Blind Estimation of Symbol Rates of Multi-component Phase-Shift Keying Signals
Ningyu Yu · Journal of Southwest Jiaotong University · 2011
To solve the parameter estimation problem of multi-component phase-shift keying(PSK) signals intercepted simultaneously by a single-channel receiver in the same bandwidth,a new blind estimation algorithm was proposed.With this algorithm,blind signal separation is avoided and the symbol rate of each independent signal can be estimated directly.The linearity of the 2nd-order conjugated cyclic correlation for a multi-component PSK signal was derived theoretically,so that the symbol rate of each independent signal can be extracted without interference.In addition,a simple and effective method was proposed to enhance spectrum peaks.Compared with spectrum peaks obtained based on the 2nd-order conjugated cyclic correlation,spectrum peaks obtained by the proposed method are legible.The simulation results indicate that with the proposed algorithm the correct probability of symbol rates can reach 98% when the power ratio of a two-component signal is 1 to 1 and the signal-to-noise ratio(SNR) is-5 dB.Especially in a single-component signal case,the proposed algorithm can bring more than 4 dB performance improvement compared with the existing algorithm.