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Description: WLAN仿真－发送机
wlan No Comments
设置完系统参数后，开始产生发送数据。
1. 产生随机的发送bit（tx_bits），这里不考虑信道编码。
2. QAM映射
3. 将数据映射到不同载波，形成OFDM符号
4. 产生pilot，并将pilot插入OFDM符号中
5. 加入dc和guard子载波
6. 进行ifft，将频域信号变到时域，并加入循环前缀
7. 对信号进行overlap window
8. 在时域产生short preamble
9. 在时域产生long preamble
10. 将preamble和数据符号组成packet
11. 升采样
得到信道传输的数据Tx_signal_up
具体程序见附件 wlan_transmitter.m-WLAN Simulation- wlan No Comments transmitter system parameters set finished, the beginning to have to send data. 1. Have sent random bit (tx_bits), here does not consider channel coding. 2. QAM mapping 3. The data is mapped to a different carrier to form OFDM symbols 4. Have a pilot, and pilot inserted OFDM symbols 5. Adding dc and guard subcarriers 6. To carry out ifft, will change the frequency domain signal to time domain, and add cyclic prefix 7. the signals overlap window8. In the time domain have a short preamble9. In the time domain have a long preamble10. the preamble and data symbols packet11. or sampling received data transmission channel Tx_signal_up specific procedures see Annex wlan_transmitter.m
Platform: |
Size: 1024 |
Author: 福东方 |
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Description: Phase noise resulting in Common Phase Error
(CPE) and Inter-Carrier Interference (ICI) is a critical challenge
to the implementation of OFDM systems. Modeling phase noise
as a stationary Gaussian random process with the specified
power spectrum density, different from conventional approaches
which mostly relay on pilots to provide CPE estimation, we
explore the statistical characteristics of the sufficient statistics
then propose a pilot-aided decision-directed approach according
to maximum-likelihood criterion. Numerical results demonstrate
that the proposed algorithm enjoys 2dB gain at moderate SNR
and is quite robust against possible model mismatch
Platform: |
Size: 148480 |
Author: xiaobo |
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Description: Phase noise resulting in Common Phase Error
(CPE) and Inter-Carrier Interference (ICI) is a critical challenge
to the implementation of OFDM systems. Modeling phase noise
as a stationary Gaussian random process with the specified
power spectrum density, different from conventional approaches
which mostly relay on pilots to provide CPE estimation, we
explore the statistical characteristics of the sufficient statistics
then propose a pilot-aided decision-directed approach according
to maximum-likelihood criterion. Numerical results demonstrate
that the proposed algorithm enjoys 2dB gain at
Platform: |
Size: 84992 |
Author: xiaobo |
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Description: Phase noise resulting in Common Phase Error
(CPE) and Inter-Carrier Interference (ICI) is a critical challenge
to the implementation of OFDM systems. Modeling phase noise
as a stationary Gaussian random process with the specified
power spectrum density, different from conventional approaches
which mostly relay on pilots to provide CPE estimation, we
explore the statistical characteristics of the sufficient statistics
then propose a pilot-aided decision-directed approach according
to maximum-likelihood criterion. Numerical results demonstrate
that the proposed algorithm enjoys 2dB gain at moderate SNR
and is quite robust against possible model mismatch
Platform: |
Size: 6144 |
Author: xiaobo |
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Description: Pilot Carrier Design in OFDM Syastem
Platform: |
Size: 2048 |
Author: kalapraveen |
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Description: In this paper, we investigate the timing and carrier
frequency offset (CFO) synchronization problem in decode and
forward cooperative systems operating over frequency selective
channels. A training sequence which consists of one orthogonal
frequency-division multiplexing (OFDM) block having a tile
structure in the frequency domain is proposed to perform synchronization.
Timing offsets are estimated using correlation-type
algorithms. By inserting some null subcarriers in the proposed tile
structure, we propose a computationally efficient subspace decomposition-
based algorithm for CFO estimation. The issue of optimal
tile length is studied both theoretically and through simulations.
By judiciously designing the tile size of the pilot, the proposed
algorithms are shown to have better performance, in terms of
synchronization errors and bit error rate, than the time-division
multiplexing-based training method and the computationally demanding
space-alternating generalized expectation-maximization
Platform: |
Size: 985088 |
Author: ashish |
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Description: In this paper, we investigate the timing and carrier
frequency offset (CFO) synchronization problem in decode and
forward cooperative systems operating over frequency selective
channels. A training sequence which consists of one orthogonal
frequency-division multiplexing (OFDM) block having a tile
structure in the frequency domain is proposed to perform synchronization.
Timing offsets are estimated using correlation-type
algorithms. By inserting some null subcarriers in the proposed tile
structure, we propose a computationally efficient subspace decomposition-
based algorithm for CFO estimation. The issue of optimal
tile length is studied both theoretically and through simulations.
By judiciously designing the tile size of the pilot, the proposed
algorithms are shown to have better performance, in terms of
synchronization errors and bit error rate, than the time-division
multiplexing-based training method and the computationally demanding
space-alternating generalized expectation-maximization
Platform: |
Size: 728064 |
Author: ashish |
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Description: 多天线正交频分复用(MIMO-OFDM,Multiple-Input and Multiple-Output Orthogonal Frequency Division Multiplex)系统中,精确的符号定时同步可使接收端解调数据时消除载波频率偏移和符号间干扰。而由于MIMO空间信道复杂度较高,使得单天线OFDM系统的同步方法不能直接应用于MIMO-OFDM系统中。提出的两步同步方法首先利用时域导频作为第一步同步进行粗同步,然后利用循环交织前缀作为第二步同步对每一个MIMO-OFDM符号进行同步偏差调整。需要指出的是,两次同步过程均可以产生尖锐的相关峰,使得同步精度大为提高。-Accurate timing synchronization of symbol is important for MIMO-OFDM system,and it can eliminate the integral frequency shift of carrier and intersymbol interference.Two-step timing synchronization method is proposed in this thesis.First,the time-domain pilot is employed to obtain coarse timing synchronization,then the interleaved cyclic prefix and maximum likelihood estimation method are adopted to adjust the synchronization difference,through which the correlational characteristic of that window could be ...
Platform: |
Size: 807936 |
Author: 王睿 |
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Description: 本程序仿真CDMA2000的复扩频过程,只考虑导频信道和一个业务信道,假设同步已建立，接收端能产生同频同相相干载波,整个仿真过程在基带中进行.-The simulation program CDMA2000 complex spread spectrum, considering only the pilot channel and a business channel, and assume that synchronization has been established, the receiver can produce the same frequency and phase coherent carrier, the whole simulation process in the baseband
Platform: |
Size: 3072 |
Author: 小怪 |
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Description: 对OFDM进行 基于导频序列的同步的仿真，帧同步，符号同步及载波同步-OFDM based on pilot sequence simulation synchronization, frame synchronization, symbol synchronization and carrier synchronization
Platform: |
Size: 27648 |
Author: fangyangyang |
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Description: 导频插入，此程序用ISE的verilog编写，主要用于载波提取和采样频率同步-Pilot insertion procedures prepared by the ISE verilog, mainly used for carrier extraction and sampling frequency synchronization
Platform: |
Size: 161792 |
Author: 牧童 |
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Description: 一种新的符号定时和载波频率同步算法,该算法将OFDM符号分成几部分。它使用相关性和积累在几个OFDM同步算法对OFDM系统基于试点,使用前言快速、准确获取信号,在有限的时间建立同步,利用导频跟踪同步信息-A new symbol timing and carrier frequency synchronization algorithm is presented and the algorithm divides the OFDM symbol into several parts. It uses correlation and accumulation in several OFDM a synchronization algorithms for OFDM system based on pilot, using the preamble to fast and accurate acquire signal, establish synchronization in the limited time, and using pilot to track synchronization information
Platform: |
Size: 1267712 |
Author: wujueying |
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Description: 在导频放置Multicarrier-Based系统,关于信道估计方法-On the Pilot Carrier Placement in Multicarrier-Based Systems
Platform: |
Size: 1709056 |
Author: yanghui |
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Description: 低压电力线载波通信的OFDM系统仿真，采用了压缩感知的方法进行信道估计，分别选取不同导频数目与LS算法比较，仿真效果良好。-OFDM power line carrier communication system simulation, using the compressed sensing method for channel estimation, respectively, to select a different number of pilot and LS algorithm, the simulation results is good.
Platform: |
Size: 3072 |
Author: Yufei Zhao |
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Description: 应用于低压电力线载波通信的OFDM系统仿真，采用了压缩感知的方法进行信道估计，采用不同的导频分布方式，仿真效果良好。-Used in low-voltage power line carrier communication OFDM system simulation, using the compressed sensing method for channel estimation, using different distribution methods pilot simulation to good effect.
Platform: |
Size: 3072 |
Author: Yufei Zhao |
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Description: 快衰落瑞利信道下一种适合单载波传输的导频符号的设计-A Pilot Design Technique for Single-Carrier
Transmission over Fast Fading Relay Channels
Platform: |
Size: 201728 |
Author: xuezhen |
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Description: Application of spread spectrum for satellite land mobile systems is difficult in satellite link because of synchronization and
providing code or considerable Doppler shift. This is particularly high for LEO satellites. So that, a Doppler shift carrying a
frequency in band S can reach to several tens of kHz. To estimate and compensate Doppler, a CW pilot carrier is used. The
aim of this study is simulate Doppler frequency estimation using MIMO-OFDM technique. Finally, the proposed algorithm is
compared to MMSE algorithm in order to insure its performance.
Platform: |
Size: 136192 |
Author: Neo Matrix |
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Description: This paper depicts the development of Orthogonal
Frequency Division Multiplexing a historical perspective.
A summary of major research milestones are noted that
contributed to modern-day OFDM. These contributions
include the use of discrete Fourier transforms replacing the
analog implementation and addition of cyclic extensions to
ensure orthogonality among the sub-channels. Also, channel
equalization algorithms to suppress inter-symbol interference
and inter-carrier interference, channel estimation through the
insertion of pilot tones among data blocks, peak-to-average
power ratio reduction, and synchronization techniques.-This paper depicts the development of Orthogonal
Frequency Division Multiplexing a historical perspective.
A summary of major research milestones are noted that
contributed to modern-day OFDM. These contributions
include the use of discrete Fourier transforms replacing the
analog implementation and addition of cyclic extensions to
ensure orthogonality among the sub-channels. Also, channel
equalization algorithms to suppress inter-symbol interference
and inter-carrier interference, channel estimation through the
insertion of pilot tones among data blocks, peak-to-average
power ratio reduction, and synchronization techniques.
Platform: |
Size: 3472384 |
Author: Donna Loudoe |
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