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Multi-resident burst frame synchronization method for SC-FDE data link
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A SC-FDE, data link technology, applied in multi-frequency code systems, digital transmission systems, electrical components, etc., can solve problems such as weak signal frame synchronization technology
Active Publication Date: 2021-03-26
BEIJING RES INST OF TELEMETRY +1
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[0005] The object of the present invention is to provide a kind of SC-FDE data link multi-resident burst frame synchronization method for the problem that SC-FDE signal frame synchronization technology is not strong, In this method, aiming at the short-time burst transmission frame data sequence between networking nodes, the frame structure is designed to include preamble data, unique word UW data and payload data; based on this structure, the differential correlation function based on preamble sequence and the unique word sequence based The autocorrelation function; then according to the leading sequence high and low threshold λpH, λpL, UW sequence high and low threshold λuH, λuL , design multi-resident frame synchronization process
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Embodiment 1
[0059] Such as Figure 1-2 Shown, a kind of SC-FDE data link multi-resident burst frame synchronous method is characterized in that: comprise the steps:
[0060] S1. Obtain the sequence vector: a time slot frame of the transmitter burst SC-FDE signal includes a preamble sequence and M UW-load-UW sequences, and the UW-load-UW sequence includes the pre-UW sequence and the load sequence in turn and the post-UW sequence, the pre-UW sequence and the post-UW sequence are combined into a UW sequence, and the sequence vector S of the slot frame is obtained after the preamble sequence, the UW sequence and the load sequence are framed s , sequence vector S s Includes leader sequence vector S p , UW sequence vector S u , load sequence vector S d , leading segment sequence vector S p has a length of N p , UW sequence vector S u has a length of N u , load sequence vector S d has a length of N d ;
[0061] S2, obtain the baud rate symbol data: the sequence vector S s After passi...
Embodiment 2
[0067] Such as Figure 1-2 Shown, a kind of SC-FDE data link multi-resident burst frame synchronous method is characterized in that: comprise the steps:
[0068] S1. Obtain the sequence vector: a time slot frame of the transmitter burst SC-FDE signal includes a preamble sequence and M UW-load-UW sequences, and the UW-load-UW sequence includes the pre-UW sequence and the load sequence in turn and the post-UW sequence, the pre-UW sequence and the post-UW sequence are combined into a UW sequence, and the sequence vector S of the slot frame is obtained after the preamble sequence, the UW sequence and the load sequence are framed s , sequence vector S s Includes leader sequence vector S p , UW sequence vector S u , load sequence vector S d , leading segment sequence vector S p has a length of N p , UW sequence vector S u has a length of N u , load sequence vector S d has a length of N d ;
[0069] S s =[S p ,S u1 (1),S d (1),S u2 (1),S u1 (2),S d (2),S u2 (2),......
Embodiment 3
[0099] Such as Figure 1-2 Shown, a kind of SC-FDE data link multi-resident burst frame synchronous method is characterized in that: comprise the steps:
[0100]S1. Obtain the sequence vector: a time slot frame of the transmitter burst SC-FDE signal includes a preamble sequence and M UW-load-UW sequences, and the UW-load-UW sequence includes the pre-UW sequence and the load sequence in turn and the post-UW sequence, the pre-UW sequence and the post-UW sequence are combined into a UW sequence, and the sequence vector S of the slot frame is obtained after the preamble sequence, the UW sequence and the load sequence are framed s , sequence vector S s Includes leader sequence vector S p , UW sequence vector S u , load sequence vector S d , leading segment sequence vector S p has a length of N p , UW sequence vector S u has a length of N u , load sequence vector S d has a length of N d ;
[0101] S s =[S p ,S u1 (1),S d (1),S u2 (1),S u1 (2),S d (2),S u2 (2),...,...
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Abstract
The invention provides an SC-FDE data link multi-resident burst frame synchronization method, and the method comprises the steps: designing a frame structure which comprises leader segment data, unique word UW data and load data for a short-time burst transmission frame data sequence between networking nodes, and respectively calculating a differential correlation function based on a leader sequence and an autocorrelation function based on a unique word sequence based on the structure; and designing a multi-resident frame synchronization process according to the high and low thresholds [lambda]pH and [lambda]pL of the leader sequence and the high and low thresholds [lambda]uH and [lambda]uL of the UW sequence. According to the method, the frame synchronizationdetection performance can beeffectively improved by utilizing a plurality of UW sequences when the normalized frequency deviationdelta(f) of the system is less than or equal to 0.001 level. In the invention, the multi-mode timeslot frame can comprise a plurality of sub-frames and can be used for a wireless networking communication system based on a burst mode; the number M of frame structure leading segments, the number 2MK of UW segments and the variable differential correlation lengths LP and LU can be flexibly designed according to system requirements so as to meet the requirements of communication between differentnetworking nodes and carrier synchronization precision indexes thereof.
Description
technical field [0001] The present invention relates to the technical field of dissemination of digital information, in particular to the dissemination of digital information. Background technique [0002] In the network communication system, especially in the swarm ad hoc network system, each network node needs to use the short-term burst transmission mode to communicate, and the broadband communication needs to solve the problem of multipath interference. Orthogonal frequency division multiplexing OFDM technology or single carrier frequency domainequalization SC-FDE technology can be used to realize short-time burst transmission and resist channel fading. [0003] The SC-FDE signal has the characteristics of low peak-to-average ratio and anti-multipath interference. There are few research literatures on the signal frame synchronization technology of this system. The frame structure designed in the document "Zhu Liangbin; Wen Yunfeng; Sang Huiping. The design of the fram...
Claims
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