Same-frequency multi-waveform high-capacity multi-carrier modulation method
A multi-carrier modulation and large-capacity technology, applied in the modulation carrier system, multi-frequency code system, digital transmission system, etc., can solve the problems of peak-to-average power ratio, hinder development, high sensitivity to frequency offset and phase noise, and achieve expansion Quantity, reduced reliability, increased spectrum utilization and effect of symbol transmission rate
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Embodiment 1
[0022] A large-capacity multi-carrier modulation method with multiple waves at the same frequency, see figure 1 , the large-capacity multi-carrier modulation method includes the following steps:
[0023] 101: expand each frequency subcarrier to m subcarriers with the same frequency but different waveforms;
[0024] That is, r subcarriers are expanded into r*m subcarriers; N subcarriers are used when transmitting N signals, and only the frequency resources occupied by r=N / m subcarriers need to be occupied;
[0025] 102: For the nth subcarrier Perform scale and time-shift transformations;
[0026] Among them, the results of scale and time shift transformation are:
[0027] get the form as Where k=0,1,...,r,r+1,...,sr-1, s is the aliasing coefficient, ir / m is the delay factor, i=0,1,...m- 1 is the serial number of the same frequency subcarrier;
[0028] 103: The signal modulated to the subcarrier is demodulated at the receiving end through the reconstruction algorithm in ...
Embodiment 2
[0031] Combine below figure 1 and figure 2 The scheme in embodiment 1 is introduced in detail, see the description below for details:
[0032] 201: Design of multi-wave subcarriers at the same frequency;
[0033] Assuming that there are N channels of signals to be transmitted, N subcarriers are required, and traditional multi-carrier modulation requires N orthogonal carrier frequencies. In the embodiment of the present invention, each frequency subcarrier is expanded into m subcarriers of the same frequency but with different waveforms (that is, different delay parameters). Therefore, when N subcarriers are used to transmit N signals, it only needs to occupy frequency resources occupied by r=N / m orthogonal subcarriers, thereby effectively improving frequency band utilization.
[0034] 202: Select r orthogonal subcarriers, and transform each subcarrier;
[0035] For example: for the nth (n=0, 1, ..., r-1) subcarrier Perform scale and time-shift transformations to obtain ...
Embodiment 3
[0041] Combine below image 3 The scheme in embodiment 1 and 2 is carried out feasibility verification, see the following description for details:
[0042] image 3 Given that the aliasing parameter s is 1.5 and the number of co-frequency carriers is m=8, the sinusoidal signal is used as the original signal (signal), and the reconstructed signal at the receiving end is (AE-Fourier Base).
[0043] image 3 The original signal and the reconstructed signal in almost coincide, from image 3 It can be seen that this method can better restore the original signal, so this method can improve the effect of spectrum utilization without reducing the reliability of transmission.
[0044] Those skilled in the art can understand that the accompanying drawing is only a schematic diagram of a preferred embodiment, and the serial numbers of the above-mentioned embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodime...
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