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Initial Ranging (IR) involves detecting the Binary Phase Shift Keying (BPSK) code transmitted by the new Subscriber Station (SS). In this paper, the authors formulate a simple detector using the Neyman-Pearson theorem (NPT) for single code detection in IEEE 802:16-compliant Time Division Duplex (TDD) Orthogonal Frequency Division Multiple Access (OFDMA) systems. Exploiting the BPSK structure in the ranging code together with the time-invariant channel, a novel method for separating multiple ranging codes is presented. The NPT-based detector is then used to detect the separated codes. The proposed detector is computationally simple and has favorable detection performance for practical implementation.
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