A Digital Backend Architecture for Fourier Imaging
A Digital Backend Architecture for Fourier Imaging
A Digital Backend Architecture for Fourier Imaging
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A real-sampled biplex FFT, with output demuxed by 2<br />
16<br />
in_0-3<br />
in_8-11<br />
in_4-7<br />
in_12-15<br />
in_16-19<br />
in_24-27<br />
in_20-23<br />
in_28-31<br />
Antenna n<br />
….................…………………………………………………..………….… .………………………………………………..……….…<br />
Antenna n+1<br />
Ch0 Ch1 Ch M-1 Ch M Ch0 Ch1<br />
Ch0 Ch1 Ch M-1 Ch M Ch0 Ch1<br />
Ch0 Ch1 Ch M-1 Ch M Ch0 Ch1<br />
Ch0 Ch1 Ch M-1 Ch M Ch0 Ch1<br />
2048 clock cycles <strong>for</strong> each antenna<br />
8192 clock cycles needed<br />
Ch0 Ch1 Ch M-1 Ch M Ch0 Ch1<br />
Ch0 Ch1 Ch M-1 Ch M Ch0 Ch1<br />
Ch0 Ch1 Ch M-1 Ch M Ch0 Ch1<br />
Ch0 Ch1 Ch M-1 Ch M Ch0 Ch1<br />
Antenna n Antenna n+1<br />
Ch0 Ch1 Ch M − 1 Ch M Ch0 Ch1<br />
2 2<br />
out_0_4_1_5_2_6_3_7<br />
…………………….............…<br />
Ch0 Ch1 Ch M − 1 Ch M Ch0 Ch1<br />
2 2<br />
Complex data<br />
re[18.17], im[18.17]<br />
out_8_12_9_13_10_14_11_15<br />
1024 clock cycles <strong>for</strong> each antenna<br />
8192 clock cycles needed<br />
…………………….............…<br />
Ch0 Ch1 Ch M − 1 Ch M Ch0 Ch1<br />
2 2<br />
Ch0 Ch1 Ch M − 1 Ch M Ch0 Ch1<br />
2 2<br />
out_16_20_17_21_18_22_19_23<br />
Complex data<br />
re[18.17], im[18.17]<br />
out_24_28_25_29_26_30_27_31<br />
F engine<br />
n_fft = 11<br />
M = 2 n_fft - 1
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