Description: QPSK modulation system with recover loops-This is a model of a QPSK modulation system for transmission over a bandpass channel with fc = 100 Hz and B = 30 Hz and AWGN at the receiver. SRRC fi lters with excess bandwidth α = 0.18 are employed. The receiver includes an NDA timing recovery loop followed by a DD phase recovery loop. The transmitter?s symbol period is T and set to a value of 100 ms. The symbol period at the receiver is Tr. The model will produce six windows: Two constellation plots and two eye diagrams (for the real part only), at the output of the matched fi lters and after the recovery loops a plot of the phase error (output of the NCO) and a plot of the fractional timing error (used in the interpolator). The frequency off set at the receiver is denoted by deltaf. The model simulates the transmission of 8000 QPSK symbols. Platform: |
Size: 15360 |
Author:ranbowang |
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Description: QPSK信号在MATLAB上的仿真代码，载波频率为10HZ，信息速率为1Baud，信号经过带宽为2HZ的系统。-QPSK signal in the simulation of MATLAB code, the carrier frequency to 10HZ, the information rate of 1Baud, signal bandwidth of the system 2HZ. Platform: |
Size: 706560 |
Author:小武 |
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Description: This matlab code generates UWB indoor channel impulse response described in :
Cassioli, D. Win, M.Z. Molisch, A.F., "The ultra-wide bandwidth indoor channel: from statistical model to simulations," Selected Areas in Communications, IEEE Journal on , vol.20, no.6, pp. 1247-1257, Aug 2002
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=1021916&isnumber=21989
All parameters of the channel were taken from the reference paper
-This matlab code generates UWB indoor channel impulse response described in :
Cassioli, D. Win, M.Z. Molisch, A.F., "The ultra-wide bandwidth indoor channel: from statistical model to simulations," Selected Areas in Communications, IEEE Journal on , vol.20, no.6, pp. 1247-1257, Aug 2002
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=1021916&isnumber=21989
All parameters of the channel were taken from the reference paper
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Size: 38912 |
Author: |
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Description: Simulation of Residual Excited Linear Prediction (RELP) coding for speech:
This simulation give your voice or available clear wav file.This encoder have linear predictor that decreases signal s dynamic (lower quantization level). This technique also use lowpass filtering to make lower bandwidth and reconstruct it with three methods that is chosen in decoder. For example duplicate same spectrum of encoded signal that filtered in upper frequency.-Simulation of Residual Excited Linear Prediction (RELP) coding for speech:
This simulation give your voice or available clear wav file.This encoder have linear predictor that decreases signal s dynamic (lower quantization level). This technique also use lowpass filtering to make lower bandwidth and reconstruct it with three methods that is chosen in decoder. For example duplicate same spectrum of encoded signal that filtered in upper frequency. Platform: |
Size: 855040 |
Author:Ardalan |
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Description: The purpose of this project is to create a different system for processing voice signals and from which we draw useful conclusions about these brands.
More specifically, the system will first filter the voice signal with a pass bandwidth (chebyshev probably type 2) to reduce the presence of noise in it and then we can calculate:
• what limits the signal word out (segmentation)
• how are these words
• the characteristic frequency of the voice of the speaker of each file (voice pitch). -The purpose of this project is to create a different system for processing voice signals and from which we draw useful conclusions about these brands.
More specifically, the system will first filter the voice signal with a pass bandwidth (chebyshev probably type 2) to reduce the presence of noise in it and then we can calculate:
• what limits the signal word out (segmentation)
• how are these words
• the characteristic frequency of the voice of the speaker of each file (voice pitch). Platform: |
Size: 2048 |
Author:Pastel87 |
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Description: The multipath performance of a given signal/receiver combination depends on various signal and receiver parameters like signal type/modulation scheme pre correlation bandwidth and filter characteristics, chipping rate of code ,relative power levels of multipath signals ,chip spacing between correlators and type of discriminator used for tracking.
For the following analyses the influence of code multipath will be illustrated by means of multipath error envelopes.
In these diagrams, the resulting ranging errors are plotted as a function of geometric path delay .the computation of
multipath errors envelops is based on the assumption, that the direct signal component is always available and that only one
multipath signal is present-The multipath performance of a given signal/receiver combination depends on various signal and receiver parameters like signal type/modulation scheme pre correlation bandwidth and filter characteristics, chipping rate of code ,relative power levels of multipath signals ,chip spacing between correlators and type of discriminator used for tracking.
For the following analyses the influence of code multipath will be illustrated by means of multipath error envelopes.
In these diagrams, the resulting ranging errors are plotted as a function of geometric path delay .the computation of
multipath errors envelops is based on the assumption, that the direct signal component is always available and that only one
multipath signal is present Platform: |
Size: 5120 |
Author:Rafal |
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Description: 波束宽与小区覆盖大小的关系，以及半功率带宽与滚降系数的关系-Beam width and the size of cell coverage, as well as the half-power bandwidth and roll-off coefficient of the relationship between the Platform: |
Size: 1024 |
Author:施琳 |
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Description: 一种核密度估计，或者称作带宽选择的方法，可以估计二维尺度参数，至于多维以上的估计方法尚在开发，多维情况下个人经验好的方法是多次实验取较好值-kernel density estimation, bandwidth selection, two-dimensional scale parameter can be estimated ,for the multi-dimensional approaches are still under development, multi-dimensional cases, personal experience is to do the experiment many times Platform: |
Size: 623616 |
Author:苗晨 |
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Description: 本程序是matlab编写的imm（交互式多模型算法）目标跟踪程序。这种方法的特点是在各模型之间“转换”，自动调节滤波带宽，和适合机动目标的跟踪。-This program is matlab written imm (interacting multiple model algorithm) target tracking program. This method is characterized among the various models " conversion" , automatically adjust filter bandwidth, and suitable for maneuvering target tracking. Platform: |
Size: 23552 |
Author:yunguangmei |
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Description: the code describes about the aggregate scheduling , system model , bandwidth requirement , buffre requirements & the use of zigbee protocol for existing cluster tree wsn protocol that gives better output in worst case dimension protocols Platform: |
Size: 27648 |
Author:nehasharma |
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Description: N=15, 。用Hanning窗设计一线性相位带通滤波器，观察它的实际3dB和20dB带宽。N=45，重复这一设计，观察幅频和相位特性的变化，注意长度N变化的影响。-N = 15,. Hanning window design with a linear-phase band-pass filter, observe its actual 3dB and 20dB bandwidth. N = 45, repeat the design, observe the amplitude-frequency and phase characteristics of the change, pay attention to the length of N changes. Platform: |
Size: 20480 |
Author:lm |
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Description: An 8-QAM communications channel simulation in Simulink, constructed from a 16-QAM model and using an I,Q correlation receiver.
QAM (quadrature amplitude modulation) is a method of combining two amplitude-modulated (AM) signals into a single channel, thereby doubling the effective bandwidth. QAM is used with pulse amplitude modulation (PAM) in digital systems, especially in wireless applications. In a QAM signal, there are two carriers, each having the same frequency but differing in phase by 90 degrees (one quarter of a cycle, from which the term quadrature arises). One signal is called the ‘I’ signal, and the other is called the ‘Q’ signal. Mathematically, one of the signals can be represented by a sine wave, and the other by a cosine wave. The two modulated carriers are combined at the source for transmission. At the destination, the carriers are separated, the data is extracted from each, and then the data is combined into the original modulating information. -An 8-QAM communications channel simulation in Simulink, constructed from a 16-QAM model and using an I,Q correlation receiver.
QAM (quadrature amplitude modulation) is a method of combining two amplitude-modulated (AM) signals into a single channel, thereby doubling the effective bandwidth. QAM is used with pulse amplitude modulation (PAM) in digital systems, especially in wireless applications. In a QAM signal, there are two carriers, each having the same frequency but differing in phase by 90 degrees (one quarter of a cycle, from which the term quadrature arises). One signal is called the ‘I’ signal, and the other is called the ‘Q’ signal. Mathematically, one of the signals can be represented by a sine wave, and the other by a cosine wave. The two modulated carriers are combined at the source for transmission. At the destination, the carriers are separated, the data is extracted from each, and then the data is combined into the original modulating information. Platform: |
Size: 11264 |
Author:Griffin Wright |
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Description: 基于matlab的QAM调制与解调。正交振幅调制（QAM）是一种幅度和相位联合键控（APK）的调制方式。它可以提高系统可靠性，且能获得较高的信息频带利用率，是目前应用较为广泛的一种数字调制方式。
-Matlab based on the QAM modulation and demodulation. Quadrature amplitude modulation (QAM) is a joint amplitude and phase keying (APK) modulation method. It can improve system reliability, and can get higher bandwidth utilization of the information, which is the application of a relatively wide range of digital modulation methods. Platform: |
Size: 10240 |
Author:陆宇飞 |
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Description: 本文提
出了基于功率预留的准入控制策略。首先介绍一种资源分配算法，该算法将可用信
道完全分配从而实现基站发射功率最小化。在此基础上，分别为小区间切换用户和
小区内切换用户设计预留策略，并根据系统的业务载荷自适应地调整功率预留量，
从而实现GOS的最优化。
-there exists a fundamental tradeoff between bandwidth and power. In this thesis, we
propose a novel admission control scheme based on power reservation. Foremost, we
introduce a joint subchannel and power allocation algorithm for WiMAX system, which
minimizes the overall downlink transmit power by utilizing all available subchannels.
Based on this, we propose two power reservation schemes for inter-cell handoff calls and
intra-cell handoff calls, respectively. The amount of reserved power is determined in an
adaptive manner for optimizing the metric of Grade of Service(GoS).
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Size: 3750912 |
Author:punk_812 |
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Description: 为了提高移动通信系统中数据传输的有效性能,降低GMSK调制系统的误码率. 首先对GMSK调制系统进行分析,得到不同BT值GMSK调制的移动通信系统误码率和带宽的关系.通过引入具有纠错性能的编码技术,降低信息传输的误码率,提高系统的有效性. 本文给出了引入编码技术的GMSK调制系统的仿真模型,仿真结果表明,在相同的信噪比下,系统的误码率降低了1～2dB.-This paper mainly intends to improve the performance of the communication system and decrease the error bit rate of the information. First , the GMSKmodulation system was analyzed , and the relation of the BER and
bandwidth in the different BT value was obtained. By introducing the encoding technology , the error bit rate of the information was lowered so that the performance of systemwas improved. This paper presents a simulated model . The results show that the BER of the system in the same SNR can lower 1 to 2 dB. Platform: |
Size: 582656 |
Author:Jonny |
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Description: 详细阐述了设计通信网络仿真环境里的各个参数，如带宽，延迟，掉包率，等等因素，这里的网络包括了WLAN，3G以及各种业务所需的基本条件-Detail the design of communication network simulation environment, all parameters such as bandwidth, delay, substitution rate, among other factors, where the network includes a WLAN, 3G, and the basic conditions required for various services Platform: |
Size: 5120 |
Author:wu |
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Description: 线天线阵和面天线阵在MATLAB内的方向图以及半功率带宽-Antenna array and antenna array within the orientation map in MATLAB and the half-power bandwidth of Platform: |
Size: 3072 |
Author:杨康 |
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Description: 一个带通信号的中心频率为15MHz，带宽为750Hz（载波每侧各375Hz）。
（1）利用带通采样定理，确定能够无误差地恢复被采样带通信号的最小采样频率；
（2）如果使用（1）中的采样频率，试画出采样信号的频谱；
（3）从（1）中的采样频率开始，考虑增加采样频率的影响，试问增加多少采样频率可以没有混叠误差？
-The center of a bandpass frequency of 15MHz, the bandwidth is 750Hz (carrier on each side of the 375Hz). (1) the use of bandpass sampling theorem, identifying non-sampling error to restore the minimum bandpass sampling frequency (2) If (1) the sampling frequency, sampling frequency spectrum Draw (3) from (1) the sampling frequency start, consider increasing the frequency of sampling, how to increase the number of sampling frequency can be no aliasing error? Platform: |
Size: 11264 |
Author:sophy |
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