A low-complexity slm algorithm for reducing papr of fbmc-oqam system
A low-complexity, algorithmic technology, applied in transmission systems, multi-carrier systems, multi-frequency code systems, etc., can solve problems such as high complexity, PAPR reduction, large memory and computational complexity
Inactive Publication Date: 2019-10-29
WUHAN UNIV OF SCI & TECH
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Problems solved by technology
[0004] FBMC-OQAM cannot use the method of PAPR reduction in OFDM due to its overlapping structure
At present, some scholars have discussed the PAPR reduction scheme of the FBMC-OQAM system of PAM symbols, but these schemes are limited to PAM symbols and have poor BER performance
Some scholars have realized the reduction of the PAPR of the FBMC-OQAM system by using the clipping scheme of iterative compensation, but the system needs to design a complex receiver to meet the compensation of the clipping noise
Multi-module joint optimization (MBJO) technology and sliding window speech reservation (SWTR) technology are also used in the PAPR reduction of FBMC-OQAM system, but they have a higher complexity
Some scholars have proposed an overlapping selective mapping (OSLM) method, which proposes that the independence assumption between consecutive symbols is not valid, considering the natural overlap of FBMC-OQAM, but has a huge memory and computational complexity
Later, some scholars proposed a Dispersion Selective Mapping (DSLM) method, which is similar to the traditional SLM, while considering the overlap of FBMC-OQAM, and solved the nature of the time dispersion of the FBMC-OQAM signal, but the calculation is The PAPR value in the interval [0, 4T] has relatively high complexity
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[0030] A kind of low-complexity SLM algorithm that the present invention proposes reduces FBMC-OQAM system PAPR, comprises the following steps:
[0031] S1. Initialize the rotation vector first, and generate U phase rotation vectors with a length of N:
[0032]
[0033] in:
[0034] S2. Multiply the current data block with the rotation vector, each input data block X m are multiplied with U different rotation vectors:
[0035]
[0036] Among them: Represents matrix point-to-point multiplication;
[0037] S3, the signal is sampled, filtered and modulated. Due to the overlapping nature of the FBMC-OQAM signal, it is necessary to consider the signal before the current data block, so as to obtain the following signal:
[0038]
[0039] Where: m∈[0,2π], t∈[0,(m+1 / 2)T+4T];
[0040] S4, calculate signal x according to the following formula u (t) PAPR, the calculation interval is T c ;
[0041]
[0042] analyze figure 2 The simulation results show that the power o...
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The invention discloses a low-complexity SLM algorithm for reducing the PAPR of an FBMC-OQAM system, namely, a low-complexity dispersion selective mapping (LD-SLM) algorithm. The algorithm comprises the following steps: S1, generating U phase rotation vectors with a length of N; S2, multiplying a current data block by the rotation vectors; S3, carrying out signal sampling, filtering and modulation; S4, carrying out PAPR calculation, wherein a calculation interval is two middle and consecutive symbol periods Tc; S5, saving the rotation vector u<min> for the minimum PAPR value; and S6, selecting the optimum rotation vector according to u<min>, updating an input signal matrix (as shown in the description), and returning to S2 to repeat the steps for a signal X<m+1> in a next signal period until m is equal to M-1. The algorithm provided by the invention has the advantages that in addition to an optimized complexity, the system PAPR is reduced; and naturally overlapped parts of the FBMC-OQAM signals are considered, and the search time is shortened, so that the algorithm is advantageous over the dispersion selective mapping (DSLM) algorithm in terms of complexity.
Description
technical field [0001] The invention relates to an optimization method of a communication technology, in particular to a low-complexity SLM algorithm for reducing the PAPR of an FBMC-OQAM system. Background technique [0002] Filter Bank Multi-Carrier (FBMC) is a multi-carrier transmission scheme with high spectrum efficiency, moderate implementation complexity and no need for synchronization. Offset Quadrature Amplitude Modulation (OQAM) can eliminate the inter-carrier interference (ICI) that will be caused by the overlapping of sub-bands in the FBMC system. The combination of FBMC and OQAM has many advantages that OFDM technology does not have, such as excellent frequency positioning and lower power spectral density (PSD) sidelobes, etc. It is more suitable for 5G radio access technology (RAT) than OFDM. FBMC-OQAM systems are increasingly emerging as frontrunners for the upcoming 5G Radio Access Technology (RAT) over airwaves. Like Orthogonal Frequency Division Multiplex...
Claims
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IPC IPC(8): H04L27/26H04L27/34
CPCH04L27/2602H04L27/2614H04L27/2698H04L27/3488
Inventor吴建霞杨永立潘畅
OwnerWUHAN UNIV OF SCI & TECH