OFDM peak-to-average ratio suppression method based on alternating direction multiplier method
A technology of alternating direction multiplier and peak-to-average ratio suppression, which is applied in the field of OFDM peak-to-average ratio suppression based on the alternating direction multiplier method, can solve the problems of high computational complexity and reduce the peak-to-average ratio of OFDM signals, and achieve computational complexity Low, reduce the bit error rate, the effect of excellent bit error performance
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[0028] Example 1
[0029] Orthogonal frequency division multiplexing, OFDM, is an important multi-carrier modulation technology, which has been widely used in modern wireless communication systems. One of the biggest shortcomings of OFDM is that it causes the peak-to-average ratio of the signal to be relatively large. However, the power amplifier of the transmitter is limited in power, and a large peak-to-average ratio will cause the power amplifier to enter the nonlinear saturation region, causing in-band interference and out-of-band radiation to occur in the signal. Some methods in the prior art can effectively reduce the peak-to-average ratio of the OFDM signal, and at the same time obtain a better system error rate, but their computational complexity is relatively high, which hinders practical engineering applications. The present invention has carried out research on this, taking minimizing data carrier interference as the objective function, peak-to-average ratio and free ...
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[0038] Example 2
[0039] The OFDM peak-to-average ratio suppression method based on the alternating direction multiplier method is the same as that of the embodiment 1. The optimization described in step (3) with one of the two solutions is modeling, solving, and obtaining the optimal solution. The modeling and solving process of 1 includes the following steps:
[0040] (3.1.a) Establish a direct model: the objective function is set to minimize the data carrier interference, and the following direct model is established with the peak-to-average ratio and free carrier power as the constraints, which is the model :
[0041] Objective function:
[0042] Restrictions:
[0043]
[0044] Ac=x
[0045] Among them, N is the number of subcarriers, l is the oversampling factor, c∈C N Represents OFDM frequency domain signal, x∈C lN Represents the corresponding time domain signal. In the objective function, c represents the optimized OFDM signal, c o Is the original OFDM signal; S D Is a bina...
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[0064] Example 3
[0065] The method for suppressing the OFDM peak-to-average ratio based on the alternating direction multiplier method is the same as that in the embodiment 1-2. The modeling of the scheme 2 of the present invention includes the following steps:
[0066] (3.2.a) Establish a relaxation model: introduce two auxiliary variables u and w, use the first and second two auxiliary variables to relax the direct model in (3.1.a) to obtain the following relaxation model, which is the model :
[0067] Objective function:
[0068] Restrictions:
[0069]
[0070] Ac=u
[0071] x=w
[0072] among them, Is the penalty parameter.
[0073] Building the augmented Lagrangian function of the relaxation model as follows:
[0074]
[0075] Where y 1 ∈ C lN ,y 2 ∈ C lN These are the Lagrangian multipliers corresponding to the constraints Ac=u and x=w, respectively.
[0076] (3.2.b) Apply the ADMM method to the relaxation model to obtain the relaxation ADMM model: apply the ADMM method to the...
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