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[matlabhighpowerOfdm

Description: OFDM高功率放大器.供学习matlab的同学交流学习 -The Matlab code investigates the harmful effects of high power amplifier on ofdm signals. It is imagined that the amplifier destroy the amplitude of the transmitted signal due to saturation and has no effect on the signal phase. The model is acceptable for solid state amplifier to some extend.
Platform: | Size: 2048 | Author: 天天 | Hits:

[matlabMusysid

Description: I need estimation channel MIMO-OFDM because I do synchronous CFO and SFO by tracking algorithm Obelix-I need estimation channel MIMO-OFDM because I do synchronous CFO and SFO by tracking algorithm Obelix
Platform: | Size: 10240 | Author: bachka | Hits:

[Program docsimp_CFOest_mimoofdm

Description: simple CFO estimation in mimo ofdm
Platform: | Size: 1024 | Author: murali | Hits:

[matlabgetPDF1

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 | Hits:

[matlabgetPDF2

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 | Hits:

[matlabOFDM-CFO

Description: 基于OFDM信道冲击响应和信道估计的matlaB仿真代码。值得借鉴!-Based on OFDM channel impulse response and channel estimation matlaB simulation code. Worth learning!
Platform: | Size: 1024 | Author: 刘高星 | Hits:

[Communication-MobileMIMO-OFDM-Systems-Based-on-Preamble-

Description: MIMO􀀁 OFDM 技术将成为第4 代移动通信系统的关键技术, 因MIMO􀀁 OFDM 对时间和频率偏移非常敏感, 因此MIMO􀀁 OFDM 同步显得尤为重要。提出了一种新的MIMO􀀁 OFDM 定时同步和频偏同步技术。以GCL 序列为基础设 计了一个新的符合MIMO􀀁 OFDM 同步技术的导频序列, 通过对该导频序列进行2 次相关得到频率估计, 并将所得频率 运用到定时同步中, 得到更为准确的时间估计。仿真结果表明, 在相同的信噪比情况下, 该方法可以使得系统的误码 率和帧传送误码率相对传统方法得到进一步减小。-MIMO􀀁 OFDM will become a key technology of the fourth generation mobile communications system. However, MIMO􀀁 OFDM is sensitive to the CFO and timing synchronization, so the MIMO􀀁 OFDM synchronization technology is very important. This paper proposes an accurate technique for timing and frequency synchronization of multiple􀀁 input multiple􀀁 output ( MIMO ) orthogonal frequency division multiplexing ( OFDM) systems. The technique derives a new preamble signal based on GCL sequences, according with the MIMJO􀀁 OFDM synchronization. The carrier frequency offset ( CFO) estimation is obtained through taking double correlation operations on the preamble signal, and used in the timing synchronization to gain accurate time estimation. The simulation results show that at the same SNR, the proposed method can reduce the BER and the frame transmission BER of the system compared to the conventional method.
Platform: | Size: 408576 | Author: 蜡笔 | Hits:

[matlabBlind-Frequency-Syn

Description: 一种关于MIMO-OFDM系统盲频率同步的资料文档,用MATLAB进行仿真分析-A novel blind carrier frequency offset (CFO) estimation algorithm was proposed which is based on estimating signal parameter via rotational invariance techniques (ESPRIT) for multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) systems with virtual carriers.
Platform: | Size: 402432 | Author: 李真 | Hits:

[Communication-Mobilefwdmalawmc

Description: Abstract—In this paper, we study the joint estimation of inphase and quadrature-phase (I/Q) imbalance, carrier frequency offset (CFO), and channel response for multiple-input multipleoutput (MIMO) orthogonal frequency division multiplexing (OFDM) systems using training sequences. A new concept called channel residual energy (CRE) is introduced. We show that by minimizing the CRE, we can jointly estimate the I/Q imbalance and CFO without knowing the channel response. The proposed method needs only one OFDM block for training and the training symbols can be arbitrary. Moreover when the training block consists of two repeated sequences, a low complexity two-step approach is proposed to solve the joint estimation problem. Simulation results show that the mean-squared error (MSE) of the proposed method is close to the Cramer-Rao bound (CRB). Index Terms—MIMO OFDM, CFO, I/Q imbalance, channel estimation.
Platform: | Size: 551936 | Author: santhu | Hits:

[Communication-Mobilematlabcodeandbasepaper

Description: Abstract—In this paper, we study the joint estimation of inphase and quadrature-phase (I/Q) imbalance, carrier frequency offset (CFO), and channel response for multiple-input multipleoutput (MIMO) orthogonal frequency division multiplexing (OFDM) systems using training sequences. A new concept called channel residual energy (CRE) is introduced. We show that by minimizing the CRE, we can jointly estimate the I/Q imbalance and CFO without knowing the channel response. The proposed method needs only one OFDM block for training and the training symbols can be arbitrary. Moreover when the training block consists of two repeated sequences, a low complexity two-step approach is proposed to solve the joint estimation problem. Simulation results show that the mean-squared error (MSE) of the proposed method is close to the Cramer-Rao bound (CRB). Index Terms—MIMO OFDM, CFO, I/Q imbalance, channel estimation.
Platform: | Size: 277504 | Author: santhu | Hits:

[Program docTime-Frequency-Multiplex-Preamble-Design-CFO-in-O

Description: Time Frequency Multiplex Preamble Design for Joint I1Q Imbalance, CFO and Channel Estimation in OFDM Systems IEEE Paper
Platform: | Size: 1665024 | Author: RITEN PATEL | Hits:

[Othermod16qam

Description: Multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) is very sensitive to the carrier frequency offset (CFO), which not only affects the channel estimation but also the selection of a minimum error probability based precoder for peak-to-average power ratio (PAPR) reduction such that the system performance will degrade. This paper presents the joint scheme of CFO) and channel estimation in the MIMO-OFDM systems with the minimum error probability based precoder for reducing PAPR. We provide the solution to eliminate the effects of ICI due to CFO mismatch for OFDM with space frequency block codes and spatial multiplexing, drive a generalized linear model and propose a non-iterative reduced complexity model. Our proposed scheme is effective in estimating and compensating for frequency-independent and frequency dependent transmit and receive ICI in the presence of a carrier frequency offset.-Multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) is very sensitive to the carrier frequency offset (CFO), which not only affects the channel estimation but also the selection of a minimum error probability based precoder for peak-to-average power ratio (PAPR) reduction such that the system performance will degrade. This paper presents the joint scheme of CFO) and channel estimation in the MIMO-OFDM systems with the minimum error probability based precoder for reducing PAPR. We provide the solution to eliminate the effects of ICI due to CFO mismatch for OFDM with space frequency block codes and spatial multiplexing, drive a generalized linear model and propose a non-iterative reduced complexity model. Our proposed scheme is effective in estimating and compensating for frequency-independent and frequency dependent transmit and receive ICI in the presence of a carrier frequency offset.
Platform: | Size: 1942528 | Author: sivadeep | Hits:

[matlabfinal-review

Description: Multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) is very sensitive to the carrier frequency offset (CFO), which not only affects the channel estimation but also the selection of a minimum error probability based precoder for peak-to-average power ratio (PAPR) reduction such that the system performance will degrade. This paper presents the joint scheme of CFO) and channel estimation in the MIMO-OFDM systems with the minimum error probability based precoder for reducing PAPR. We provide the solution to eliminate the effects of ICI due to CFO mismatch for OFDM with space frequency block codes and spatial multiplexing, drive a generalized linear model and propose a non-iterative reduced complexity model.-Multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) is very sensitive to the carrier frequency offset (CFO), which not only affects the channel estimation but also the selection of a minimum error probability based precoder for peak-to-average power ratio (PAPR) reduction such that the system performance will degrade. This paper presents the joint scheme of CFO) and channel estimation in the MIMO-OFDM systems with the minimum error probability based precoder for reducing PAPR. We provide the solution to eliminate the effects of ICI due to CFO mismatch for OFDM with space frequency block codes and spatial multiplexing, drive a generalized linear model and propose a non-iterative reduced complexity model.
Platform: | Size: 1024 | Author: sivadeep | Hits:

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