Apparatus and method of compensating for I/Q imbalance in direct up-conversion system

摘要

An apparatus and a method of compensating for an I/Q imbalance in a direct up-conversion system prevents the performance of the system from being deteriorated by efficiently compensating for an I/Q timing skew, an I/Q phase imbalance, and an I/Q gain imbalance by using a characteristic of an OFDM scheme in an Orthogonal Frequency Domain Multiple (Access) (OFDM(A)) system using a direct up-conversion scheme. According to the apparatus and the method of compensating for an I/Q imbalance in the direct up-conversion system of the present invention, an OFDM(A) system using a direct up-conversion scheme may efficiently compensate for I/Q timing skew, I/Q phase imbalance, and I/Q gain imbalance by using a characteristic of an OFDMA scheme, so that a performance of the system is prevented from being deteriorated.

主权项

1. An In-phase/Quadrature-phase (I/Q) imbalance compensation apparatus in a direct up-conversion system, the I/Q imbalance compensation apparatus comprising:
a pre-distortion factor calculator for fetching pre-measured I/Q imbalance factors and calculating pre-distortion factor A, B, C and D; and a pre-distortion executer for executing a pre-distortion for each subcarrier through the distortion factors A, B, C and D corresponding to each subcarrier, wherein the pre-distortion factors A, B, C and D are calculated by the following equations,⁢Phasetiming⁢⁢_⁢⁢skew=2*π*(subcarrier⁢⁢index-(N2-1))*Δ⁢⁢f*τ⁢N2≤subcarrier⁢⁢index