容量,本文提出了光纤无线传输系统中的模分复用技术。实验在2×2多输入多输出(MIMO)光纤OFDM无线电系统中进行了演示,该系统包括无线传输和双模少模光纤(FMF)传输。MIMO数字信号处理算法可以成功地补偿无线和FMF传输中产生的串扰。
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引用次数: 1
Non-binary turbo codes on additive impulsive noise channels 加性脉冲噪声信道上的非二进制turbo码
Wael Abd-Alaziz, M. Johnston, S. L. Goff
It is well known that binary error-correcting codes with iterative decoders can achieve near Shannon-limit performance on the additive white Gaussian noise (AWGN) channel, but their performance on more realistic wireless channels can become degraded due to the presence of burst errors or impulsive noise due to interference. A better performing coding scheme is the class of non-binary codes, which are known to be more effective in correcting burst errors, but interestingly there is no research reported in the literature investigating non-binary codes on impulsive noise channels. In this paper, we investigate the performance of non-binary turbo codes defined in a finite field GF(4) on symmetric alpha-stable impulsive noise channels and compare with comparable binary turbo codes. A Cauchy receiver is also employed to mitigate the effects of the channel to assist the turbo decoding. Our simulation results show that although the non-binary turbo code performs similarly to the binary turbo code on the AWGN channel, it achieves a significant coding gain over the binary turbo code as impulsiveness increases.
众所周知,具有迭代解码器的二进制纠错码在加性高斯白噪声(AWGN)信道上可以实现接近香农极限的性能,但在更现实的无线信道上,由于干扰导致的突发误差或脉冲噪声的存在,其性能会下降。一种性能更好的编码方案是非二进制码,它可以更有效地纠正突发错误,但有趣的是,没有文献报道研究脉冲噪声信道上的非二进制码。本文研究了有限域GF(4)中定义的非二进制turbo码在对称稳定脉冲噪声信道上的性能,并与可比较的二进制turbo码进行了比较。柯西接收器也被用来减轻信道的影响,以协助turbo解码。仿真结果表明,尽管非二进制turbo码在AWGN信道上的性能与二进制turbo码相似,但随着冲量的增加,它比二进制turbo码获得了显著的编码增益。
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引用次数: 3
Performance of eU-OFDM based relay-assisted visible light communications 基于eU-OFDM的中继辅助可见光通信性能研究
Gerard Djengomemgoto, Omer Narmanlioglu, M. Uysal
In this paper, we consider relay-assisted visible light communication (VLC) system where intermediate light source cooperates with main light source. Following IEEE 802.15.7r VLC reference channel model, we assume presence of two difference light sources in office space. First one is information source employed on ceiling and second one is desk lamp. Our system builds upon enhanced unipolar optical orthogonal frequency division multiplexing (eU-OFDM) where task light performs amplify-and-forward relaying to assist the communication and operates in half-duplex mode. We investigate bit error rate performance of relay-assisted VLC system and demonstrate that cooperation brings significant performance gains over direct transmission.
本文研究了中间光源与主光源协同工作的中继辅助可见光通信(VLC)系统。根据IEEE 802.15.7r VLC参考通道模型,我们假设在办公空间中存在两种不同的光源。第一个是天花板上的信息源,第二个是台灯。我们的系统建立在增强型单极光正交频分复用(eU-OFDM)之上,其中任务灯执行放大和转发中继以辅助通信,并以半双工模式运行。我们研究了中继辅助VLC系统的误码率性能,并证明了与直接传输相比,合作带来了显著的性能提升。
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引用次数: 4
Efficient transmission under low dimming control levels in indoor visible light communications 低调光控制水平下室内可见光通信的高效传输
Xiaodi You, Jian Chen, Changyuan Yu, Zabih Ghassemlooy
In indoor visible light communication (VLC) systems based on orthogonal frequency division multiplexing (OFDM), employing multi-pulse position modulation (MPPM) for dimming control will affect the receiver (Rx) sensitivity requirement particularly at low dimming levels (DLs), thus affecting the system bit error rate (BER) performance. In this paper, we propose a hybrid visible light (VL) and infrared (IR) link, where the IR is used for downlink when the DL for VLC is very low. The “off” periods of MPPM is utilized for data transmission without affecting the illumination level. This arrangement will ensure data transmission under all illumination and dark conditions. Numerical results show that by adopting the IR link, low level M-ary quadrature amplitude modulation can be always used. At low DLs, both the Rx sensitivity requirement of the VL signal and the required transmit power can be significantly alleviated while keeping a constant data rate at a BER <; 10-3.
在基于正交频分复用(OFDM)的室内可见光通信(VLC)系统中,采用多脉冲位置调制(MPPM)进行调光控制会影响接收机(Rx)的灵敏度要求,特别是在低调光水平(dl)下,从而影响系统的误码率(BER)性能。在本文中,我们提出了一种混合可见光(VL)和红外(IR)链路,当VLC的DL很低时,红外用作下行链路。MPPM的“关闭”时段用于数据传输而不影响照明水平。这种安排将确保在所有照明和黑暗条件下的数据传输。数值计算结果表明,采用红外链路可以实现低电平正交调幅。在较低的误码率下,VL信号的Rx灵敏度要求和所需的发射功率都可以显著降低,同时在BER <时保持恒定的数据速率;三分。
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引用次数: 2
Exact perfect reconstruction of filter window bank with application to incompatible nonuniform filter banks 滤波器窗组的精确重构及其在不相容非均匀滤波器组中的应用
Qing Liu, Xiao-Zhi Zhang, W. Ling, Meilin Wang, Qingyun Dai
This paper proposes a filter window bank structure. It consists of a bank of single input single output analysis linear time invariant filters, a bank of analysis periodic windows, a bank of single input single output synthesis linear time invariant filters and a bank of synthesis periodic windows. Since the joint downsampling functions and the upsampling functions in conventional uniform filter banks, conventional nonuniform filter banks, conventional uniform block filter banks and conventional nonuniform block filter banks are particular types of periodic window functions, these conventional filter banks are particular types of the proposed filter window banks. This paper derives the exact perfect reconstruction conditions for the proposed filter window banks with both the constant and the time varying synthesis periodic window functions. Finally, the filter window banks with both the constant synthesis periodic window functions and the time varying periodic window functions are compared to conventional nonuniform filter banks and conventional nonuniform block filter banks.
本文提出了一种滤波窗口组结构。它由一组单输入单输出分析线性时不变滤波器、一组分析周期窗、一组单输入单输出合成线性时不变滤波器和一组合成周期窗组成。由于常规均匀滤波器组、常规非均匀滤波器组、常规均匀块滤波器组和常规非均匀块滤波器组中的联合下采样函数和上采样函数是特定类型的周期窗口函数,因此这些常规滤波器组是所提出的滤波器窗口组的特定类型。本文导出了具有常变和时变合成周期窗函数的滤波器窗组的精确完美重构条件。最后,将具有恒定合成周期窗函数和时变周期窗函数的滤波器窗组与常规非均匀滤波器组和常规非均匀块滤波器组进行了比较。
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引用次数: 1
Using genetic algorithm for advanced municipal waste collection in Smart City 基于遗传算法的智慧城市高级城市垃圾收集
R. Fujdiak, Pavel Mašek, P. Mlynek, J. Misurec, Ekaterina Olshannikova
The Internet of Things (IoT), as expected infrastructure for envisioned concept of Smart City, brings new possibilities for the city management. IoT vision introduces promising and economical solutions for massive data collection and its analysis which can be applied in many domains and so make them operating more efficiently. In this paper, we are discussing one of the most challenging issues - municipal waste-collection within the Smart City. To optimize the logistic procedure of waste collection, we use own genetic algorithm implementation. The presented solution provides calculation of more efficient garbage-truck routes. As an output, we provide a set of simulations focused on mentioned area. All our algorithms are implemented within the integrated simulation framework which is developed as an open source solution with respect to future modifications.
物联网作为智慧城市的基础设施,为城市管理带来了新的可能性。物联网视觉为大量数据收集及其分析引入了有前途和经济的解决方案,这些解决方案可以应用于许多领域,从而使它们更有效地运行。在本文中,我们讨论了最具挑战性的问题之一——智慧城市中的城市垃圾收集。为了优化垃圾收集的物流流程,我们采用了自己的遗传算法实现。提出的解决方案提供了更有效的垃圾车路线的计算。作为输出,我们提供了一组针对上述领域的模拟。我们所有的算法都是在集成的仿真框架内实现的,该框架是作为开源解决方案开发的,以便将来进行修改。
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引用次数: 55
期刊
2016 10th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP)
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