Description: This paper considers receiver designs for
SC-FDE schemes (Single-Carrier with Frequency-Domain
Equalization) employing M-ary OQAM signals (Offset
Quadrature Amplitude Modulation). It is shown that the
interference between the in-phase (I) and quadrature (Q)
components at the sampling points can lead to severe
performance degradation. Therefore, receivers without
residual I-Q interference (IQI), as well as receivers with
IQI cancellation were developed. Our performance results
show that the new receivers are suitable to M-ary OQAM
schemes. Platform: |
Size: 421888 |
Author:吕立圣 |
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Description: 两个频率的凹口滤波的干扰对消噪声，采用了SER算法，可以和LMS算法来做比较。-Filtering the interference of the two frequencies of the recess on the noise-cancellation of the SER algorithm, and the LMS algorithm for comparison. Platform: |
Size: 1024 |
Author:zhouguoxin |
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Description: Abstract— Very-high-speed digital subscriber loop modems
operate in frequency bands, which coincide with many significant
radio-frequency interference sources, particularly commercial
AM radio. In these bands, the balance of most twisted-pair cables
is low enough to allow substantial interference to transfer to
differential mode, disrupting the transmitted information signal.
A novel wideband common-mode noise cancellation technique is
presented. Simulation results show that the common-mode noise
cancellation technique could provide 20- to 30-dB improvement
in those radio frequency bands. Construction and testing of a
hardware prototype are also presented. With finite-precision
effects, measured test results show that common-mode noise
cancellation in the order of 15–20 dB is achievable. Platform: |
Size: 1042432 |
Author:manar |
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Description: Adaptive filtering constitutes one of the core technologies in digital signal processing and finds numerous application areas in science as well as in dustry. Adaptive filtering techniques are used in a wide range of applications, including echo cancellation, adaptive equalization, adaptive noise cancellation, and adaptive beamforming. Acoustic echo cancellation is a common occurrence in today’s telecommunication systems. The signal interference caused by acoustic echo is distracting to users and causes a reduction in the quality of the communication. This paper focuses on the use of LMS and NLMS algorithms to reduce this unwanted echo, thus increasing communication quality. -Adaptive filtering constitutes one of the core technologies in digital signal processing and finds numerous application areas in science as well as in industry. Adaptive filtering techniques are used in a wide range of applications, including echo cancellation, adaptive equalization, adaptive noise cancellation, and adaptive beamforming. Acoustic echo cancellation is a common occurrence in today’s telecommunication systems. The signal interference caused by acoustic echo is distracting to users and causes a reduction in the quality of the communication. This paper focuses on the use of LMS and NLMS algorithms to reduce this unwanted echo, thus increasing communication quality. Platform: |
Size: 1576960 |
Author:huan |
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Description: 随着带宽的增加和环路距离的减小,串音(Crosstalk)已经成为VDSL2系统中的主要干扰因素。介绍了目前ITU-T提出的几种主流的针对串音问题的解决方案,尤其重点描述了近来的研究热点——串音消除技术,并对其中的关键算法进行了归纳和分析-And the loop bandwidth increases with decreasing distance, the crosstalk (Crosstalk) VDSL2 systems have become main interference factors. ITU-T describes the current proposed several mainstream solution for the problem of crosstalk, especially the focus of a recent study described the hot- crosstalk cancellation techniques, and the key algorithm for the induction and analysis Platform: |
Size: 360448 |
Author:cao |
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Description: 传统的宽带信号中抑制正弦干扰的方法是采用陷波器(notch filter),为此需要精确知道干扰正弦的频率.然而当干扰正弦频率是缓慢变化时,且选频率特性要求十分尖锐时,则最好采用自适应噪声抵消的方法.下图是用一个二阶FIR的LMS自适应滤波器消除正弦干扰的一个方案。该代码实现了以下功能：
1) 借助MATLAB画出了滤波器的误差性能曲面和误差性能曲面的等值曲线；
2） 给出了最陡下降法以及LMS算法的计算公式；
3） 用MATLAB产生了方差为0.05, 均值为0白噪音S(n)，并画出某次采样得到的波形；
4） 根据 2）中的公式，并利用 3）中产生的S(n)，在 1）中的误差性能曲面的等值曲线上叠加画出了采用最陡下降法以及LMS法时H(n)的在叠代过程中的轨迹曲线；
5）用MATLAB计算并画出了LMS法时误差随时间n的变化曲线（对应S(n)的某一次的一次实现）和e(n)波形；
6）在 1）中的误差性能曲面的等值曲线上，叠加画出采用LMS法得到的100次实验中的H(n)的平均值的轨迹曲线；
7）最终对结果进行了分析，具体见压缩包的word文档。
-Wideband signal in the conventional sinusoidal interference suppression method is the use notch filter (notch filter), this requires precise knowledge of the frequency of a sinusoidal interference . However, when the interference frequency sinusoidal changes slowly , and the selected frequency characteristic requirements are very sharp , then best use of adaptive noise cancellation method . following figure is a second-order FIR LMS adaptive filter to eliminate a program sinusoidal interference . The code implements the following functions:
A ) draw with MATLAB error performance of the filter surface and the surface contour error performance curve
2 ) gives the steepest descent method and the LMS algorithm formula
3 ) generated using MATLAB variance of 0.05 with a mean of 0 white noise S (n), and draw a particular sampling waveform
4 ) based on 2 ) of the formula , and use 3 ) generated in S (n), in a ) the error performance curves superimposed on the surface contour pl Platform: |
Size: 313344 |
Author:邵曈 |
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Description: be助天线不同排列形式及位置变化对SLC影响
e5处理的自适应旁瓣对消系统设计与仿真
e5法旁瓣对消抗有源压制干扰分析及仿真
e5式开线旁瓣自适应相消技术研究与实现
e5于权值存储的自适应旁瓣干扰对消系统
e8信号处理机几个关键技术的设计与实现
e9应旁瓣对消在单脉冲跟踪雷达中的应用
MIMO雷达动目标检测的研究-Effects of changes in different arrangement and position be antenna for SLC
E5 process design and Simulation of adaptive sidelobe canceling system
E5 sidelobe canceller against Active Blanket Jamming Analysis and simulation
With the implementation of E5 type antenna sidelobe adaptive cancellation technology research
Adaptive sidelobe interference E5 in weight storage cancellation system
Design and Realization of the key technology of several E8 signal processor
E9 should be the sidelobe cancellation in monopulse tracking radar
Study on the detection of moving targets in MIMO radar Platform: |
Size: 6518784 |
Author:许琪 |
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Description: 设计一个2阶加权自适应噪声对消器，对经加性白高斯噪声信道干扰的正弦信号进行滤波。-Design of a second-order weighted adaptive noise cancellation, a sinusoidal signal by additive white Gaussian noise channel interference filter. Platform: |
Size: 1024 |
Author:yhr |
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Description: 旁瓣相消，仿真程序加入了干扰，以及旁瓣相消后的干扰输出，天线方向图-Sidelobe cancellation, joined the interference simulation program, and the side lobe cancellation after the interference of output, antenna pattern Platform: |
Size: 1024 |
Author:林子澄 |
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Description: In a rapidly fading environment in high data rate wireless communication systems the orthogonality of OFDM sub carrier signals destroyed and this phenomenon potentially results in Inter carrier interference (ICI).The novel contribution of the paper is that, the effects of ICI have been analyzed and solutions to ICI diminution have been presented in different frequency offset values such as 0.5,0.15 and 0.30 . The first method is a self-cancellation scheme, in which redundant data is transmitted onto adjacent subcarriers such that the ICI between adjacent sub carriers cancels out at the receiver. The other technique the Extended Kalman Filter (EKF) method statistically estimate the frequency offset and correct the offset using the estimated value at the receiver-In a rapidly fading environment in high data rate wireless communication systems the orthogonality of OFDM sub carrier signals destroyed and this phenomenon potentially results in Inter carrier interference (ICI).The novel contribution of the paper is that, the effects of ICI have been analyzed and solutions to ICI diminution have been presented in different frequency offset values such as 0.5,0.15 and 0.30 . The first method is a self-cancellation scheme, in which redundant data is transmitted onto adjacent subcarriers such that the ICI between adjacent sub carriers cancels out at the receiver. The other technique the Extended Kalman Filter (EKF) method statistically estimate the frequency offset and correct the offset using the estimated value at the receiver Platform: |
Size: 211968 |
Author:Fardeen |
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Description: At the transmitter side, NOMA employs
Superposition-Coding (SC) to send independent packets
(signals) to several receivers simultaneously, and on the
other hand, Successive-Interference-Cancellation (SIC) is
employed to separate the signals of different users. Platform: |
Size: 89088 |
Author:saravanakumar_gsk |
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Description: Non-orthogonal multiple access (NOMA) is a promising air-interface technology for its ability to support massive wireless mobile terminals. In this paper, the outage performance for
uplink NOMA systems employing the dynamic ordered successive
interference cancellation receiver is analyzed under the independent but not identically distributed (i.ni.d.) fading environment.
We theoretically reveal the general approach to derive the closedform outage probability expression for an arbitrary number of
serving users. Under the i.ni.d. fading environment, the probability
for each possible decoding order is derived respectively based on
the observation of the time-varying received power strength for
each user. Furthermore, encountering the challenge of solving the
multidimensional integration, a recursive method is proposed to
deal with the conditional outage probabilities under a certain
decoding order as a joint probability problem with the linear
constraints of the decoding order and the required data rate.
Finally, we derive the closed-form outage probability expressions.
The simulations are performed to validate the accuracy of the
theoretical results and reveal the superiority of the dynamic mode
over the fixed one. Platform: |
Size: 1434011 |
Author:dipfr@yahoo.fr |
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Description: Intelligent reflecting surface (IRS) is a promising
technology to enhance the coverage and performance of wireless
networks. We consider the application of IRS to non-orthogonal
multiple access (NOMA), where a base station transmits superposed signals to multiple users by the virtue of an IRS. The
performance of an IRS-assisted NOMA networks with imperfect
successive interference cancellation (ipSIC) and perfect successive
interference cancellation (pSIC) is investigated by invoking 1-
bit coding scheme. In particular, we derive new exact and
asymptotic expressions for both outage probability and ergodic
rate of the m-th user with ipSIC/pSIC. Based on analytical
results, the diversity order of the m-th user with pSIC is in
connection with the number of reflecting elements and channel
ordering. The high signal-to-noise radio (SNR) slope of ergodic
rate for the m-th user is obtained. The throughput and energy
efficiency of IRS-NOMA networks are discussed both in delaylimited and delay-tolerant transmission modes. Additionally, we
derive new exact expressions of outage probability and ergodic
rate for IRS-assisted orthogonal multiple access (IRS-OMA).
Numerical results are presented to substantiate our analyses and
demonstrate that: i) The outage behaviors of IRS-NOMA are
superior to that of IRS-OMA and relaying schemes; ii) The M-th
user has a larger ergodic rate than IRS-OMA and benchmarks.
However, the ergodic performance of the m-th user exceeds
relaying schemes in the low SNR regime; and iii) The IRS-assisted
NOMA networks have ability to achieve the enhanced energy
efficiency compared to conventional cooperative communications Platform: |
Size: 340469 |
Author:dipfr@yahoo.fr |
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Search - interference cancellation