Wireless transmission device, wireless reception device, remote communication monitoring system and wireless communication method
AssigneeMitsubishi Electric Corporation
InventorAkinori Nakajima
Life of this patent
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Abstract
A wireless transmission device includes a repetition coding unit that prepares a basic waveform having a length less than a frequency conversion length that is used in a wireless reception device, generates a repetition waveform having a length greater than or equal to the frequency conversion length by repeating the basic waveform a plurality of times, and generates a data frame including the repetition waveform and a known signal.
Claims18
A wireless transmission device comprising
- a repetition coding circuitry to prepare a basic waveform of a data frame having a length less than a frequency conversion length of a wireless reception device, generate a repetition waveform having a length greater than or equal to the frequency conversion length by repeating the basic waveform a plurality of times, and generate the data frame including the repetition waveform and a known signal, wherein the repetition coding circuitry performs differential coding,
- wherein the repetition coding circuitry adjusts a symbol at a predetermined position of each basic waveform included in the repetition waveform such that a differentially coded sequence maintains the repetition waveform.
A wireless communication method for a wireless reception device to receive a multiplexed signal from a plurality of wireless transmission devices, wherein
- the wireless communication method includes, by each of the plurality of wireless transmission devices:
- generating a repetition waveform by repeating a basic waveform of a data frame a plurality of times, the repetition waveform having a length greater than or equal to a frequency conversion length of the wireless reception device, the basic waveform having a length less than the frequency conversion length;
- adjusting a symbol at a predetermined position of each basic waveform included in the repetition waveform such that a differentially coded sequence maintains the repetition waveform;
- generating a data frame including the repetition waveform and a known signal;
- and
- transmitting a signal including the data frame, and
- the wireless communication method includes, by the wireless reception device:
- receiving a reception signal transmitted by the plurality of wireless transmission devices, the reception signal being the multiplexed signal;
- converting the reception signal multiplexed into a frequency domain signal;
- separating the reception signal after frequency conversion into a plurality of signals corresponding one-to-one to the wireless transmission devices;
- converting each of the signals separated into a time domain signal;
- and
- decoding a repetition waveform included in the time domain signal obtained through conversion.
Dependencies are inferred from the claim text.