  In a target communication system, a delicately designed frequency offset
estimation scheme is required to meet certain decoding performance. In this
paper, we proposed at wo-step estimation scheme, coarse and residual, with
different value of an time interval parameter. A result of RF conduction test
shows that the proposed method has an 1dB gain of SNR compared to coarse-only
estimator. A result of the commercial test also indicates the proposed method
outperforms coarse-only estimator especially in low SNR condition.
