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How to estimate the SNR of a SDR (Software-Defined Radio) receiver system is discussed in this paper. Firstly, a basic estimating SNR method for a SDR receiver is presented by utilizing some existed theories. Secondly, the SNR effect from clock timing jitter to a SDR receiver is discussed, and the equations to calculate the clock timing jitter from clock phase noise is derived. Then, a new correct method is proposed for estimating the SNR of a SDR receiver. Finally, experiment result shows that the new method is more accuracy.
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