Timing Error Estimation Method Based on Preamble

Abstract

The invention discloses a timing error estimation method based on a leader sequence. The timing error estimation method based on the leader sequence comprises the steps of: (1), setting the decimation factor of a matched decimation filter to M=N-1; (2), for the output result of the matched decimation filter, performing sliding correlation operation of a known leader sequence; (3), judging output of the sliding correlation operation by a peak threshold detector, and marking the peak position; (4), setting the Fourier transform window length to the time length covering four Tsymbols by taking the marked peak position as the centre point, and, for the output value of the sliding correlation operation in the window length, performing Fourier butterfly transform; (5), for the output result of Fourier butterfly transform, performing frequency-domain phase operation; and (6), performing mapping output of the frequency-domain phase operation, and outputting a timing error estimation value. By means of the timing error estimation method based on the leader sequence disclosed by the invention, timing synchronous-adjustment stepping can be rapidly converged in an effective range.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to wireless communication equipment for aerospace vehicles, and is a method for realizing timing error estimation based on preamble sequences in a single carrier system. Background technique [0002] With the rapid growth of communication traffic, higher requirements are put forward for the transmission rate of the wireless communication system. With the improvement of the transmission rate, various high-order modulation methods are applied. However, the limitation of the high-order modulation and demodulation threshold causes the system to compensate for the energy loss by various physical means, such as increasing the transmission power to improve the signal of the receiver. The noise ratio achieves the best reception, and its derivatives have more stringent requirements on the power amplifier. At the same time, because the amplitude envelope of the high-order modulation is n...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preamble-based timing error estimation method to solve the problem that traditional timing error estimation cannot characterize the step range of timing synchronization adjustment and the normalized offset of timing error based on the system sampling rate , so that the timing synchronization adjustment step can quickly converge in the effective range

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