Patent ID: 7233629

Claim:
A method comprising: locally generating a radio frequency training signal, wherein said training signal is generated by a training signal generator, and wherein a local oscillator signal is an input to said training signal generator; conveying in the analogue domain the radio frequency training signal to an in-phase branch of a direct conversion receiver and to a quadrature-phase branch of the direct conversion receiver; mixing, in the analogue domain, the radio frequency training signal of the in-phase branch with a first mixing signal to form a baseband in-phase component of the training signal and mixing, in the analogue domain, the radio frequency training signal of the quadrature-phase branch with a second mixing signal to form a phase shifted component of the training signal; analogue-to-digital converting the baseband in-phase component of the training signal and the baseband phase shifted component of the training signal to form a digital baseband in-phase component of the training signal and a digital baseband phase shifted component of the training signal; analysing in the digital domain, the digital baseband in-phase and phase shifted components of the training signal so as to detect an IQ-imbalance; and correcting the IQ-imbalance, based on the analysis, in the analogue domain, wherein said first mixing signal and said second mixing signal originate from said local oscillator.