Phase noise inhibition method based on continuous carrier aggregation
A phase noise, continuous carrier technology, applied in the baseband system, baseband system components, shaping network in the transmitter/receiver, etc., to achieve the effect of suppressing CPE and ICI, and suppressing phase noise
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[0049] In the continuous carrier aggregation system, N=1024 subcarriers are transmitted, and the transmitted frequency domain signal is obtained by performing 16-orthogonal amplitude modulation on it:
[0050] X=[X(0) X(1) ... X(1023)] T
[0051] The phase noise φ(n) on the nth subcarrier is modeled using the Power Spectral Density (PDS) estimation method:
[0052]
[0053] It can be obtained by measuring a real tuner with a phase-locked loop (PLL), setting the model parameters as a=6.5, b=4, f 1 = 1KHz and f 2 =10KHz, the sampling frequency of the system is 40MHz, and the Gaussian noise sequence is used to generate a phase noise signal through a low-pass filter:
[0054] φ=[φ(0) φ(1) … φ(1023)] T .
[0055] The cyclic prefix length N g Set to 32, assuming that the transmitted signal propagates through a multipath fading channel, the number of multipath channels is M=4, and the time domain channel is modeled by pulse delay:
[0056]
[0057] where α m is the attenu...
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