Carrier synchronization method and system in helicopter satellite communication
A carrier synchronization and satellite communication technology, applied in the field of satellite communication, can solve problems such as signal occlusion, phase ambiguity, and phase ambiguity that cannot be corrected
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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 with Indicates the amplitude change and phase change brought by the channel, n=[n 1 ,...n k ,...,n N ], n k is...
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