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—The voice-over-Internet protocol (VoIP) has attracted a great deal of attention in the field of wireless mobile networks. In this paper, we propose an improved ertPS scheduling algorithm for VoIP services in IEEE Std 802.16e system. It can solve both the problems waste of uplink resources caused by the UGS algorithm as well as MAC overhead and access delay(More)
We have studied the space-time trellis code (STTC) design in OFDM systems. By the research, especially by simulation, it is shown that, in multi-flat fading channels, the STTC-OFDM system can potentially provide more coding gain. We also found that the optimal STTC design is important for OFDM when using space-time codes (STC). By following this conclusion,(More)
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