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There have been various kinds of anti-collision algorithms available in the RFID system for efficiently identifying multiple tags. The performances of the anti-collision algorithms, however, are often very difficult to evaluate and predict in practice. In this paper, we present the performance of the anti-collision algorithm used in the EPCglobal Gen2 standard in an AWGN environment. We have observed that, when identifying 100 tags, it requires approximately 1.3 times more time in the AWGN environment having Eb/No 5 dB, and 4.7 times in the AWGN environment having Eb/No 4 dB, comparing with the noise free environment. Also shown is that the anti-collision performance drastically degraded if the Eb/No falls below 3 dB.