Data block construction method for single carrier frequency domain equalized soqpsk-tg signal

Abstract

The invention discloses a data block construction method of single carrier frequency domain equalization SOQPSK-TG signal. The data block construction method of the TG signal mainly solves the problems that the interfix symbol segments inserted in the prior art are too long and do not conform to the phase continuity. The implementation scheme is as follows: the randomly generated binary symbols are divided into two sub-blocks at the sending end, and the second sub-block is used as a cyclic prefix; according to the first sub-block, the phase states of SOQPSK-TG signals are equal and their four-state transitions are trellis diagrams, and the infrafix symbols are obtained. The SOQPSK is constructed by inserting an infrafix symbol fragment between the first and second sub-blocks and insertinga cyclic prefix before the first sub-block TG Signal Data Block. The invention can ensure frequency domain equalization and phase continuity, reduce the length of inserting intrafix symbol fragments,improve the utilization rate of bandwidth, and can be used for data transmission, cyclic prefix insertion or frequency domain equalization.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method for constructing a data block, which can be used for data transmission, cyclic prefix insertion, and frequency domain equalization to eliminate intersymbol crosstalk. Background technique [0002] With the development of modern aviation communication technology, the communication environment is becoming more and more complex, and communication resources are increasingly scarce, so the power utilization and bandwidth utilization of the communication system are particularly important. Continuous phase modulation CPM has constant envelope characteristics and high-efficiency spectrum characteristics. These two characteristics make CPM especially suitable for aeronautical communication. Shaped offset quadrature phase shift keying SOQPSK signal is a kind of CPM signal. It has a series of advantages such as complete constant envelope characteristics, ...

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Problems solved by technology

Jun Tan and Gordon L.Stüber mentioned a method of data block construction in "Frequency-Domain Equalization for ContinuousPhase Modulation", that is, the phase zeroing method, which needs to insert two tail symbols of the same length, but does not explain the specific calculation method, just determine the length of the tail symbol according to the state grid diagram of the CPM to make it return to the zero state from any state of the state grid diagram; Tayyaba Azmat and Salman Fayyaz Khan et al. In ", a method of constructing data blocks is proposed, that is, a segment of intrafix symbols is inserted between data blocks, but the resulting intrafix symbol segments do not meet the condition of phase continuity in theory

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