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Description: spread spectrum communication will be helpful to you!-spread spectrum communication will be HE pful to you!
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Size: 712659 |
Author: yichenfu |
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Description: 本人做的一个小代码，密码学里面要用到的，网上流传的都是运行错误的，这个绝对可以-I do a small code, which use cryptography to the spread of the Internet are operational errors, This can definitely
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Size: 879616 |
Author: 王选 |
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Description: spread spectrum communication will be helpful to you!-spread spectrum communication will be HE pful to you!
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Size: 712704 |
Author: yichenfu |
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Description: 基于扩频技术的数字水印matlab源代码。大家共享之-Spread-spectrum technology based on digital watermarking matlab source code. U.S. share of
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Size: 2048 |
Author: 张娜 |
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Description: CDMA 的仿真程序，Frequency Hopping Spread Spectrum,Random frequency hopps to form a spread signal-CDMA s simulation program, Frequency Hopping Spread Spectrum, Random frequency hopps to form a spread signal
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Size: 3072 |
Author: hws |
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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.
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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.
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Size: 5120 |
Author: 杨世斌 |
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Description: This m file generates a DS BPSK transmitter(spread spectrum) using PRBS s which are modulus 2 added(exclusive ored)with the message and then used to BPSK modulate a carrier.
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Size: 1024 |
Author: Rafal |
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Description: 使用维纳分布进行瞬时频率估计用来校正电离层非线性相位污染带来的频带展宽-High-frequency (HF) sky-wave radar
signals propagate to and from the target by means
of the ionosphere. The difficulty in obtaining very
narrow beamwidths at HF, and the long ranges
involved, mean that the signal backscattered from
the ground is often several orders of magnitude
greater than the target echo. To resolve the target,
coherent signal processing techniques are necessary,
detecting the target echo by virtue of the
Doppler shift caused by the target’s radial velocity.
Unfortunately, movement of the ionospheric
layer by which the radar signal has propagated
often causes the clutter spectrum and target to
spread in the frequency domain, rendering
extended coherent integration pointless. The
movement of the ionosphere can be regarded as
producing frequency modulation of the radar
signal, and thus if this modulation can be estimated
the radar signal may be corrected for the ionospheric
contamination. A technique using the
complex argument of the first-order mo
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Size: 615424 |
Author: sunrong |
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Description: Abstract—In this paper we present an initial performance
evaluation of the 3GPP UTRA Long Term Evolution (UTRA
LTE) uplink with baseline settings. The performance results
are obtained from a detailed UTRA LTE uplink link level
simulator supporting OFDMA and SC-FDMA schemes. The basic
transmission scheme for uplink direction is based on singlecarrier
transmission in the form of DFT Spread OFDM with
an MMSE receiver. Two antenna configurations, SISO and 1x2
SIMO are considered in the analysis of spectral efficiency in
addition to Adaptive Modulation and Coding (AMC) and L1-
HARQ. For assessment purposes, the performance results of
SC-FDMA are compared with OFDMA. It is shown that 1x2
SIMO greatly increases the spectral efficiency of SC-FDMA
making it comparable to OFDMA, especially for high coding
rate. Furthermore, SC-FDMA has a flexibility to increase BLER
performance by exploiting frequency diversity.
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Size: 160768 |
Author: ashokec |
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Description: OnPerformanceLimitsofDFTSpreadOFDMSystems
DFT Spread OFDM has been proposed recently to
reduce the Peak to Average Power Ratio (PAPR) of conventional
OFDM transmission. Besides PAPR reduction, an important
implication of DFT Spreading is that the independent parallel
sub-channels between the sub-carriers cease to exist. This in
turn leads to difference in its performance limits as compared to
the conventional OFDM system. This paper analyzes the error
probabilities of DFT Spread OFDM systems, and derives their
analytical closed form expressions for the AWGN, fading AWGN,
multipath and fading multipath channel scenarios. Simulation
results presented in last section confirm the validity of the derived
analytical expressions.
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Size: 2151424 |
Author: ashokec |
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Description: channel estimation is single carrier frequency division multiple access also called as DFT spread OFDM.
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Size: 749568 |
Author: dude |
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Description: 设计一个有干扰的直接序列扩频通信系统， PN码由m序列产生器产生，经过高斯白噪声信道。在接收端接收到的信号包括“有用信号+高斯白噪声+干扰”，将接收信号进行解扩，判决，得到用户的信号检测结果，绘制不同的扩频增益（增益值为10，30，50）下，误比特率随信噪比Eb/N0的变化曲线。-Design of a direct sequence spread spectrum interference system, PN code generated by the m sequence generator, after white Gaussian noise channel. Receives the signal at the receiver, including " useful signal+ Gaussian white noise+ interference" , will receive the signal despreading, judgments, get the user' s signal test results, draw a different spreading gain (gain value of 10,30, 50), the BER curves with the signal to noise ratio Eb/N0.
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Size: 7168 |
Author: 皓月 |
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Description: s-交织器，能对序列进行交织，保证交织序列交织分散-s-interleaver, can be interleaved sequence to ensure the cutting sequence spread intertwined
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Size: 1024 |
Author: 刘阔 |
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Description: orthogonal variable spreading factor (OVSF) is an implementation of Code division multiple access (CDMA) where before each signal is transmitted, the spectrum is spread through the use of a user s code. User s codes are carefully chosen to be mutually orthogonal to each other.
These codes are derived from an OVSF code tree, and each user is given a different, unique code. An OVSF code tree is a complete binary tree that reflects the construction of Hadamard matrices.
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Size: 2048 |
Author: deep |
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Description: 基于Chaos Theory的直接序列扩频信号中的检测，并对此进行了仿真。-Chaos Theory Based on direct sequence spread spectrum signal detection, and this simulation.
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Size: 2272256 |
Author: 张洋 |
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Description: 详细讲述了直接序列扩频差分锁相环的文章，包含具体的算法结构，并附有仿真结果。-A novel differentially coherent delay-locked loop(DCDLL) for accurate code tracking is proposed for direct sequence spread spectrum systems. Due to the use of the differential
decoder and exactly one correlator, the proposed scheme avoids
the problems of gain imbalance. The tracking error variance is
derived by linear analysis. When the proposed DCDLL scheme is
applied in ranging with additive white Gaussian noise (AWGN)
channel, the performance of the proposed DCDLL scheme is
about 1.4 dB better than that of one-correlator tau–dither loop
(TDL), and near that of noncoherent DLL.
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Size: 76800 |
Author: caiyh |
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Description: 内部流传出来的天镜扫描器的源代码，很有价值。值得参考。-Spread out within days of the source code of the scanner lens, great value. Worth considering.
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Size: 4219904 |
Author: 李冰 |
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Description: the two .m file used to generate m sequence and compute two sequences s correlation properties, for example to compute two gold sequences s correlations properties
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Size: 1024 |
Author: kevin |
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Description: 应用matlab语言防真和分析了一个1个频点的跳频通信系统的扩频通信过程；防真和分析了2个跳频信号跳频点的变化情况。-Application matlab language anti-truth and an analysis of the spread spectrum communication process a frequency hopping communication system anti-truth and analyze the changes in the two frequency-hopping signal hopping points.
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Size: 6144 |
Author: 齐嘉 |
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