Blind Maximum-Likelihood Timing Recovery in the Presence of Carrier Frequency Offset

With the introduction of the Modified Matched Filter method, we first present a novel blind maximum-likelihood timing recovery approach for the all-digital receivers suffering from carrier frequency offset. Then a suboptimum version, equivalent to the Gardner timing recovery loop employing the matched filter instead and independent of the frequency offset estimation, is derived to reduce the computational complexity. Moreover, a Mismatch criterion is introduced for the suboptimum simplification to provide the carrier-frequency-offset range in which it suffers negligible steady-state performance degradation and facilitate the system design. The effectiveness of these two methods as well as the validity of the Mismatch criterion are demonstrated through simulations.