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商业通收POS系统的设计与开发
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作者 李英奇 韩冬梅 韩枫 《哈尔滨商业大学学报(自然科学版)》 CAS 1999年第4期20-24,共5页
综述了商业POS系统应具备的功能,并且根据实地POS项目的设计与开发,阐述了通收POS系统的模块设计和数据组织。
关键词 POS系统 通收 模块设计 数据组织
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借贷双方恶意串通收取“利益”如何定性
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作者 孙宗虎 《中国刑事法杂志》 1999年第6期46-47,共2页
关键词 合同法 国家利益 挪用公款罪 所有权 通收 受贿罪 利差 行为构成 贪污罪 口头约定
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中国联通在深圳推出“收付无限通”服务移动支付业务有望年内实现
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作者 刘启诚 《通信世界》 2002年第26期6-6,共1页
关键词 中国联 深圳市 付无限 移动支付业务 信息查询 业务支撑平台 MPSS
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下肢肌腹电针联合PNF技术对脑卒中偏瘫患者膝过伸的影响 被引量:2
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作者 张思鈺 王永春 +5 位作者 任慧 魏衍旭 李映彩 陈怡婷 陈斌 冷军 《神经损伤与功能重建》 2024年第1期17-20,58,共5页
目的:观察下肢肌腹电针联合PNF技术治疗脑卒中偏瘫患者膝过伸的临床疗效。方法:脑卒中伴有膝过伸障碍的80例患者随机分成电针组(26例)、PNF组(27例)、联合组(27例)。3组患者均给予脑卒中基础治疗,电针组另予下肢肌腹电针治疗,PNF组另予... 目的:观察下肢肌腹电针联合PNF技术治疗脑卒中偏瘫患者膝过伸的临床疗效。方法:脑卒中伴有膝过伸障碍的80例患者随机分成电针组(26例)、PNF组(27例)、联合组(27例)。3组患者均给予脑卒中基础治疗,电针组另予下肢肌腹电针治疗,PNF组另予PNF技术治疗,联合组给予下肢肌腹电针联合PNF技术治疗,共治疗4周。于治疗前、治疗4周后采用最大速度行走50 m时膝过伸次数、Loudon膝过伸有效率评定膝过伸;采用下肢Fugl-Meyer运动功能评分(FMA-LE)评分、起立-行走计时测试(TUGT)、步行功能分级(FAC)评定运动功能和行走功能;采用Berg平衡量表(BBS)评定平衡功能。结果:治疗4周后,3组患者FMA-LE、FAC、BBS评分较治疗前均提高(P<0.05),最大速度行走50 m时膝过伸次数及TUGT所用时间较治疗前均减少(P<0.05),且联合组治疗效果明显优于其余两组(P<0.05),电针组和PNF组比较差异无统计学意义(P>0.05),此外,联合组Loudon膝过伸有效率明显高于单一电针组和PNF组(P<0.05)。结论:下肢肌腹电针和PNF技术均可在一定程度上改善脑卒中偏瘫患者膝过伸障碍,二者联合治疗脑卒中偏瘫患者膝过伸障碍效果显著,可有效改善患者的下肢运动功能,提高膝关节稳定性及整体步行功能。 展开更多
关键词 脑卒中 膝过伸 电针 PNF技术 临床疗效
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Fluxes of soil carbon dioxide,nitrous oxide and firedamp in broad-leaved/Korean pine forest 被引量:3
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作者 肖冬梅 王淼 +2 位作者 王跃思 姬兰柱 韩世杰 《Journal of Forestry Research》 SCIE CAS CSCD 2004年第2期107-112,i001,i002,共8页
To understand influence of litters on the emission/absorption of CO2, N2O and CH4 in broadleaved/Korean pine forest in Changbai Mountain, fluxes of soil CO2, N2O and CH4 were measured by closed static chamber techniqu... To understand influence of litters on the emission/absorption of CO2, N2O and CH4 in broadleaved/Korean pine forest in Changbai Mountain, fluxes of soil CO2, N2O and CH4 were measured by closed static chamber technique, from Sept 3, 2002 to Oct 30, 2003 in two types of soil ecosystems, of which one was covered with litters on the surface soil, and the other had no litters. The results showed that litters had significant influences on CO2, N2O and CH4 fluxes (p<0.05). Their diurnal change patterns of plot with litters and litter-free plot were similar, and they all showed emission/absorption peak at 18:00. The diurnal change fluxes of CO2 and N2O of plot with litters were significantly higher than those of the litter-free plot, while the diurnal flux of CH4 of plot with litters was lower than that of litter-free plot. The fluxes of CO2, N2O, and CH4 showed the similar seasonal patternsfor both plots. The fluxes of CO2, CH4 showed their peak fluxes in June, but the fluxes of N2O showed its peak emissions in August. The annual fluxes of CO2 and N2O of plot with litters were significantly higher than those of the litter-free plot, while the annual flux of CH4 of plot with litters was lower than that of litter-free plot. Keywords Flux - CO2, N2O and CH4 - Seasonal variation - Diurnal variation CLC number S718.5 Document code A Foundation item: The study was supported by innovation research project of Institute of Appiied Ecology, Chinese Academy of Sciences (SCXZD0101-02) and National Natural Science Foundation of China (30271068)Bigraphy: XIAO Dong-mei (1979-), female, master of Institute of Applied Ecology. Chinese Academy of Sciences, Shenyang 110016. P. R. China.Responsible editor: Song Funan 展开更多
关键词 FLUX CO2 N2O and CH4 Seasonal variation Diurnal variation
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An environment-friendly control method for congestion flow ahead of expressway toll stations 被引量:2
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作者 崔洪军 郭一晴 +1 位作者 李霞 李霖 《Journal of Southeast University(English Edition)》 EI CAS 2016年第4期479-483,共5页
To alleviate the resulting increase in energy consumption and emissions and other issues caused by the traffic congestion ahead of the expressway toll station, a novel traffic flowcontrol method is put forward based o... To alleviate the resulting increase in energy consumption and emissions and other issues caused by the traffic congestion ahead of the expressway toll station, a novel traffic flowcontrol method is put forward based on the environment-friendly conception. The technical thinking of inducing the slowly moving traffic into a batch pass is determined based on the conclusion of the research, traffic flowtheory and traffic sensing detection technology. The model of stop times is established and the parameters of the system are optimized in accordance with the principle of minimizing the fuel consumption. The optimal location selection of traffic control lights and Detector 2 for queue of different lengths at toll stations are calculated based on the model. Finally, the effect of the congestion flowcontrol system is verified via the Paramics simulation system. The result shows that the control system is capable of reducing90% of fuel consumption for vehicles going through toll stations. 展开更多
关键词 traffic engineering traffic congestion traffic flow theory toll station fuel consumption
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Seasonal dynamics of gas regulation service in forest ecosystem 被引量:2
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作者 李士美 谢高地 +2 位作者 于贵瑞 张彩霞 盖力强 《Journal of Forestry Research》 SCIE CAS CSCD 2010年第1期99-103,I0004,共6页
Using the 3-year observational data from ChinaFlux (Chinese Terrestrial Ecosystem Flux Research Network), we studied the gas regulation flux dynamics and cumulative process of gas regulation value in Qianyanzhou mid... Using the 3-year observational data from ChinaFlux (Chinese Terrestrial Ecosystem Flux Research Network), we studied the gas regulation flux dynamics and cumulative process of gas regulation value in Qianyanzhou middle subtropical plantation (QYF) and Changbai Mountain temperate mixed forest (CBF). The gas regulation service was differentiated into vegetation gas regulation service and net ecosystem gas regulation service. Carbon tax approach, reforestation cost approach and industrial oxygen approach were employed to calculate gas regulation value. Results show that there was significant seasonal variation in vegetation gas regulation flux. Daily CO2 uptake fluxes averaged 82.00 kg·ha^-·d^-1 and 59.37 kg·ha^-·d^-1 and the corresponding 02 emission fluxes were 59.65 kg·ha^-·d^-1 and 43.19 kg·ha^-·d^-1 for QYF and CBF, respectively. The cumulative curves of vegetation gas regulation value always followed a sigmoid shape, and the annual gas regulation value produced by vegetation was RMB 14342.69 yuan·ha^-1 and RMB 10384.18 yuan·ha^-1 for both QYF and CBF, respectively. In terms of monthly net ecosystem gas regulation service, QYF appeared as a CO2 sink and O2 source for the whole year, while CBF appeared to be a CO2 sink and O2 source mainly in the period between May and September. The cumulative curves of net ecosystem gas regulation value presented a sigmoid ("S") shape for QYF, while a unimodal type curve for CBF. The annual net ecosystem gas regulation value was 8470.52 yuan·ha^-1 and 5091.98yuan·ha^-1 for QYF and CBF, respectively. The economic value of both the vegetation gas regulation service and net ecosystem gas regulation service were mainly produced between May and October. 展开更多
关键词 gas regulation service flux CUMULATIVE CO2 uptake O2 emission
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Experimental study on indoor environment improvement in toll booth by personalized ventilation technology 被引量:2
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作者 杨华 齐承英 +2 位作者 刘磊 金凤云 闫丙宏 《Journal of Southeast University(English Edition)》 EI CAS 2010年第2期307-310,共4页
The necessity and feasibility of the use of the personalized ventilation(PV)technology in a toll booth is described.First,the indoor environment of the toll booth equipped with a PV system is analyzed.Based on the a... The necessity and feasibility of the use of the personalized ventilation(PV)technology in a toll booth is described.First,the indoor environment of the toll booth equipped with a PV system is analyzed.Based on the analysis results,a set of equipment for controlling the indoor air quality(IAQ)of the toll booth is devised.Then,a full-scale model of the toll booth is set up in the laboratory.The airflow organization,the optimum operation parameters,and the restraint effects of the PV system on pollution are also experimentally studied.The experimental results on the air supply characteristics show that the PV system can effectively reduce the air age,improve the ventilation efficiency,and enhance the comfort and acceptability of human beings.In addition,this system plays a significant role in preventing pollution. 展开更多
关键词 personalized ventilation(PV) indoor air quality(IAQ) toll booth POLLUTION
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SOLSM Channel Estimation for W CDMA
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作者 董霄剑 尤肖虎 《Journal of Southeast University(English Edition)》 EI CAS 1999年第2期8-13,共6页
Estimation of Rayleigh fading channels using time multiplexed pilot symbols in W CDMA (FDD) is considered. Method of interpolation on a second order curve using the instantaneous channel estimation of two contiguous... Estimation of Rayleigh fading channels using time multiplexed pilot symbols in W CDMA (FDD) is considered. Method of interpolation on a second order curve using the instantaneous channel estimation of two contiguous slots based on least square method (SOLSM) is presented. It is demonstrated by computer simulations that the channel distortion on data symbols in a slot can be estimated effectively compared to the method using simple linear interpolation, and the performance of the Rake combiner is improved effectively especially in fast moving cases. 展开更多
关键词 third generation mobile communication W CDMA Rake receiver least square method
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2.5 Gbit/s monolithic ICs for optical fiber transmitter and receiver in 0.35 μm CMOS process
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作者 冯军 王志功 +5 位作者 王欢 李连鸣 黄璐 盛志伟 章丽 熊明珍 《Journal of Southeast University(English Edition)》 EI CAS 2005年第3期268-271,共4页
2.5 Gbit/s monolithic integrated circuits (ICs) for optical fiber transmitter and receiver in 0.35 μm CMOS (complementary metal-oxide-semiconductor transistor) process are presented. The transmitter, which includ... 2.5 Gbit/s monolithic integrated circuits (ICs) for optical fiber transmitter and receiver in 0.35 μm CMOS (complementary metal-oxide-semiconductor transistor) process are presented. The transmitter, which includes a 4: 1 multiplexer and a laser diode driver (LDD), has four 622 Mbit/s random signals as its inputs and gets a 2.5 Gbit/s driving signal as its output; the receiver detects a 2.5 Gbit/s random signal and gets four 622 Mbit/s signals at the output. The main circuits include a trans-impedance amplifier (TIA), a limiting amplifier, a clock and data recovery (CDR) unit, and a 1: 4 demultiplexer (DEMUX). Test results prove the logic functions of the transmitter to be right, and the 10% to 90% rise and fall times of transmitter's output data eye diagram are 211.1 ps and 200 ps, respectively. The sensitivity of the receiver is measured to be better than 20 mV. The root mean square jitter of the DEMUX's output data is 15.6 ps and that of the clock after 1: 4 frequency dividing is 1.9 ps. Two chips are both applicable to 2.5 Gbit/s optical fiber communication systems. 展开更多
关键词 optical fiber communication monolithic: transmitter RECEIVER
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“基金热”降温
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作者 张娅 《商务周刊》 2004年第10期26-26,共1页
基金热销的泡沫和潜在的市场风险初现端倪
关键词 基金公司 开放式基金产品 重仓股 股市 价值投资 机构投资者 通收 招商 持有的股票 基金运作
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以德为魂、以人为本——北京贵友有限公司信息化建设扫描
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作者 筱月 《中国经济和信息化》 1999年第7期44-44,共1页
被采访单位:北京贵友有限公司 被采访人:北京贵友有限公司电脑部部长吴卫东 对许多商家来说1998年留给他们的是灰色的记忆。商场倒闭、转产经营之声不绝于耳。但就在这样一个大环境下,北京贵友有限公司坚持“以德为魂、以人为本”的经... 被采访单位:北京贵友有限公司 被采访人:北京贵友有限公司电脑部部长吴卫东 对许多商家来说1998年留给他们的是灰色的记忆。商场倒闭、转产经营之声不绝于耳。但就在这样一个大环境下,北京贵友有限公司坚持“以德为魂、以人为本”的经营理念,“零风险购物”的服务承诺,1998年实现纯利4千多万元,取得了很好的经济效益和社会效益。 记者到贵友有限公司采访时,恰逢公司企业内部网改造。据电脑部吴卫东部长介绍此次企业内部网升级改造,一是为适应当前商业竞争形势,二来为迎面而至的电子商务做准备。据了解,北京市目前万米以上的大型商场已经有十多家。 展开更多
关键词 公司信息化 以人为本 部长 企业内部网 款机 信息化建设 升级改造 信用卡消费 通收 计算机信息管理系统
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Lazy loading algorithm for traffic assignment of road networks under fixed charge condition
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作者 赵金宝 邓卫 《Journal of Southeast University(English Edition)》 EI CAS 2011年第2期185-187,共3页
The measures of path charge are important considerations in traffic assignment of road networks. Factors, such as travel time, fixed charge and traffic congestion which affect road users' choices of trip paths, are a... The measures of path charge are important considerations in traffic assignment of road networks. Factors, such as travel time, fixed charge and traffic congestion which affect road users' choices of trip paths, are analyzed. Travelers usually decide their trip paths based on their personal habits, preferences and the information at hand. By considering both deterministic and stochastic factors which affect the value of time (VOT) during the process of path choosing, a variational inequality model is proposed to describe the problem of traffic assignment. A lazy loading algorithm for traffic assignment is designed to solve the proposed model, and the calculation steps are given. Numerical experiment results show that compared with the all-or-nothing assignment, the proposed model and the algorithm can provide more optimal traffic assignments for road networks. The results of this study can be used to optimize traffic planning and management. 展开更多
关键词 traffic assignment road networks fixed charge lazy loading algorithm
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Constrained least squares algorithm for channel vector estimation in 2-D RAKE receiver
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作者 王建明 赵春明 《Journal of Southeast University(English Edition)》 EI CAS 2003年第1期1-4,共4页
Based on the fact that the variation of tile direction of arrival (DOA) isslower than that of the channel fading, the steering vector of the desired signal is estimatedfirstly using a subspace decomposition method and... Based on the fact that the variation of tile direction of arrival (DOA) isslower than that of the channel fading, the steering vector of the desired signal is estimatedfirstly using a subspace decomposition method and then a constrained condition is configured.Traffic signals are further employed to estimate the channel vector based on the constrained leastsquares criterion. We use the iterative least squares with projection (ILSP) algorithm initializedby the pilot to get the estimation. The accuracy of channel estimation and symbol detection can beprogressively increased through the iteration procedure of the ILSP algorithm. Simulation resultsdemonstrate that the proposed algorithm improves the system performance effectively compared withthe conventional 2-D RAKE receiver. 展开更多
关键词 2-D RAKE receiver channel estimation subspace decomposition constrained least squares
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Selection of Heat Recovery Ventilators in Different Climate Zones of China 被引量:2
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作者 钟珂 赵敬德 刘加平 《Journal of Donghua University(English Edition)》 EI CAS 2007年第1期79-84,共6页
Considering four different climate zones in China, an investigation on the choice of heat recovery ventilator for the buildings with little moisture emissions is carried out. The annual composition of energy consumpti... Considering four different climate zones in China, an investigation on the choice of heat recovery ventilator for the buildings with little moisture emissions is carried out. The annual composition of energy consumption of air intake for per unitary air ventilation flow rate is evaluated by employing the testing data of climatic parameters in eight selected cities. The analysis shows that the total heat recovery is suitable in a controlled ventilation system with air humidity controlled during heating period of all the climates. For the building without air humidity controlled in winter, the sensible heat recovery ventilators can be used in severe cold and cold regions, and total heat recovery systems are more suitable for energy saving in hot summer and cold winter and hot summer and warm winter regions. 展开更多
关键词 heat recovery ventilator sensible heat latentheat climate zone heat recovery effectiveness.
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Effect of the ginsenoside Rb1 on the spontaneous contraction of intestinal smooth muscle in mice 被引量:3
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作者 Lei Xu Sui-Ping Huang 《World Journal of Gastroenterology》 SCIE CAS CSCD 2012年第38期5462-5469,共8页
AIM: To investigate the effect and the possible mechanism of ginsenoside Rb1 on small intestinal smooth muscle motility in mice. METHODS: Intestinal smooth muscle strips were isolated from male ICR mice (5 wk old), an... AIM: To investigate the effect and the possible mechanism of ginsenoside Rb1 on small intestinal smooth muscle motility in mice. METHODS: Intestinal smooth muscle strips were isolated from male ICR mice (5 wk old), and the effect of ginsenoside Rb1 on spontaneous contraction was recorded with an electrophysiolograph. The effect of ginsenoside Rb1 on ion channel currents, including the voltage-gated K + channel current (IK V ), calcium-activated potassium channel currents (IK Ca ), spontaneous transient outward currents and ATP-sensitive potassium channel current (IK ATP ), was recorded on freshly isolated single cells using the whole-cell patch clamp technique. RESULTS: Ginsenoside Rb1 dose-dependently inhibited the spontaneous contraction of intestinal smooth muscle by 21.15% ± 3.31%, 42.03% ± 8.23% and 67.23% ± 5.63% at concentrations of 25 μmol/L, 50 μmol/L and 100 μmol/L, respectively (n=5,P<0.05). The inhibitory effect of ginsenoside Rb1 on spontaneous contraction was significantly but incompletely blocked by 10 mmol/L tetraethylammonium or 0.5 mmol/L 4-aminopyridine, respectively (n=5, P<0.05). However, the inhibitory effect of ginsenoside Rb1 on spontaneous contraction was not affected by 10 μmol/L glibenclamide or 0.4 μmol/L tetrodotoxin. At the cell level, ginsenoside Rb1 increased outward potassium currents, and IK V was enhanced from 1137.71 ± 171.62 pA to 1449.73 ± 162.39 pA by 50 μmol/L Rb1 at +60 mV (n=6, P<0.05). Ginsenoside Rb1 increased IK Ca and enhanced the amplitudes of spontaneous transient outward currents from 582.77 ± 179.09 mV to 788.12 ± 278.34 mV (n=5, P<0.05). However, ginsenoside Rb1 (50 μmol/L) had no significant effect on IK ATP (n=3, P<0.05). CONCLUSION: These results suggest that ginsenoside Rb1 has an inhibitory effect on the spontaneous contraction of mouse intestinal smooth muscle mediated by the activation of IK V and IK Ca , but the K ATP channel was not involved in this effect. 展开更多
关键词 Ginsenoside Rb1 Intestinal smooth muscle Intestinal smooth muscle cell Potassium channel Spontaneous contraction Whole-cell patch clamp technique
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IMPROVED ANALYSES AND FORECASTS WITH AIRS TEMPERATURE RETRIEVALS USING THE LOCAL ENSEMBLE TRANSFORM KALMAN FILTER 被引量:3
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作者 李泓 柳俊杰 +3 位作者 艾莲娜.费尔蒂歌 尤金尼亚.康奈 埃瑞克.考斯特里奇 伊斯万.苏纽 《Journal of Tropical Meteorology》 SCIE 2011年第1期43-49,共7页
In this paper we investigate the impact of the Atmospheric Infra-Red Sounder (AIRS) temperature retrievals on data assimilation and the resulting forecasts using the four-dimensional Local Ensemble Transform Kalman Fi... In this paper we investigate the impact of the Atmospheric Infra-Red Sounder (AIRS) temperature retrievals on data assimilation and the resulting forecasts using the four-dimensional Local Ensemble Transform Kalman Filter (LETKF) data assimilation scheme and a reduced resolution version of the NCEP Global Forecast System (GFS).Our results indicate that the AIRS temperature retrievals have a significant and consistent positive impact in the Southern Hemispheric extratropics on both analyses and forecasts,which is found not only in the temperature field but also in other variables.In tropics and the Northern Hemispheric extratropics these impacts are smaller,but are still generally positive or neutral. 展开更多
关键词 AIRS retrievals data assimilation LETKF observation impact
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Potassium channel α-subunit AtKC1 negatively regulates AKTl-mediated K^+ uptake in Arabidopsis roots under Iow-K^+ stress 被引量:23
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作者 Yi Wang Liu He +2 位作者 Hao-Dong Li Jiang Xu Wei-Hua Wu 《Cell Research》 SCIE CAS CSCD 2010年第7期826-837,共12页
Potassium transporters play crucial roles in K^+ uptake and translocation in plants. However, so far little is known about the regulatory mechanism of potassium transporters. Here, we show that a Shaker-like potassiu... Potassium transporters play crucial roles in K^+ uptake and translocation in plants. However, so far little is known about the regulatory mechanism of potassium transporters. Here, we show that a Shaker-like potassium channel AtKC1, encoded by the AtLKT1 gene cloned from the Arabidopsis thaliana low-K^+ (LK)-tolerant mutant Atlktl, significantly regulates AKTl-mediated K^+ uptake under LK conditions. Under LK conditions, the Atkcl mutants maintained their root growth, whereas wild-type plants stopped their root growth. Lesion of AtKC1 significantly enhanced the tolerance of the Atkcl mutants to LK stress and markedly increased K^+ uptake and K^+ accumulation in the Atkclmutant roots under LK conditions. Electrophysiological results showed that AtKC1 inhibited the AKT1-mediated inward K^+ currents and negatively shifted the voltage dependence of AKT1 channels. These results demonstrate that the ‘silent' K^+ channel α-subunit AtKC1 negatively regulates the AKTl-mediated K^+ uptake in Arabidopsis roots and consequently alters the ratio of root-to-shoot under LK stress conditions. 展开更多
关键词 ARABIDOPSIS potassium channel low-K^+ stress AKT1 AtKC1 Arabidopsis potassium channel low-K+ stress AKT 1 AtKC 1
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Performance and Optimization for a Ground-Coupled Liquid Loop Heat Recovery Ventilation System 被引量:1
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作者 周亚素 Per FAHLEN Torbjrn LINDHOLM 《Journal of Donghua University(English Edition)》 EI CAS 2007年第6期749-755,共7页
Ground-coupled heat pumps(GCHP)are commonly used in residential heating system.To mitigate the boreholes temperature dropping with operating time,a new exhaust-air recharging system is developed.The new recharging sys... Ground-coupled heat pumps(GCHP)are commonly used in residential heating system.To mitigate the boreholes temperature dropping with operating time,a new exhaust-air recharging system is developed.The new recharging system can be used in three operational modes.In this paper,a ground-coupled heat recovery ventilation(HRV)model is discussed.A thermal model is set up to find the optimal brine flow rate and heat transfer allocation ratio between exhaust and supply coils for maximum heat recovery efficiency.Contrary to the conventional liquid-loop HRV systems,the brine temperature entering the exhaust coil never goes blow zero(0℃),and hence defrosting is needless in the ground-coupled HRV system.This can make the ground-coupled HRV system over 20% more efficient than a conventional HRV system at low outdoor temperatures. 展开更多
关键词 a ground-coupled HRV system thermal model heat recovery efficiency coils allocation ratio brine flow rate
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Multi-Channel Iterative FDE for Single Carrier Block Transmission over Underwater Acoustic Channels 被引量:3
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作者 HE Chengbing HUO Siyu +2 位作者 ZHANG Qunfei WANG Han HUANG Jianguo 《China Communications》 SCIE CSCD 2015年第8期55-61,共7页
Recently, single carrier block transmission(SCBT) has received much attention in high-rate phase-coherent underwater acoustic communication.However,minimum-mean-square-error(MMSE) linear FDE may suffer performance los... Recently, single carrier block transmission(SCBT) has received much attention in high-rate phase-coherent underwater acoustic communication.However,minimum-mean-square-error(MMSE) linear FDE may suffer performance loss in the severely time dispersive underwater acoustic channel. To combat the channel distortion, a novel multi-channel receiver with maximum ratio combining and a low complex T/4 fractional iterative frequency domain equalization(FDE) is investigated to improve diversity gain and the bit error rate(BER) performance. The proposed method has been verified by the real data from a lake underwater acoustic communication test in November 2011. At 1.8 km, the useful data rates are around 1500 and 3000 bits/s for BPSK and QPSK respectively. The results show the improvements of system performance. Compared with MMSE FDE system, the output SNR improvement is 6.9 d B, and the BER is from 10-3 to no error bits for BPSK. The output SNR improvement is 5.3 d B, and the BER is from 1.91×10-2 to 2.2×10-4for QPSK. 展开更多
关键词 underwater acoustic communi-cation single carrier multi-channel frequency domain equalization iterative processing
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