Time domain parameter blind evaluation method of OFDM (Orthogonal Frequency Division Multiplexing) signals
A time-domain parameter and blind estimation technology, applied in baseband system components, multi-frequency code systems, etc., can solve problems such as unsuitable for wireless channel applications and poor estimation performance, and achieve the effect of reducing computational complexity and improving estimation performance
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[0030] The OFDM signal used in the present invention is a DVB-T OFDM signal 2K FFT mode, and the multipath channel is a GSM TU 6-path channel model.
[0031] Reference figure 1 The specific implementation steps of the present invention are as follows:
[0032] Step 1. Use the Welch method to estimate the power spectrum of the OFDM baseband oversampling signal r(i), where i=1, 2, Λ, N, and N is the intercepted data length:
[0033] 1.1) Divide the intercepted OFDM baseband oversampling signal r(i) into L segments, each with a data length of M L , The OFDM baseband oversampled signal data of the first segment can be expressed as:
[0034] r l (k′)=r(k′+(l-1)·M L ), k′=1, 2, ΛM L , L = 1, 2, Λ, L 1)
[0035] among them l means data segment variable, k′ means data symbol variable;
[0036] 1.2) Add the window function w(k′) to each segment of data to find the correction periodogram of each segment. The correction periodogram of the first segment is expressed as:
[0037] I l ( ω
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