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In this paper, using the EDGE system as an example, the paper applies a Kalman-filter power control method based on interference tracking and prediction to packet voice service in wireless networks. The results reveal that power control significantly improves the spectral efficiency by enabling 1/3 frequency reuse while maintaining a stringent requirement of 2% packet loss probability for voice service. More specifically, for allocated spectrum of 1.8, 3.6 and 5.4 MHz, the 1/3 reuse with the Kalman power control can yield 102.5%, 49.5% and 32.5% improvement in spectral efficiency, respectively, over 3/9 reuse (regardless of whether or not power control is used).
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