Orthogonal Frequency Division Multiplexing Transmission Method Based on Joint Orthogonal Transform and Signal Interleaving

Abstract

The invention discloses an orthogonal frequency division multiplexing transmission method with joint orthogonal transmission interweaved with signals. In a transmitter, channel coding processing is conducted on the bit sequence output by an information source through an encoder; in a receiver, a demodulator outputs a bit sequence and channel decoding processing is conducted through a decoder; in the transmitter, the bit sequence is output by the channel encoder, and modulation processing is conducted on the bit sequence through a modulator; in the receiver, demodulation processing is conducted on signal extraction output signals through the demodulator; in the transmitter, empty symbols are inserted into the modulation signal group output by the modulator; in the receiver, pulse disturbance information is extracted through the empty symbols, and an expectation maximization method is used to reconstruct the pulse disturbance signals; in the receiver, deinterleaving output signals reconstruct the pulse disturbance signals through expection maximization, then the pulse disturbance signals are sent into a pulse disturbance eliminating circuit to eliminate the disturbance signals; in the receiver, inverse orthogonal transformation is conducted on the signals after pulse disturbance is eliminated. The orthogonal frequency division multiplexing transmission method with joint orthogonal transmission interweaved with the signals can eliminate non-correlated random pulse disturbances, and can eliminate strong-correlated pulse disturbances.

Description

technical field [0001] The invention relates to a data transmission method of a traffic management system in civil aviation. In particular, it relates to an orthogonal frequency division multiplexing transmission method combining orthogonal transformation and signal interleaving. Background technique [0002] The civil aviation broadband aviation data link is used to provide high-speed voice and data communication services between aircraft and ground base stations. The broadband aviation data link is an important part of the civil aviation aviation telecommunication network and one of the important infrastructures of the civil aviation future air traffic management system. In order to achieve high-speed and efficient data transmission between civil aircraft and ground base stations, overcome the frequency selective fading caused by high-speed data communication of air-ground links, and improve the reliability of air-ground link transmission, the International Civil Aviation ...

AI Technical Summary

Problems solved by technology

In practical applications, this method has the following two problems: the position of pulse interference is not easy to determine, and the ICI interference is caused after the pulse is extinguished

There are also two problems in the pulse clipping method: the pulse clipping value is not easy to determine, and the signal still has pulse interference after pulse clipping

In the broadband air data link system, the pulse interference generated by the range finder is a strongly correlated pulse interference, so the compressed sensing method cannot be directly applied to the reconstruction and elimination of the pulse interference of the range finder in the OFDM system

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