发明名称 |
Method and apparatus for estimating the current signal-to-noise ratio |
摘要 |
A method of estimating current SNR in a sequence of symbols, including receiving a signal representing an additive mixture y(t)=s(t)+n(t) of a sequence of phase-modulated symbols with fixed length and phase modulation s(t) and including white Gaussian noise (AWGN) n(t); separating quadrature components IY and QY of the received signal in a quadrature mixer; determining a mean-square IY2 of IY; determining a mean-square QY2 of QY; determining a square/squared value of mean absolute value (modulus) |IY|2; determining a square of mean value for quadrature component ]QY[2, where values of the quadrature component QY are averaged taking into account a sign of a symbol received in a channel; determining a current absolute value (vector length) for Iy2+Qy2; determining the current SNR based on IY2, QY2, |IY|2, ]QY[2 and √{square root over (Iy2+Qy2)}; and compensating for a systematic error of the current SNR. |
申请公布号 |
US9425908(B1) |
申请公布日期 |
2016.08.23 |
申请号 |
US201514865240 |
申请日期 |
2015.09.25 |
申请人 |
Topcon Positioning Systems, Inc. |
发明人 |
Vazhenin Nikolay Afanasievich;Veitsel Andrey Vladimirovich;Serkin Fedor Borisovich;Veitsel Vladimir Victorovich |
分类号 |
H04B17/336 |
主分类号 |
H04B17/336 |
代理机构 |
Bardmesser Law Group |
代理人 |
Bardmesser Law Group |
主权项 |
1. A method of estimating a current signal-to-noise ratio (SNR) in a sequence of symbols, the method comprising:
receiving a signal representing an additive mixture y(t)=s(t)+n(t) of a sequence of phase-modulated symbols with fixed length and phase modulation s(t) and including white Gaussian noise (AWGN) n(t); separating quadrature components IY and QY of the received signal in a quadrature mixer; determining a mean-square IY2 of IY; determining a mean-square QY2 of QY; determining a square/squared value of mean absolute value (modulus) |IY|2; determining a square of mean value for quadrature component ]QY[2, where values of the quadrature component QY are averaged taking into account a sign of a symbol received in a channel; determining a current absolute value (vector length) for √{square root over (Iy2+Qy2)}; determining the current SNR based on a combination or some of {IY2, Qy2}, {|IY|2,]QY[2} and/or √{square root over (Iy2+Qy2)}; and compensating for a systematic error of the current SNR. |
地址 |
Livermore CA US |