Baseband Modem Design for Multiparty Voice Communications

摘要

This paper presents a design of the TDMA baseband modem to support 4-party voice communications. The baseband modem supports an ad-hoc function to join the voice networks. The designed baseband modem is expandable by adding slots up to 8 nodes since the bandwidth is limited TDMA method and voice quality. To implement the 4-party communications, the baseband modem has a cycle network controller, a sync time controller, a buffer controller and an asynchronous serial device. The sync time controller is implemented to synchronize precisely to the master's control signal for slaves. The protocol is programmed on Xilinx Zynq 7000 with Verilog HDL. The baseband modem is tested and verified its functions for voice communications, and its measured maximum delay time is less than 30msec for voice transmission.