PhaseNoise EQ 2440 263 2014 Per Zetterberg IQ

Phase-Noise EQ 2440 26/3 -2014 Per Zetterberg

I&Q Modulator x x +

I&Q Demodulator BP x LP

With phase-noise With noise or interference Can leak into desired signal, when LO 1 is non-ideal. SDR: Flexibility in digital => lots of E(f)

Time-Domain Phase-noise Modulated signal (partially known, e. g. training) Phase-noise spectrum: or Don’t be to sure of which is refered to. .

PLL Ref Phase Detector Loopfilter VCO Out Noises: VCO: 1, 1/f^2, 1/f^3 1/N : 1, 1/f Phase detector: 1, 1/f Ref input:

Model PLL Dynamics And Phase. Noise Performance Phase Detector Loopfilter VCO

Phase-Noise Spectrum ADF 4360 (RFX 1800)

OFDM Subcarrier information symbols e. g. QPSK={1, +1, -j, +1} Cyclic prefix typically Symbol time 10% without CP. Phase-noise cause inter-carrier interference.

add_phase_noise. m • Matlab function from MATLAB central. • Spectrum defined in a PSD diagram (d. Bc) is used as input. • The assumption is used. => Spectrum of is equal to spectrum of. • The real-valued noise is generated in the frequency-domain using FFT (Gaussian noise. Independent from bin to bin). • My question: How accurate is this model ? • My observation: Very neat function.

A Novel Model for Simulation of RF Oscillator Phase Noise • Paper by Siamak Yousefi potential Ph. D student at KTH. • Studies problem scetched below. • Some exact mathematical treatment and some approxmiations. • Models noise close to carrier better than Leeson. • Output of integrator unstable (my observation). Thermal and flicker noise Integrator exp(j*a)

For project course. • Use matlab function add_phase_noise. m. • Provide three basic settings. Good, fair and bad. • Present PLL with slides. Refer to ”Phase Locked Loops for High-Frequency Receivers and Transmitters Part 1 -3” and ”Model PLL Dynamics and Phase. Noise Performance”.