Evaluation of Multiple Access Techniques for Simultaneous Space Communications and Tracking

The National Aeronautics and Space Administration has conducted a comprehensive study to identify the most appropriate and efficient modulation, coding, multiple access and link protocol options for future space communication links supported by NASA´s Ground Network, space network, deep space network, and earth-based ground terminals and in-situ relay satellites envisioned for Constellation Program mission support at the Moon and Mars. This paper briefly describes the study process and summarizes the multiple access recommendations for future NASA space communications.