For that the traditional frequency domain block LMS algorithm which is used for the narrowband interference suppression in Direct Sequence Spread Spectrum(DSSS)communication anti-jamming system leads to a conflict of con-vergence speed and steady stage error, a new variable step size FBLMS algorithm is proposed, it is the ratio of the remaining interference of the output signal and the overall noise signal to control the variable step size factor update, as interference is filtered, the step size factor is also reduced, making the DSSS communications jamming system to obtain better suppres-sion interference effect. Firstly, DSSS communications jamming system based on the frequency domain block LMS algo-rithm is introduced. Then the proposed variable step size FBLMS is analyzed. Finally, simulation comparison of this algo-rithm and traditional algorithm are carried out. Theory analysis and simulation results show that the VSS-FBLMS algo-rithm can effectively filter out the narrowband interference. The anti-jamming performance of VSS-FBLMS algorithm can exceed the traditional FBLMS algorithm, convergence rate and steady-state error is also superior to the traditional FBLMS algorithm.

Variable step size frequency domain block LMS algorithm

As there is a conflict about block step size between the requirements of the convergence velocity and parameters' maladjustment within FBLMS algorithm, a modified FBLMS algorithm is well presented in this paper which uses a variable block step size to solve the contradiction between convergence rate and precision The modified FBLMS algorithm is simulated in the MATLAB platform The simulation results prove that this algorithm not only has a faster convergence speed, a faster tracking speed and a smaller stationary error, but also has a better anti-jamming capability

A Modified FBLMS Algorithm Research and Performance Analysis

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A Modified FBLMS Algorithm Research and Performance Analysis