Generating method and receiving method of leading symbols

Abstract

The invention provides a generating method and a receiving method of leading symbols, and a generating device and a receiving device of the leading symbols. Since a time domain symbol has a first kind of three-segment structure, or a second kind of three-segment structure, or the free combination of a plurality of the first kind of three-segment structures and a plurality of the second kind of three-segment structures which are arranged in a random order, so that coherent detection is realized, the problem of decreasing noncoherent detection performance is solved. In addition, a predetermined sequence generation rule of a frequency domain main sequence comprises: giving different root values to predetermined sequences; and / or giving the same root value to the predetermined sequences, and carrying out circulating shifting on the generated sequences. The obtained frequency domain main sequence is utilized to transmit signaling needed by the system, and the transmission efficiency is improved.

Description

[0001] This application is a divisional application of the original application, the application number of the original application is 201510052202.5, the application date is January 30, 2015, and the title of the invention is "Method for generating and receiving leading symbols". technical field [0002] The invention belongs to the technical field of transmission of broadcast communication systems, and in particular relates to a method for generating and receiving a preamble symbol and a corresponding device. Background technique [0003] At present, the method for realizing time synchronization between the transmitting end and the receiving end in the OFDM system is basically based on preamble symbols. The preamble symbol is a symbol sequence known to both the sender and the receiver of the OFDM system. The preamble symbol marks the beginning of the physical frame (named P1 symbol), and only one P1 symbol or multiple P1 symbols appear consecutively in each physical frame. ...

AI Technical Summary

Problems solved by technology

[0009] The problem solved by the present invention is that the time-domain main signal of the preamble symbol in the prior art only uses different root values ​​of the constant-envelope zero-autocorrelation CAZAC sequence to transmit signaling in the frequency domain, resulting in insufficient system transmission efficiency, and does not It does not consider the number of time-domain symbols selected by the format control part PFC to transmit the required signaling to meet the needs of system transmission

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