Mixed distribution optimization-based orthogonal frequency division multiplexing (OFDM) signal peak-to-average power ratio suppression method
A technology of mixed distribution and signal peaks, applied in the direction of multi-frequency code systems, etc., can solve the problems of difficulty in meeting different system performance requirements, lack of flexibility of companding curves, and decline in peak-to-average ratio PAPR performance
Inactive Publication Date: 2014-04-16
XIDIAN UNIV
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Tao Jiang proposed the exponential companding method in "Exponential Companding Technique for PAPR Reduction in OFDM Systems". The basic idea is to transform the amplitude distribution of the original OFDM signal into a uniform distribution. However, this method will make the small amplitude signal and large amplitude The distribution of the signal increases, which leads to a decrease in the performance of the peak-to-average ratio PAPR and the bit error rate BER; for this reason, Jun Hou proposed a segmented companding method in "Peak-to-Average Power Ratio Reduction of OFDM Signals With Nonlinear Companding Scheme" , the basic idea is to make the small signal amplitude after companding obey the Rayleigh distribution, and the large signal amplitude obey the uniform distribution. Although this method can effectively reduce the signal peak-to-average ratio PAPR, and the system bit error rate BER is also low, but its compression The form of the expansion curve lacks flexibility, and it is difficult to meet the performance requirements of different systems; for this reason, Shiann-Shiun Jeng proposed the trapezoidal companding method in "Effìcient PAPR Reduction in OFDM Systems Based on a Companding Technique With Trapezium Distribution", the basic idea of which is It is to convert the amplitude distribution of the original OFDM signal into a trapezoidal distribution, but this method will increase the distribution of small amplitude signals, resulting in a decrease in the peak-to-average ratio PAPR performance
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[0035] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
[0036] refer to figure 1 , the specific implementation steps of the present invention are as follows:
[0037] Step 1: Perform OFDM modulation on the input bit stream, and then obtain the original OFDM signal x after upsampling n , where n=0,1,...,JN-1, J represents the upsampling factor, and N represents the number of subcarriers included in the OFDM system.
[0038] Step 2: Construct the companding function.
[0039] 2.1) Define the probability density function f(|z|) of the output signal amplitude |z| of the companding function:
[0040] f ( | ...
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The invention discloses a mixed distribution optimization-based orthogonal frequency division multiplexing (OFDM) signal peak-to-average power ratio suppression method, and mainly aims to solve the problems of low compromising efficiency between peak-to-average power ratio suppression and bit error rate performance and inflexibility of a companding curve form in the prior art. The method is implemented by the following steps of: (1) performing OFDM modulation on an input bit stream, and performing up-sampling to obtain an original OFDM signal; (2) constructing a companding function on the basis of a mixed distribution optimization object; (3) performing companding transformation on the original OFDM signal, and transmitting the companding-transformed signal; (4) calculating a de-companding function, and performing de-companding transformation on the received signal; and (5) performing down-sampling on the de-companding-transformed signal, and performing OFDM demodulation to recover the original bit stream. The peak-to-average power ratio suppression and bit error rate performance can be well compromised, and different system performance values can be obtained by rationally regulating parameters, so that a wireless OFDM system can be flexibly designed, and the method can be widely applied to various new-generation broadband wireless OFDM communication systems.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, relates to a peak-to-average ratio (PAPR) suppressing method of orthogonal frequency division multiplexing OFDM modulated wireless transmission signals, and can be widely applied to various new-generation broadband OFDM wireless communication systems. Background technique [0002] Orthogonal frequency division multiplexing OFDM modulation is a multi-carrier modulation technology, because the sub-carriers are orthogonal, it can significantly reduce the intersymbol interference of the system. Compared with single carrier modulation, its spectral efficiency is higher. In addition, OFDM can better resist multipath channels by inserting guard intervals. Due to these advantages, OFDM modulation has been widely used in wireless communication systems. [0003] However, there are still some shortcomings in the OFDM system that have not been resolved. One of the most important issues is t...
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IPC IPC(8): H04L27/26
Inventor 王勇王丽花葛建华李毅宫丰奎李靖杨超
Owner XIDIAN UNIV