A carrier synchronization method and system for helicopter satellite communication
A carrier synchronization and satellite communication technology, applied in the field of satellite communication, can solve the problems of inability to demodulate, inability to correct phase ambiguity, difficulty in carrier synchronization, etc.
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[0073] First, an example is given to illustrate the system model of the transmitting end on the helicopter. In the following embodiments, the channel coding adopts LDPC coding and QPSK modulation:
[0074] The baseband model of helicopter satellite communication is as follows: figure 1 shown. Suppose the information bit sequence to be sent is a, the bit sequence after LDPC encoding is b, and after interleaving and mapping, a symbol sequence d is obtained. Sequence d is grouped with L symbols as a group, and p reference symbols are added to each group to form a transmission sequence x in which reference symbols are evenly inserted, x=[x 1 ,x 2 ,...,x k ,...,x N ]. After passing through the helicopter satellite communication channel, the received signal can be expressed as
[0075] y=diag{h}x+n(23)
[0076] where h=[h 1 ,h 2 ..., h k ,...,h N ], A k and Indicates the amplitude change and phase change brought by the channel, n=[n 1 ,...n k ,...,n N ], n k is m...
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