| 摘要 |
A receiver (100) has an ln-phase path (l-path) (101) that delivers a digital l-path signal x1(t) and a Quadrature path (Q-path) (103) that delivers a digital Q-path signal xQ(t). The receiver (100) includes a compensation stage (124) arranged to compensate for gain error g and phase error φ between the digital l-path signal x1(t) and the digital Q-path signal xQ(t). The compensation stage (124) has a compensation coefficient generation stage (200), a compensation coefficient application stage (202), a gain control stage (208), a relative gradient generation stage (214) and a step parameter generation stage (224). Compensation coefficients W1,1, W1,2, W2,1, W2,2 applied to the digital l-path signal x1(t) and the digital Q-path signal xQ(t) are generated by iteratively updating them using a relative gradient of the compensated digital in-phase signal y1(t) and a compensated digital quadrature signal yQ(t), and a step parameter μn, the magnitude of which is adjusted based on a rate of change of the compensation coefficients W1,1, W1,2, W2,1, W2,2. |
| 主权项 |
1. A receiver for receiving a signal, the receiver comprising:
a local oscillator arranged to deliver an in-phase local oscillator signal and a quadrature local oscillator signal; an in-phase signal path having a mixer arranged to mix the signal received by the receiver with the in-phase local oscillator signal to deliver an in-phase signal, and an analogue-to-digital converter arranged to convert the in-phase signal to a digital in-phase signal; and a quadrature signal path having a mixer arranged to mix the signal received by the receiver with the quadrature local oscillator signal to deliver a quadrature signal, and an analogue-to-digital converter arranged to convert the quadrature signal to a digital quadrature signal; a compensation stage arranged to deliver a compensated digital in-phase signal and a compensated digital quadrature signal by applying compensation coefficients to the digital in-phase signal and the digital quadrature signal; and a compensation coefficient generator arranged to generate the compensation coefficients by iteratively updating them using a relative gradient of the compensated digital in-phase signal and the compensated digital quadrature signal, and a step parameter, wherein the compensation stage is arranged to adjust a magnitude of the step parameter based on the relative gradient of the compensated digital in-phase signal and the compensated digital quadrature signal and a rate of change of the compensation coefficients. |
