Abstract: Wireless access is an important supplement and backup for public wire access telecommunications networks, especially for countryside and scattered users in remote areas. To satisfy the needs of countryside users and the practical demand of Anhui Province, a wireless access system was designed based on the microwave multipoint distribution systems (MMDS) used for local microwave television networks. This work was conducted in cooperation with the broadcast and television transmission center of Huaibei city. The local frequency of microwave television was used for our wireless access, and the unilateral television transmission was extended to bidirectional transmission. The utilization efficiency of spectrum resources was improved. The design is conducive to the realization of green wireless technology and systems in future.

Key words: MMDS (microwave multipoint distribution systems), wireless access, bidirectional transmission