OFDM signal I/Q imbalance estimation computer program procedure uses iterative solution of system of partial differential equations from log likelihood cost function

摘要

An OFDM (Orthogonal Frequency Division Multiplexed) signal (1) I/Q imbalance (5) estimation computer program procedure builds a log likelihood cost function depending on the transmission channel (9) response (10) at sub carrier frequencies (2) and signal quality function, DQ, uses partial differentiation with respect to channel response, DQ and the I/Q imbalance to create and iteratively solve a system of non linear simultaneous partial differential equations to find the minimum cost.