Orthogonal frequency division multiplexing modulation system and non-orthogonal active interference cancellation method for frequency domain extension

An active interference, orthogonal frequency division technology, applied in the field of wireless communication, can solve the problem of symbol time length CP-OFDM symbol format incompatibility, destroying CP-OFDM signal waveform format, reducing system energy efficiency and other problems

Active Publication Date: 2021-04-20
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Abstract
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Problems solved by technology

[0008] (1) The existing non-orthogonal interference cancellation method fails to suppress the spectrum leakage of OFDM most effectively, and it is also not conducive to reducing the interference of non-orthogonal CCs to data subcarriers in the system
[0009] (2) The existing non-orthogonal interference cancellation method reduces the energy efficiency of the system;
[0010] (3) The existing method of combining windowing and active interference cancellation leads to the problem of incompatibility between symbol time length and CP-OFDM symbol format
However, windowing generally destroys the format of the CP-OFDM signal waveform

Method used

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  • Orthogonal frequency division multiplexing modulation system and non-orthogonal active interference cancellation method for frequency domain extension
  • Orthogonal frequency division multiplexing modulation system and non-orthogonal active interference cancellation method for frequency domain extension
  • Orthogonal frequency division multiplexing modulation system and non-orthogonal active interference cancellation method for frequency domain extension

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Embodiment 1

[0123] figure 2 As shown, the present invention adopts windowing and frequency domain extended OFDM modulation system and active interference cancellation method (WFE-NAIC) to suppress the OFDM system transmitter block diagram of spectrum leakage. It includes a transmitter and a receiver, and the transmitter includes: a serial-to-parallel conversion module, which converts serial data into parallel data; a symbol mapping module, which maps binary information into multi-ary communication constellation symbols; a subcarrier mapping module, which converts Data symbols are assigned to appropriate subcarriers, and unused subcarriers are set to zero; multi-carrier modulation module completes modulation conversion from frequency domain to time domain; parallel-to-serial conversion converts parallel signals into serial signals; adds cyclic prefix The module adds a cyclic prefix to each serial OFDM time-domain symbol in the time domain; the windowing module adds a window to the time-do...

Embodiment 2

[0138] The invention provides a windowed OFDM system, including a transmitter and a receiver, and the transmitter includes: a serial-to-parallel conversion module, which converts serial data into parallel data; a symbol mapping module, which converts binary information Mapping to multi-ary communication constellation symbols; subcarrier mapping module, assigning data symbols to appropriate subcarriers, and setting unused subcarriers to zero; multicarrier modulation module, completing modulation conversion from frequency domain to time domain; Parallel-to-serial conversion, converting parallel signals into serial signals; adding cyclic prefix module, adding cyclic prefix to serial OFDM time domain symbols one by one in the time domain; windowing module, windowing and shaping time domain signals; spectrum leakage cancellation module, Using non-orthogonal active interference cancellation method to suppress the spectrum leakage of the transmitted signal; the up-conversion module co...

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Abstract

The invention belongs to the technical field of wireless communication, and discloses an orthogonal frequency division multiplexing modulation system and a frequency domain extended non-orthogonal active interference cancellation method. The method comprises: converting serial sending data into parallel data; mapping the binary information into a multi-system communication constellation symbol; distributing the data symbols to proper subcarriers; modulating the symbol from the frequency domain to the time domain; converting the parallel signal into a serial signal; adding a time domain cyclic prefix; windowing and forming the time domain signal; using a frequency domain extended non-orthogonal active interference cancellation method to suppress frequency spectrum leakage of the sent signal; converting the signal from a baseband signal to a band signal. According to the invention, the frequency spectrum leakage of the orthogonal frequency division multiplexing signal is greatly reduced to be lower than -80dB; the interference of interference cancellation signals on data is reduced and is lower than -80dB; the energy of interference cancellation subcarriers is reduced, and the energy efficiency of the system is improved; and meanwhile, the symbol waveform is kept compatible with the CP-OFDM symbol format.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an orthogonal frequency division multiplexing modulation system and a non-orthogonal active interference cancellation method of frequency domain expansion. Background technique [0002] At present, broadband wireless communication is facing a serious problem of insufficient spectrum resources. The OFDM modulation system widely used in broadband wireless communication has serious spectrum leakage, which reduces the spectrum efficiency. Suppressing the spectrum sidelobe of the OFDM signal is of great significance for improving the spectrum efficiency and alleviating the shortage of wireless spectrum resources. [0003] The main methods to suppress the spectrum leakage of OFDM signals include adding window method and active interference cancellation method (AIC), and they can also be used in combination. Among them, the non-orthogonal active interference ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCY02D30/70
Inventor 代光发陈少平饶文贵王勤杨杨
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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