Deep space exploration and utilization are all along the
dreams of human beings. Besides the technologies of
launching and controlling the explorer, deep space
communications plays an important role in deep space
exploration. Compared with common terra and satellite
communications, deep-space communications presents
a more challenging environment for data
communications, such as long distance, very low signal
noise ratio, high signal propagation delays and data
corruption rates, asymmetric bandwidth and so on.
Besides the technologies of sender, receiver and
antennas, image source coding, channel coding, modulation
and demodulation and deep space network are
key technologies and play a very important role in the
research of deep space communication. This paper will
discuss the above four key technologies respectively
with emphasis on the application of communications
between Mars and earth.
