用于生物制药中的多点无线测温系统

针对生物制药生产工艺过程中的温度测量及控制,本文介绍一种适用于生物制药生产工艺过程中的温度测量及控制系统。该系统采用一线总线制的集成温度变送,嵌入式微电脑、锂电池（或硅光电池）及蓝牙无线发送器构成的多点无线测温发送器和带蓝牙无线接收器、嵌入式微电脑和数码显示器的无线测温接收器两部分组成。无线测温接收器还具有现场总线功能...     

空间用高效激光电池研究

激光电池在空间无线能量传输领域有很大的应用前景，适合在空间无线传输中，作为能量接收器或信号接收器使用。根据空间应用场景，研制了针对808 nm波段激光的纵向串联2结薄膜激光电池。单体激光电池开路电压达到2.29 V，光电转换效率最高可达52%，电池面密度为0.03 g/cm²。为进一步提升技术成熟度，满足空间实际应用，设计了内级联结构的下一代高效激光电池。该激光电池采用半导体异质集成工艺的金属图形键合技术，为横向纵向混合串联8结结构，预计单体激光电池开路电压超过8 V，光电转换效率突破55%。     

无线

索尼CPF-IX001无线音乐播放基站内置扬声器和低音喇叭，可与电脑进行无线连接，通过802.11b/g无线技术可直接播放存储在硬盘上的音乐，该基站可与大多数网上音乐下载服务兼容，[第一段]     

DCS产品大全

HILS将现今市场上最先进的识别与定位技术，包括超宽频技术（UWB）、全球定位系统（GPS）、无线射频技术（RFID）集成在霍尼韦尔的过程自动化系统——Experion PKS过程知识系统中。通过安装在全厂不同位置，接收器可以精确定位每一名员工或者任何一件设备的位置，并将该信息发送回HILS服务器，该服务器直接将该信息反馈给操作员工作站。接收器可以利用霍尼韦尔新的OneWireless^TM网络来无线传输数据。     

基于站址优化的电力无线专网组网分析

为了有效降低电力无线专网组网成本,从优化基站建站成本的角度出发,提出了依托现有电力网中的电力塔架进行组网,重点研究了组网过程中的基站选址问题,并分别针对组网基站和新增基站提出了对应的基站选址算法。组网基站选址算法基于退火原理求基站分布的最优解,新增基站选址算法通过计算干扰函数梯度,寻找目标区域干扰信号最小的位置设置新增基站。仿真结果表明,提出的算法可靠且容易实现,可有效解决电力专网中的基站选址问题,可为降低电力无线专网组网的建站成本提供参考。     

基于nRF9E5的高压接点无线测温系统研制

分析了单片射频收发器nRF9E5的功能特性,并将其应用于无线测温系统中,设计了基于nRF9E5的高压接点无线测温系统。整个系统由多个子站(无线测温装置)、基站(无线接收管理装置)和监视计算机组成。子站工作在各个测温地点,进行温度数据采集和无线发送。基站接收子站发送的温度数据,并通过RS-485总线或RS-232串口将温度数据和运行信息转发给监视计算机。监视计算机接收基站上送的温度数据、运行信息,将接收到的温度数值进行整理分析,做出正确处理并存储于数据库。     

大坝分布式数据采集系统中通讯网络的设计

介绍由一台ＰＣ４８６／５８６作主机、一台ＭＣＳ５１系统作主站、３２台ＭＣＳ５１系统作子站的分布式数据采集通讯系统网络的设计。具有有线、无线两种通讯方式以及自动转换功能。本系统设计了专门长线发送器、接收器电路,解决了不需中继器的有线传输达１０ｋｍ以上的问题。     

无线配电通信城域网的实现

建立一个覆盖整个城市的无线通信网是实现配电自动化(DA)系统的有效方案之一。采用无线蜂窝网络技术，在城市区域内建立多个基站，使网络信号覆盖配电自动化的通信设备，可以保证自动化数据的及时采集和传输。文中介绍廊坊供电公司采用Mobitex技术实现无线城域网，包括网络的原理和构成、自动化数据业务的接人方式、通信协议转换及通信终端设计和网络的管理方式等。     

无线串行接口电路设计

简要介绍了采用TRF6900单片射频收发器,MSP430F11221微控制器和75LV4737A接口芯片构成的无线串行接口电路。     

5G基站的现状

正问:5G基站有哪些具体应用?答:5G基站是5G网络的核心设备,提供无线覆盖,实现有线通信网络与无线终端之间的无线信号传输。在技术标准中,5G网络现阶段主要工作在3000～5000兆赫兹频段。由于频率越高,信号传播过程中的衰减也越大,所以,5G网络的基站密度将更高。5G基站建设组网多采用混合分层网络,以保证5G网络的易管理、可扩展、高可靠性,同时,满足5G基站的高速数据传输业务。5G基站建设的关键技术包括抗干扰技术、大规模多入多出(MIMO)技术等。     

Fully integrated 2.45‐GHz OOK receiver for wireless sensor networks

This paper introduces an optimized receiver architecture using the current‐reuse technique to improve receiver sensitivity while minimizing power consumption. An ISM band wireless receiver with OOK modulation was implemented in the TSMC 0.18‐µm CMOS process. The receiver contains an RF front end, an LC‐tank based LO VCO, an IF amplifier and an OOK demodulator. In addition, the IF amplifier features a self‐mixing elimination mechanism which allows the BER to upgrade more than one order of magnitude. Measurement results show a sensitivity of ?63 dBm given a BER of 10^?3. Using the gain‐improving method, the sensitivity is improved by 4 dB (100‐kbps data rate). Including the bias circuit, overall power consumption is less than 383 μW under a 1.2‐V supply, providing an alternate solution for wireless radio applications. Copyright © 2016 John Wiley & Sons, Ltd.     

Wireless power charger for wearable medical devices with in‐band communication

A wireless power charger integrated circuit has been developed for wearable medical devices in a 0.18‐µm Bipolar, Complementary metal‐oxide‐semiconductor, and Lightly‐Doped Metal‐Oxide‐Semiconductor (BCDMOS) process. A passive full‐wave rectifier consisting of Schottky diodes and cross‐coupled n‐type Metal‐Oxide‐Semiconductor (nMOS) transistors performs the alternating current to direct current power conversion without any reverse leakage current. To charge a battery, a linear charger circuit follows the passive rectifier instead of a switching charger circuit for the small form factor of wearable medical devices. An in‐band communication circuit notifies the proper connection of the wireless power receiver and the battery charging status to the charging pad (wireless power transmitter) through the wireless power transmission channel. The wireless power charger integrated circuit occupies 1.44‐mm² silicon area and shows 31.7% power efficiency when the charging current is 26.6 mA. Copyright © 2015 John Wiley & Sons, Ltd.     

Quantifying the benefits of enhanced filter selectivity

Today's mobile communications market is very competitive, with wireless service providers making every effort to improve the performance of their network to retain subscribers. Coupled with the proliferation of radio-frequency signals in the environment due to the growth of all forms of wireless communication, this leads to a very challenging task - namely, to provide ubiquitous high-quality service in spite of ever-increasing interference levels. One of the tools at the disposal of the network operator to provide such service is a cryogenically cooled receiver front end for base stations, wherein each receive path consists of a high-temperature superconducting (HTS) bandpass filter followed by a cryogenically cooled low-noise amplifier. There are two primary benefits achieved by the use of this front end. The first is improved receiver sensitivity through the reduction of electrical noise generated by the front end itself. The second is the significant reduction in the effects of out-of-band interference through the highly selective filtering made possible by the use of HTS materials. While this paper addresses both receiver-sensitivity and filter-selectivity benefits, the focus is on improved out-of-band interference rejection through enhanced filter selectivity.     

无线电能传输系统的全双工FMPSK通信方法

无线电能传输WPT （wireless power transfer）系统的控制、监测等操作需要在能量发送侧和能量接收侧之间建立通信链路实现,为此提出了一种基于WPT系统的全双工调频相移键控FMPSK （frequency-modulated phase-shift keying）近场通信方法,该方法采用较小的相位调制深度来减少对能量传输的干扰,并使用频率调制器和频率解调器来保证信号传递的准确性。首先介绍了FMPSK全双工通信的总体方案设计,其次通过推导出WPT系统输出功率和效率的相应数学表达式来探究FMPSK通信方法对能量传输的影响,最后通过仿真对所提的方法进行验证,证实了能量传输受到信号通道的影响很小,同时实现了可靠稳定的全双工信号传输。     

基于LS码的分布式MIMO-CDMA系统研究

研究了基于LS码的分布式MIMO-CDMA系统结构,提出了广义的分布式MIMO系统的信道模型,给出了采用MIMO技术时发射机和接收机的结构.最后以单小区双天线的三基站收发端分布式网络为例,仿真了不同的扩频序列、基站收发端的数目和多天线与系统性能的相互关系.结果表明使用LS码扩频的分布式MIMO-CDMA系统性能比使用Walsh码扩频的MIMO-CDMA系统性能优越,基站收发端或移动台采用多天线时的性能优于单天线.     

Direct conversion receiver for radio communication systems

Direct conversion receiver (DCR) architecture, which has introduced the zero intermediate frequency (IF) approach, supports efficient wireless handset designs with a high level of integration. Transmission over wireless channels is subject to time dispersion due to multipath propagation and frequency dispersion due to Doppler effect, the design of wireless receivers are tremendously important in supporting reliable communication links. With wireless technology growing, the choice of optimal wireless receiver architecture that supports monolithic integration without performance degradation becomes an important dimension in modern handset design. The increasing demand for mobile terminals with smaller physical dimensions has led to the investigation of DCR, which supports single chip and multinode designs. Since DCR is a promising architecture for fourth generation mobile terminals, it is important to note that implementation of a certain dc offset technique does not compromise the benefits of low complexity receiver design.     

MIMO systems with antenna selection

Multiple-input-multiple-output (MIMO) wireless systems are those that have multiple antenna elements at both the transmitter and receiver. They were first investigated by computer simulations in the 1980s. Since that time, interest in MIMO systems has exploded. They are now being used for third-generation cellular systems (W-CDMA) and are discussed for future high-performance modes of the highly successful IEEE 802.11 standard for wireless local area networks. MIMO-related topics also occupy a considerable part of today's academic communications research. The multiple antennas in MIMO systems can be exploited in two different ways. One is the creation of a highly effective antenna diversity system; the other is the use of the multiple antennas for the transmission of several parallel data streams to increase the capacity of the system. This article presented an overview of MIMO systems with antenna selection. The transmitter, the receiver, or both use only the signals from a subset of the available antennas. This allows considerable reductions in the hardware expense.     

改进型共振解调器在轴承故障诊断中的应用

共振解调技术已经在旋转机械故障诊断中得到广泛应用,传统电压型共振解调器模拟电路能够实时、准确地提取低频共振带里的故障特征频率。受电压型运算放大器转换速度较低和二极管的非线性特性这两个方面的制约,通过传统电压型共振解调器的高频信号和微弱信号发生失真现象,从而造成高频噪声背景下的轴承早期故障被误诊或者漏诊。因此,提出了一种改进型共振解调器模拟电路,通过采用第2代电流传输器(CCII+)以及AB类偏置电压补偿,改善了传统电压型共振解调器中包络检波器的性能,使该设计方法在处理高频故障信号和微弱故障信号的精度均有较大提升。随后,将该电路应用于跑合试验台,对滚动轴承典型故障进行了在线诊断。实验结果表明该改进电路不仅拓宽了信号频率适用范围,而且保证了对滚动轴承早期微弱故障的准确提取。     

无线多通道表面肌电信号采集系统设计

本文设计了一种无线多通道表面肌电信号（surface electromyography,SEMG）采集系统,该系统包括多通道的无线传感器和信号接收部分。传感器可独立的穿戴于人体表面,以线形差分电极获取表面肌电信号,对其进行放大、滤波、A/D变换,并用无线的方式按本文设计的通信协议发送给接收部分。接收部分对各传感器的数据进行整合,并通过USB接口传输给电脑进行存储、显示和处理。每个传感器体积为35mm×20mm×11mm,重量仅13g（含电池）,一次充电可工作9个小时,无线通信距离达7.5m,采集到的信号噪声低于？70dB（肌电信号1mV代表0dB）。该设计大大提高了电极安放的便利性,采集设备的便携性与人体的安全性,且避免了工频干扰,能够满足基于表面肌电信号的手势或姿势识别等研究的要求。