چکیده:
This paper proposes an new iterative method to recover the signals corrupted by impulsive noise in MIMO-OFDM systems over In-home PLC. In this iterative technique, preliminary decisions are made to get the impulsive noise detection algorithm for finding the locations and amplitudes of the impulses, and then signal estimation block for approximation the signals for two-branch 2*2 MIMO-OFDM at the receiver. In each iteration, this signals approximation are used to improve the noise estimate. After impulsive noise detection, an comparison - decision algorithm is employed to compare two noises estimated, and decision for cancel impulsive noise and improve Mitigation of the impulsive noise algorithm. This method use an adaptive threshold and soft decision to estimating and canceling the impulsive noises. Then, by using ML detection, an approximation of signal is obtained. As this impulsive noise detection , comparison - decision and ML detection loop continues, we get better approximates of the signal. The algorithm is analyzed and verified by computer simulations. A comparison between the performance of the different systems is presented and discussed. The Simulation results confirm the robustness of performance of the proposed algorithm.
خلاصه ماشینی:
ir ABSTRACT This paper proposes an new iterative method to recover the signals corrupted by impulsive noise in MIMO-OFDM systems over In-home PLC.
In this iterative technique, preliminary decisions are made to get the impulsive noise detection algorithm for finding the locations and amplitudes of the impulses, and then signal estimation block for approximation the signals for two-branch 2*2 MIMO-OFDM at the receiver.
OFDM(Orthogonal Frequency Division Multiplexing) modulation schemes is a promising technique being used for bandwidth efficient communication over the PLC, Full capacity of the channel, high-speed data services broadband, Reduce the complexity equalization, its capacity to minimize ISI, and powerful in impulsive noise environments.
In this paper, we discuss mitigation of Effect of Impulsive Noise from a signal for MIMO (2*2) channel by Alamouti scheme in OFDM-based systems over In-home Power Line Channels.
3. THE PROPOSED METHOD The symbols are received of 2*2 MIMO-PLC by Alamouti scheme in OFDM-based systems over In-home Power Line Channels.
Channel capacity / of the MIMO-PLC channel can be described as [31]: Figure 12 shows a comparison of the BER performance between the new iterative method and the conventional method in the in-home MIMO-OFDM systems for impulsive noise and Gaussian noise.
Figure 10 presents a comparison of the BER of the MIMO-OFDM in- home PLC system when the impulsive noise index A is varied(with /).
5. CONCLUSION In this paper, we proposed an Impulsive Noise Estimation and Suppression in OFDM-MIMO Systems over In-home Power Line Channels.
Performance Analysis of OFDM Systems for Broadband Power Line Communications Under Impulsive Noise and Multipath Effects.