Patent ID: 8634496

Claim:
A method of determining non-ideality characteristics introduced on a radio frequency (RF) modulated signal transmitted from a transmitter via a transmission channel to a receiver, the method comprising: generating a preamble comprising multiple sets of known training sequences with a synchronization part for synchronization preceding an estimation part for estimating non-ideality characteristics, the training sequences in the estimation part comprising at least two sequences which are (i) complementary Golay sequence pairs and (ii) selected to satisfy a predetermined correlation relationship chosen for estimation of a plurality of non-ideality characteristics including estimating an IQ imbalance ratio of the transmitter and the receiver, wherein the predetermined correlation relationship comprises the following properties: i) a second sequence equals minus a complex conjugate of a first sequence; ii) a first selection of periodic correlations of the complex conjugate of a sequence with the sequence equals zero; iii) a zero shift correlation of the complex conjugate of a sequence with the sequence equals a length of the sequence N; and iv) a second selection of periodic correlations of a sequence with the sequence equals zero; transmitting the preamble from the transmitter via the transmission channel to the receiver; determining a first estimate of a first non-ideality characteristic based at least in part on the known training sequences of the synchronization part of the received preamble; compensating the estimation part of the received preamble using the first estimate of the first non-ideality characteristic; and determining an estimate of a second non-ideality characteristic different from the first non-ideality characteristic based at least in part on the compensated estimation part by exploiting the predetermined correlation relationship.