Patent ID: 7310388
Filing Date: 2007-12-18
Classification: H03D

Abstract:
1. A receiving method in a direct conversion receiver, the method comprising: receiving a signal comprising multiple components at different receiving frequencies belonging to a frequency band; mixing at least one of the received signal components into a corresponding base band signal comprising I- and Q branches; converting the analog base band signal into a digital signal; measuring power levels of the signal components in the digital signal in pairs, where a first component in a pair belongs to an upper sideband of the frequency band and a second component in the pair belongs to a lower sideband of the frequency band; estimating, when either the upper sideband component or the lower sideband component dominates in power over another component in the pair, a frequency-independent phase imbalance, a frequency-dependent phase imbalance and a gain imbalance; compensating the estimated frequency-independent phase imbalance, the frequency-dependent phase imbalance and the gain imbalance to at least one of the I- and Q-branch signals wherein the estimating further comprises