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Description: 3G里使用的Spreading技术演示仿真。用于教学演示的Matlab模型。A demo of spreading code generation and modulation used in 3G.-3G Lane Spreading the use of simulation technology demonstration. Teaching Demonstration for the Matlab model. A demo of spreading code generation and modulat ion used in 3G.
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Size: 7515 |
Author: meng |
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Description: Simple spreading code allocation scheme for downlink MC-CDMA
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Size: 240750 |
Author: inonunder@yahoo.com.tw |
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Description: 改变不同的扩频增益以及正弦干扰时的误码率仿真-change the spreading gain sinusoidal interference and the BER simulation
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Size: 2048 |
Author: na |
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Description: 直接序列扩频通信可以有效地抵抗来自信道中的窄带干扰。在一个直扩通信系统中,扩频是通过伪噪声序列(PN)对发送的信息数据进行调制来实现的。在接收端,原伪噪声序列和所收信号的相关运算可将窄带干扰扩展到DS信号的整个频带,使干扰等效为幅度较低频谱较平坦的噪声；同时，将DS信号解扩,恢复原始信息数据。-direct sequence spread spectrum communication can be effective resistance from the channel narrowband interference. In a DSSS system. Spreading through the sequence of pseudo-noise (PN) to send the right message to data modulation to achieve. On the receiving end, the original pseudo-noise sequence and the received signal may be related Operational narrowband interference signal DS extended to the whole band, make tampering equivalent to a lesser extent than the flat spectrum of noise; Meanwhile, the DS signal disspreaded restore the original data.
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Size: 111616 |
Author: 赵艳朝 |
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Description: 基于DSP+FPGA的扩频接收机快捕技术，一片技术文章-DSP-based FPGA spreading fast catching receiver technology, a technology article
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Size: 303104 |
Author: 高超 |
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Description: 3G里使用的Spreading技术演示仿真。用于教学演示的Matlab模型。A demo of spreading code generation and modulation used in 3G.-3G Lane Spreading the use of simulation technology demonstration. Teaching Demonstration for the Matlab model. A demo of spreading code generation and modulat ion used in 3G.
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Size: 7168 |
Author: meng |
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Description: 关于扩频通信的一些基本模块，包括扩频的抗干扰，低检测概率等性能的仿真。-on spread spectrum communications, the basic modules, including the spreading of interference, the low probability of detection properties of the simulation.
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Size: 10240 |
Author: 刘方 |
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Description: In 揚erformance of multi-carrier DS CDMA Systems?we apply a multi-carrier signaling technique to a direct-sequence CDMA system, where a data sequence multiplied by a spreading sequence modulates multiple carriers, rather than a single carrier. The receiver provides a correlator for each carrier, and the outputs of the correlators are combined with a maximal-ratio combiner. This type of signaling has the desirable properties of exhibiting a narrowband interference suppression effect, along with robustness to fading, without requiring the use of either an explicit RAKE structure or an interference suppression filter.
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Size: 357376 |
Author: ganga |
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Description: This function generates OVSF code (Orthogonal Variable SPreading Factor)
Usage:
x = ovsf(y,z)
x, the output cell array having required OVSF codes
y, number of codes required
z, array having length of each code to the base 2 i.e. 2.^2 = 4
example y = 3 z = [4 2 3]
this will give a cell array with [1x4] [1x8] [1x16]
length = 2.^n , enter n in length of array
The code is not optimized yet, user is free to optimize
do not forget to leave a comment
This is version 1 of the file, and it need optimization. More details of OVSF code can be found on wirelesscafe.wordpress.com-This function generates OVSF code (Orthogonal Variable SPreading Factor)
Usage:
x = ovsf(y,z)
x, the output cell array having required OVSF codes
y, number of codes required
z, array having length of each code to the base 2 i.e. 2.^2 = 4
example y = 3 z = [4 2 3]
this will give a cell array with [1x4] [1x8] [1x16]
length = 2.^n , enter n in length of array
The code is not optimized yet, user is free to optimize
do not forget to leave a comment
This is version 1 of the file, and it need optimization. More details of OVSF code can be found on wirelesscafe.wordpress.com
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Size: 2048 |
Author: Rafal |
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Description: OVSF code generator:
The function ovsf_code_generator takes a vector of spreading factors which OVSF codes are required followed by an integer specifying the number of elements in that vector. The function returns a vector of vectors of double, where each vector of doubles consists of the bipolar elements of the OVSF code corresponding to the spreading factor in the same position in the input vector. Thus, the output vector will have the same length as the number of spreading factors and the length of each of the the sub-vectors will be equal to the spreading factor value in the
corresponding position.-OVSF code generator:
The function ovsf_code_generator takes a vector of spreading factors which OVSF codes are required followed by an integer specifying the number of elements in that vector. The function returns a vector of vectors of double, where each vector of doubles consists of the bipolar elements of the OVSF code corresponding to the spreading factor in the same position in the input vector. Thus, the output vector will have the same length as the number of spreading factors and the length of each of the the sub-vectors will be equal to the spreading factor value in the
corresponding position.
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Size: 2048 |
Author: agur |
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Description: High-Performance 64-QAM OFDM via Carrier Interferometry Spreading Codes.
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Size: 196608 |
Author: Ikram |
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Description: this project realted tothe multi user detection of ds cdma signals.comparision is done for different spreading sequences
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Size: 575488 |
Author: subbu |
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Description: it is a code in MATLAB for calculation of bit error ratio vs signal to noise ratio , for multiuser code division multiple access .. usually in any communication system calculation of BER is very important to know the performance of system .. so in this program multiuser CDMA system is used ,, spreading is done using HADAMARD matrix .. or WALSH code .. and BER vs SIGNAL to NOISE ratio graph is computed-it is a code in MATLAB for calculation of bit error ratio vs signal to noise ratio , for multiuser code division multiple access .. usually in any communication system calculation of BER is very important to know the performance of system .. so in this program multiuser CDMA system is used ,, spreading is done using HADAMARD matrix .. or WALSH code .. and BER vs SIGNAL to NOISE ratio graph is computed
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Size: 2048 |
Author: hassan |
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Description: This program is used to analyze the effects of the spreading factor on the performance of MC-CDMA system.
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Size: 2048 |
Author: amare |
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Description: 直扩信号BPSK的仿真，采用异或移位的算法实现PN码达到扩频的目的-BPSK DS signal simulation, using different algorithms, or shift the PN code to achieve the purpose of spreading
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Size: 1024 |
Author: 关月 |
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Description: 混沌扩频序列的生成，用于混沌算法，初始种群生成-The generation of chaotic spreading sequences for the chaotic algorithms, initial population generation
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Size: 8192 |
Author: apple |
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Description: 从多普勒载波频偏对CDMA接收
信号的影响入手，提出了分段匹配滤波器和循环累加码捕获环路相结合的方法进
行扩频码的捕获，并对该方法的性能进行了分析和仿真。
-Doppler frequency offset from the carrier signal on the CDMA receiver to start the impact of proposed sub-cycle accumulation matched filter code acquisition loop and a combination of methods of spreading codes to capture, and the method of performance analysis and simulation.
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Size: 1025024 |
Author: 赵亮 |
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Description: 扩频伪码捕获方法，截获搜索策略及截获判定。-Spreading pseudo-code acquisition method, the to intercept search strategy and intercepted judgment.
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Size: 541696 |
Author: ygy |
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Description: TWO DIMENSIONAL VARIABLE SPREADING FACTOR CODES
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Size: 103424 |
Author: neha |
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Description: Spreading of energy function.
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Size: 1024 |
Author: wingnangku |
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