Channel estimation method and apparatus for OFDM of transmission diversity
A technology of channel estimation and transmit diversity, which is applied in the field of OFDM channel estimation, and can solve problems such as difficulty in controlling the peak-to-average power ratio of the transmit time-domain waveform, low signal-to-noise ratio, and difficulty in achieving high-precision channel estimation.
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[0039] As shown in Figure 1, the present invention provides a channel estimation method of transmit diversity OFDM, comprising the following steps:
[0040] Step 1. Process the two channels of modulated data at the transmitter to obtain valid data X in the time domain Di , (i=1, 2);
[0041] Step 1.1, performing serial-to-parallel conversion on the two-way modulated data at the transmitter in the serial-to-parallel conversion circuit;
[0042] Step 1.2, performing space-time encoding processing on the data output in step 1.1 in a space-time encoder;
[0043] Step 1.3, respectively perform N-point IFFT (inverse fast Fourier transform) operation on the two output signals output in step 1.2 to obtain time-domain effective data X D1 and x D2 ;
[0044] Step 2, the pilot data generation unit simultaneously generates the time-domain pilot data sequences required by the two transmitting antennas:
[0045] x P =[exp(j*2π*B*0*(0:1:L+K-1) / N)L exp(j*2π*B*k*(0:1:L+K-1) / N )L] 1×b ...
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Abstract
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