A multi-carrier detection method for suppressing channel interference
A technology of channel interference and detection method, which is applied in the shaping network, digital transmission system, baseband system components, etc. Large and other problems, to achieve the effect of improving spectral efficiency and power efficiency, suppressing ISI and ICI interference, and high spectral efficiency and power efficiency
Active Publication Date: 2019-10-25
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology
However, the commonly used multi-carrier transmission and detection methods still have certain technical defects.
First of all, in order to resist inter-symbol interference (ISI), it is necessary to add a sufficiently long cyclic prefix (CP). The addition of CP will not only reduce the system spectral efficiency, but also increase the overhead of system transmission power; moreover, the commonly used multi-carrier transmission technology uses The waveform of the time domain is a rectangular window, and the corresponding frequency domain is a sinc function. Due to the orthogonality between the functions, the waveform can achieve the best performance in the Gaussian white noise channel (AWGN), but There is nothing that can be done about time-selective fading in the channel and inter-carrier interference (ICI) caused by symbol timing deviation; finally, the commonly used multi-carrier transmission and detection methods have large out-of-band radiation power (OOB). In this case, a certain frequency band needs to be reserved as a guard interval, which reduces the spectral efficiency of the system
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[0031] refer to Figure 1 to Figure 2 .
[0032] figure 1 It is a schematic block diagram of the transmitting end of the present invention. It includes a serial-to-parallel conversion module 1, a constellation map mapping module 2, a first data interleaving module 3, a multi-carrier modulation module 4 and an up-conversion module 5. The transmitting end converts the serial data into parallel data through the serial-to-parallel conversion module 1, and the constellation map mapping module 2 performs constellation map mapping on the information bit sequence after the serial-to-parallel conversion according to the adopted symbol-level modulation method to form a multi-channel digital signal ; The first data interleaving module 3 divides the real part and the imaginary part of the data into two paths to send again, and carries out phase adjustment to each subcarrier of the two paths of the real and imaginary parts, and then the multi-carrier modulation module 4 uses the filter b...
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The invention relates to a multi-carrier detection method for suppressing channel interference in the field of broadband wireless communication, and is particularly suitable for debugging, demodulation and reception of broadband wireless communication signals. Serial-to-parallel conversion, constellation map mapping, data interleaving, pilot insertion, baseband pulse shaping, and up-conversion are performed at the sending end; at the receiving end, the down-conversion process is first performed, and then channel equalization is used to form an estimate of the transmitted symbol, and then the Pulse matching, data interleaving, constellation diagram mapping, and parallel-to-serial conversion finally restore the original transmitted code stream. The invention adopts an all-digital signal processing method, does not need to add a cyclic prefix, and can effectively reduce the complexity of time-frequency double-selective fading channel equalization. The main circuit components are realized by FPGA or ASIC, and the difficulty of design and debugging is low.
Description
technical field [0001] The invention relates to a multi-carrier detection method for suppressing channel interference in the field of broadband wireless communication, and is particularly suitable for debugging, demodulation and reception of broadband wireless communication signals. Background technique [0002] The multi-carrier transmission and detection method is an effective broadband wireless data transmission method, which can effectively resist channel multipath fading and improve the effective transmission rate of the system at the same time. However, the commonly used multi-carrier transmission and detection methods still have certain technical defects. First of all, in order to resist inter-symbol interference (ISI), it is necessary to add a sufficiently long cyclic prefix (CP). The addition of CP will not only reduce the system spectral efficiency, but also increase the overhead of system transmission power; moreover, the commonly used multi-carrier transmission t...
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IPC IPC(8): H04L25/03
CPCH04L25/03006H04L25/03012H04L25/03159H04L25/03821H04L2025/03414
Inventor 任文成
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP