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f-ofdm wireless transmission method based on parallel interference cancellation

A technology for wireless transmission and interference elimination, applied in transmission systems, digital transmission systems, baseband systems, etc., can solve problems such as loss of spectrum efficiency, achieve strong anti-Doppler expansion capabilities, improve bit error rate performance, and effective and reliable communication Effect

Active Publication Date: 2022-04-12
BEIJING UNIV OF POSTS & TELECOMM
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the encoding and decoding at the sending and receiving ends of these two algorithms is relatively simple, and no redundant functional modules are introduced, about 50% of the spectrum efficiency will be lost

Method used

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  • f-ofdm wireless transmission method based on parallel interference cancellation
  • f-ofdm wireless transmission method based on parallel interference cancellation
  • f-ofdm wireless transmission method based on parallel interference cancellation

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Embodiment

[0057] The F-OFDM wireless transmission method based on parallel interference cancellation includes:

[0058] Step A, signal processing flow at the transmitter:

[0059] Step A1, at the transmitting end, input the serial bit signal stream to the mapper for digital modulation, in any sub-band, the number of sub-carriers in the sub-band is N, after serial-to-parallel conversion, the output parallel symbol block is:

[0060] X = [X(0), X(1), ..., X(N-1)] T ,

[0061] In the above steps, the serial bit signal stream is input to the mapper for digital modulation, that is, constellation mapping. If the order is M, each M bit will be mapped into a symbol. The OFDM system has N subcarriers in total. It means that each OFDM symbol contains N symbols, and N-point FFT / IFFT will be used in the signal processing process. At the transmitting end, the input of IFFT should be a parallel signal, so before doing IFFT, serial-to-parallel conversion is required. Then the frequency-domain paral...

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Abstract

The invention discloses a F-OFDM wireless transmission method based on parallel interference elimination, which includes: at the transmitting end, inputting a serial bit signal stream to a mapper for digital modulation; using TD-PIC or SD-PIC technology to make the signals respectively in Two parallel branch signals are transmitted; then input to the sub-band filter for filtering processing; digital-to-analog conversion and radio frequency modulation are performed, and then transmitted to the wireless channel through the antenna; at the receiving end, for TD‑PIC, a buffer is added Align the two signals in the time domain; for SD‑PIC, after aligning the two signals, perform signal detection through the estimated channel impulse response matrix, and then perform matched filter processing on the two parallel branch signals; Remove CP and serial-to-parallel conversion; perform equal-gain combination to obtain the received signal of the sub-band; judge and demap the received signal to restore the bit stream. The wireless transmission method of the invention improves the bit error rate performance and has stronger anti-Doppler expansion capability.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a filtered orthogonal frequency division multiplexing (Filtered Orthogonal Frequency Division Multiplexing, F-OFDM) wireless transmission method based on Parallel Interference Cancellation (Parallel Interference Cancellation, PIC). Background technique [0002] The high-speed mobile scenario is an important sub-scenario of the fifth-generation mobile communication system (5G). Among them, the test speed of the high-speed train is as high as 570km / h, and the moving speed of the aircraft can reach 1000km / h. Orthogonal Frequency Division Multiplexing (OFDM), as the most typical multi-carrier transmission technology, has played a vital role since the fourth generation mobile communication system (4G). However, the OFDM system was originally designed for quasi-static fading channels. In high-speed mobile scenarios, the Doppler effect caused by the rapid move...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/03
CPCH04L27/2691H04L27/2601H04L25/03012
Inventor 刘喜庆王兆褀秦伟高镝翔彭木根
Owner BEIJING UNIV OF POSTS & TELECOMM