Development and Performance Evaluation of TDCS Multiple Access System

In this paper, the transform-domain communication system based multi-user access system has been implemented and demonstrated via software-defined radio. A practical testbed with two National Instruments PXIe devices and four universal software defined radio reconfigurable input/output (USRP RIO) devices is presented for system implementation. A successive interference cancellation (SIC) receiver is designed to improve its multiuser performance. The testbed is capable of detecting interference and transmitting in real-time. Additionally, the centralized layout and distributed layout of system devices are both evaluated. We have demonstrated and demonstrated real-time seamless data transmission among six users, while avoiding environment interference. Details of system design including testbed synchronization, SIC receiver, and bit error rate are also presented.