2.5.3.1 Physical Layer Interface ( PHY )2.5.3.1.1 PHY REQUIREMENTS. The PHY is an essential part of the wirelessaccess network. Its requirements are summarized below.1 Long Range Transmission. The system target is a 5 km cell radius with 10 mW WT transmission power.2 Use of a Modulation Scheme with High Frequency Utilization. A huge number of WTs should be supported with limited frequency resources.3 Short Overhead. Because WAUN data traffi c may be dominated by short packets, the PHY overhead of each packet should be as short as possible to avoid degrading the transmission efficiency.4 Compact, Low Power Consumption WTs. WTs should be compact and have the longest possible battery life and lowest possible cost.
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