为了能够满足基站易于选址、优质快速的建站要求和易维护、低成本、高可靠的运行要求，本文对以方舱来实现一体化结构基站做出一番探讨。从系统设计的观点阐述了移动通信高性能基站天线设计的几个关键问题，介绍了智能天线技术在基站中的应用，并且用HFSS软件仿真了一种新型的对称阵子天线，该天线驻波比小于2的带宽可以达到60%，具有良好的宽频带特性。 Abstract: In order to meet the station construction requirement of easy site selection and fast base station， and meet the operational requirement of easy maintenance， low cost and high reliability， this paper discussed the unified architecture base station using shelter. Several key problems of high performance mobile communication base station Antenna were illustrated from the view of system design， the application of smart Antenna in base station was also introduced. And a novel dipole Antenna was simulated by using HFSS， the VSWR of the Antenna is less than 2， and the bandwidth was reach to 60%. So it has good broadband properties.
上传时间： 2013-11-20
上传用户：linlin
This m-file displays the time waveform for the Gaussian pulse function and the first and second derivatives of the Gaussian pulse function for a 0.5 nanosecond pulse width. Other values of pulse widths may be used by changing fs,t,t1. The program uses the actual first and second derivative equations for the Gaussian pulse waveforms. The first derivative is considered to be the monocycle or monopulse as discussed in most papers. The second derivative is the waveform generated from a dipole Antenna used in a UWB system. Other information is contained in the file.
上传时间： 2015-05-08
上传用户：leixinzhuo
本文介绍了一种基于复合右/左手（composite right/left-handed，CRLH）超材料的新型高增益的有源漏波天线(leaky-wave Antenna，LWA)。这种天线工作在边射，由无源CRLH漏波部分与放大器相互连接,重新组成一种在辐射过程中逐步增大功率泄漏的结构,从而提高天线的有效口径进而提高其增益。通过放大器的准单向特性而导致的匹配再生功能,增益还可以进一步得到提高。
标签： left-handed composite right
上传时间： 2015-10-25
上传用户：netwolf
This project aim was to build wireless software modem for data communication between two computers using an acoustic interface in the voice frequency range (20Hz– 20,000Hz). The transmitting Antenna is a speaker (frequency response of: 90Hz – 20,000Hz) and the receiving Antenna is a microphone (frequency response of: 100Hz – 16,000Hz). The test files used as information files were text files. This goal was attained both in an incoherent scheme and in a coherent scheme. Build under Matlab code, our modem uses OFDM (orthogonal frequency division multiplexing) modulation, synchronization by LMS sequence, channel estimation (no equalizer) via pilot tones. The symbols are either PSK or ASK for a constellation size of 2 or 4. To optimize the probability of error, these symbols were mapped using Gray mapping. Report
标签： communication computers software wireless
上传时间： 2014-05-29
上传用户：wangdean1101
Bubble Oscillation Algorithm. It is used to implement balancing load traffic, which is similar to what a semi-smart Antenna can do. This algorithm was figured out by Lin Du who obtained PHD in Queen Mary, University of London.
标签： Oscillation Algorithm implement balancing
上传时间： 2014-01-04
上传用户：邶刖
Coaxial feed structures are widely used in ultra-wide band Antennas . This paper modeled the characteristic of the monopole Antenna feeded by coaxial line by FDTD in the time-domiain,which showes that . Firstly, it introduced the theory of the arithmetic and the particularly realization in the calculation then it described the use in the time-domain finally it analysed several characteristics of the monopole Antenna. The arithmetic used in the microstrip Antenna is also a quick and economical way to design the Antenna.
标签： structures ultra-wide Antennas Coaxial
上传时间： 2016-06-28
上传用户：朗朗乾坤
ofdm信道特性 Channel transmission simulator Channel transmission simulator ％ ％ inputs: ％ sig2 - noise variance ％ Mt - number of Tx Antennas ％ Mr - number of Rx Antennas ％ x - vector of complex input symbols (for MIMO, this is a matrix, where each column ％ is the value of the Antenna outputs at a single time instance) ％ H - frequency selective channel - represented in block-Toeplitz form for MIMO transmission ％ N - number of symbols transmitted in OFDM frame ％ ％ outputs: ％ y - vector of channel outputs (matrix for MIMO again, just like x matrix) ％ create noise vector sequence (each row is a different Antenna, each column is a ％ different time index) note: noise is spatially and temporally white
标签： transmission simulator Channel inputs
上传时间： 2016-07-22
上传用户：kelimu
IN highly scattered enviroment，the Capacity of a MIMO channel with nt transmit Antenna and nr recieve Antenna is analyzed. The power in parallel channel (after decomposition) is distributed as water-filling algorithm
标签： enviroment scattered highly IN
上传时间： 2014-01-25
上传用户：SimonQQ
The following is a list of MATLAB codes which includes the radar absorbing material design, the Antenna pattern, the observation points generation, and the amplitude error and phase error calculations.
标签： following absorbing the includes
上传时间： 2014-01-04
上传用户：l254587896
contains pdf documents for MIMO in wirless communications, MI_NLMS adaptive beamforming algorithm for OFDM system, narrowband beamforming algorithm for smart Antenna
标签： communications beamforming algorithm documents
上传时间： 2014-01-06
上传用户：leehom61
