Description: wo former guest researchers at NIST, Maarit Melvasalo, from VTT, Finland, and Tommi Makelainen from Nokia Research Center, Finland, built a simulation of the 3GPP FDD proposal for 3G wireless. The simulation can run on Simulink or as a stand alone C-coded program. It includes the channel encoding, interleaving, rate matching, modulation, spreading(channelization), a channel model, a RAKE receiver, and the corresponding decoding functions. Both the downlink and uplink have been modelled. Platform: |
Size: 413662 |
Author:wgf08062000 |
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Description: 扩展频谱通信系统是指待传输信息的频谱用某个特定的扩频函数扩展后成为宽频带信号，送入信道中传输，再利用一定手段将其压缩，从而获取传输信息的通信系统。
在传输同样信息时所需的射频带宽，远比我们已熟知的各种调制方式要求的带宽要宽得多。扩频带宽至少是信息带宽的几十至 几万倍。-spread spectrum communication systems refer to the transmission of information with a particular spectrum of spreading function expansion into broadband signal into Channel Tunnel, and then use some of its means of compression, thus acquiring the transmission of information communication systems. In the same transmission of information necessary for RF bandwidth than we have been familiar with the various requirements of the modulation bandwidth to a much wider. Spreading information bandwidth is the bandwidth of at least a few dozen to several tens of thousands of times. Platform: |
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Author:12313 |
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Description: 用matlab simulink写的W-CDMA的仿真过程的整个代码。
包含信道编码，交织，速率匹配，调制，扩频，信道模型，RACK接收机和相应的解码程序。
本源码对整个系统进行了仿真，非常具有参考价值，对研究WCDMA系统的任何模块都有帮助-using Matlab Simulink write W-CDMA simulation of the entire code. Includes channel coding, interleaving, rate matching, modulation, spreading, Channel model, RACK receiver decoder and the corresponding procedures. The source of the entire system for simulation, the very reference value, Study on the WCDMA system will help any module Platform: |
Size: 1209344 |
Author: |
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Description: 一个四用户的扩频通信系统，扩频增益为N=16，采用Walsh码进行直接序列扩频，BPSK调制，无线信道为AWGN(加性高斯白噪声信道)信道(AWGN信道：不考虑通信信道信号时，由宽频范围描述的统计随机无线噪声。)。在接收端进行解扩，解调，判决，通过仿真得到其中一个用户的误比特率与信噪比的仿真结果。-A four-user spread spectrum communication system, spreading gain for N = 16, using Walsh code Direct Sequence Spread Spectrum, BPSK modulation, channel for AWGN (additive white Gaussian noise channel) channel (AWGN channel: do not consider communication channel signals, described by the scope of broadband wireless random statistical noise.). At the receiving end for despreading, demodulation, judgments, through the simulation to be one of a user' s bit error rate and SNR of the simulation results. Platform: |
Size: 9216 |
Author:jehuty |
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Description: 一个四用户的扩频通信系统，扩频增益为N=16，采用Walsh码进行直接序列扩频，BPSK调制，无线信道为AWGN信道。在接收端进行解扩，解调，判决，通过仿真得到其中一个用户的误比特率与信噪比的仿真结果。-A four-user spread spectrum communication system, spreading gain for N = 16, using Walsh code Direct Sequence Spread Spectrum, BPSK modulation, AWGN channel for the wireless channel. At the receiving end for despreading, demodulation, judgments, through the simulation to be one of a user' s bit error rate and SNR of the simulation results. Platform: |
Size: 1024 |
Author:林立夫 |
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Description: 设计一个四用户的扩频通信系统，扩频增益为N=16，采用Walsh码进行直接序列扩频，BPSK调制，无线信道为AWGN信道。在接收端进行解扩，解调，判决，通过仿真得到其中一个用户的误比特率与信噪比的仿真结果。-Designed a four-user spread spectrum communication system, spreading gain for N = 16, using Walsh code Direct Sequence Spread Spectrum, BPSK modulation, AWGN channel for the wireless channel. At the receiving end for despreading, demodulation, judgments, through the simulation to be one of a user' s bit error rate and SNR of the simulation results. Platform: |
Size: 5120 |
Author:杨世斌 |
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Description: 802.11b 1Mbps PHY link.
This M code simulates DBPSK modulation and barker code spreading
on a perfectly synchonized 802.11b link. It calculates the BER
rate at each EsNo (EbNo) and plots the result- 802.11b 1Mbps PHY link.
This M code simulates DBPSK modulation and barker code spreading
on a perfectly synchonized 802.11b link. It calculates the BER
rate at each EsNo (EbNo) and plots the result Platform: |
Size: 2048 |
Author:LY |
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Description: 一个四用户的扩频通信系统，扩频增益为N=16，采用Walsh码进行直接序列扩频，BPSK调制，无线信道为AWGN信道。在接收端进行解扩，解调，判决，通过仿真得到其中一个用户的误比特率与信噪比的仿真结果。-A four-user spread spectrum communication system for spreading gain N = 16, the use of Walsh codes for direct sequence spread spectrum, BPSK modulation, AWGN channel for the wireless channel. Carried out in the receiver despreading, demodulation, decision, through the simulation to be one of the user' s bit error rate and signal to noise ratio of the simulation results. Platform: |
Size: 2048 |
Author:美杏 |
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Description: WCDMA物理层matlab仿真程序，包含信道编码，交织，速率匹配，调制，扩频，信道模型，RACK接收机和相应的解码程序。-A simulation of the 3GPP FDD proposal for 3G wireless. The simulation can run on Simulink or as a stand alone C-coded program. It includes the channel encoding, interleaving, rate matching, modulation, spreading(channelization), a channel model, a RAKE receiver, and the corresponding decoding functions. Both the downlink and uplink have been modelled. Platform: |
Size: 901120 |
Author:杜建成 |
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Description: 这个仿真程序用于实现DS-CDMA通信系统仿真,包含三种扩频码的选择，QPSK调制解调，瑞利信道衰落等。-The simulation program used to implement DS-CDMA communication system simulation, including the choice of three types of spreading codes, QPSK modulation and demodulation, Rayleigh fading channel and so on. Platform: |
Size: 25600 |
Author:william |
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Description: 直接序列扩频系统（DS，Direct Sequence）又称为直接序列调制系统或伪噪声系统（PN 系统），简称为直扩系统，是目前应用较为广泛的一种扩展频谱系统。要传送的信息经伪随机序列编码后对载波进行调制。在发信端越冬用扩频序列去扩展信号的频谱，在收信端，用相同的扩频友序列进行解扩，将展宽的频谱扩展信号还原成原始信号。因为伪随机序列的速率远大于要传送信息的速率，所以受调信号的频谱宽度将远大于要传送信息的频谱宽度，帮称之为扩频-Direct sequence spread spectrum (DS, Direct Sequence) modulation system, also known as direct sequence or pseudo-noise system (PN system), referred to as direct expansion systems, is currently the more widely used as a spread spectrum system. To send the information encoded by the pseudo-random sequence of carrier modulation. End of winter in the letter to extend the signal with the spreading sequence of spectrum, in the end prepared to receive and use the same sequence spread spectrum despreading friends, broadening the spectrum to restore the original signal expansion signals. Because the rate of pseudo-random sequence is much larger than the rate of information to be sent, so the frequency spectrum by adjusting the width of the spectrum is much larger than the width of the information to be sent to help is called spread spectrum Platform: |
Size: 1024 |
Author:song |
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Description: 根据3GPP25.141协议生成测试模式下的WCDMA系统基站测试数据格式，使用MATLAB产生业务信道。包括pn9序列生成、OVSF码、扰码、调制、扩频以及各码道的功率值加权叠加。-Agreement under 3GPP25.141 generate test mode WCDMA base station test data format, using the MATLAB generate traffic channel. Including pn9 sequence generation, OVSF codes, scrambling, modulation, spreading code channel power and the value of the weighted stack. Platform: |
Size: 2048 |
Author: |
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Description: 为评估TD_SCDMA下行链路联合检测接收机的性能，使用MATLAB软件进行链路仿真，本程序主要是实现用户QPSK基带调制、扩频、加扰、形成时隙、形成子帧、以及进行脉冲形成滤波，通过加性高斯白噪声信道和瑞利衰落多径信道，信道估计、联合检测等几个主要过程，整个仿真都是在基带进行的。-Link simulation to assess the performance of the TD_SCDMA Downlink joint detection receiver using MATLAB software, this program is the main user QPSK baseband modulation, spreading, scrambling to form a slot to form a sub-frame, as well as for pulse formation filter, through an additive white Gaussian noise channels and Rayleigh fading multipath channel, channel estimation, the joint detection of several major process, the entire simulation in the baseband Platform: |
Size: 8192 |
Author:小怪 |
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Description: 对TD-SCDMA做了一个简化的仿真，主要包括QPSK调制，扩频。结果有误比特率的值和眼图，绝对可用！-A simplified simulation of TD-SCDMA, including QPSK modulation, spreading. Result of the value of the bit error rate and eye diagram, absolutely free! Platform: |
Size: 2048 |
Author:jxz |
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Description: 生成的扩频qpsk调制信号，是采用先扩频后传并转换的方式。-Spread qpsk modulation signal generated is using the first pass and converted spreading the way. Platform: |
Size: 2048 |
Author:李科 |
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Description: 本文主要利用matlab编程工具对直接序列扩频通信的捕获过程进行仿真。仿真主要基于滑动相关法的有关理论,先讨论扩频仿真中起着重要作用的m序列的生成问题,尔后讨论调制信号的产生,然后在信号的捕获中分步讨论,先对捕获的流程进行简单的仿真,再依次加入噪声和多普勒频移后进行捕获仿真-In this paper, using matlab programming tools for direct sequence spread spectrum communication capture process simulation. Simulation of the sliding correlation method is based on the theory, first discuss the simulation plays an important role in spreading the m sequence generation problem, the modulation signal generation and later discussed, and the signal captured by stepping discussion processes the captured first simple simulation, and then followed by adding noise and Doppler frequency shift after the capture simulation Platform: |
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Author:sunnysnowhi |
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Description: 1. BPSK modulation of data which ever you input (default data is
“MANIPAL REDDY”).
2. MANIPAL REDDY is changed into ASCII Format and into two-bit
format for BPSK Modulation.
3. Chaos is used for spreading the binary bit sequence.
4. Uniformly distributed Noise is added to Spread signal.
5. After reception Chaotic Chip sequence is used to recover message .
6. Filter is used for removing spikes and noise.
7. Note the filter is used is just for showing a little realisitic picture.
8. Appropriate filter should be used.
9. The original data in binary and recovered data in binary format are
compared Platform: |
Size: 5120 |
Author:Ahmed |
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Description: 实现扩频里随机信号和伪码序列的产生，以及关于生成扩频序列的MATLAB程序，并用载波信号实现2PSK调制,在接收端用非相干差分积分实现捕获-Spread spectrum signal generated in the realization and pseudo random code sequence, and generate MATLAB program about spreading sequences and achieve 2PSK modulation carrier signal at the receiving end with the capture of non-coherent differential integrator Platform: |
Size: 1024 |
Author:陈燕 |
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Description:
The main aim of our project is to simulate CDMA modem using DS-SS (Direct sequence spread spectrum) in MATLAB. Spread spectrum is basically type of modulation that spreads data transmission across available frequency band, in excess of minimum bandwidth available. We will be generating code by multiplying with pseudo random code in order to generate spread spectrum, transmitting it over a common frequency band and de-spreading the signal using same pseudo random code at the receiver. Also our aim is to simulate the de-spreading of the received CDMA signal in the presence of AWGN .
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The main aim of our project is to simulate CDMA modem using DS-SS (Direct sequence spread spectrum) in MATLAB. Spread spectrum is basically type of modulation that spreads data transmission across available frequency band, in excess of minimum bandwidth available. We will be generating code by multiplying with pseudo random code in order to generate spread spectrum, transmitting it over a common frequency band and de-spreading the signal using same pseudo random code at the receiver. Also our aim is to simulate the de-spreading of the received CDMA signal in the presence of AWGN .
Platform: |
Size: 1775616 |
Author:viks |
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Search - spreading and modulation