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Method for reducing PAPR of OFDM system through improved SLM algorithm

An improved, algorithmic technology, applied in the direction of multi-frequency code system, etc., can solve the problem of high bit error rate of SLM algorithm system, and achieve the effect of reliable communication and improved bit error rate

Inactive Publication Date: 2014-09-24
HARBIN INST OF TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The present invention is to solve the problem of high bit error rate in the existing sideband transmission SLM algorithm system, and provides a method for improving the SLM algorithm to reduce the PAPR of the OFDM system

Method used

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  • Method for reducing PAPR of OFDM system through improved SLM algorithm
  • Method for reducing PAPR of OFDM system through improved SLM algorithm
  • Method for reducing PAPR of OFDM system through improved SLM algorithm

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specific Embodiment approach 1

[0044]Specific embodiment one: a kind of improved SLM algorithm of this embodiment reduces the method for OFDM system PAPR to realize according to the following steps:

[0045] Step 1, the transmitter determines the frequency-domain data vector of the OFDM signal in the improved SLM algorithm according to the number of OFDM system subcarriers, expressed as X=[X 1 ,X 2 ,...,X N ] T , where N represents the number of subcarriers, and T represents the transposition of the matrix;

[0046] Step 2, using the improved SLM algorithm to process the frequency-domain data vector X of the input OFDM signal:

[0047] The improved SLM algorithm is the frequency domain data vector X=[X of the OFDM signal input by the transmitting end 1 ,X 2 ,...,X N ] T A random phase shift vector A of length N with D (d) Weighted with the balanced Gold sequence after the amplitude setting of the D channel to obtain the mutually independent output vector S of the D channel (d) ; where S (d) is the...

specific Embodiment approach 2

[0057] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is: the generation cycle of the r-stage shift register is N=2 r Balanced Gold sequence of -1, since N=2 r -1 is an odd number, and the number of subcarriers in the OFDM system is generally an even number. In order to ensure that the period of the balanced Gold sequence is equal to the number of OFDM subcarriers, a zero is added at the end of the balanced Gold sequence, and then the "1" position in the sequence is placed Set the elements at the "0" position to a constant P greater than 1, and set the element at the "0" position to a constant Q less than 1. The balanced Gold sequence after setting is multiplied by the phase point of the previously generated random phase shift sequence. The balanced Gold sequence after the value is set.

[0058] In the method described herein, the balanced Gold sequence is obtained by the bit-by-bit modulo sum of two m-se...

specific Embodiment approach 3

[0061] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the selection of P and Q in the step 6 is the same as the P and Q used for setting at the sending end.

[0062] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a method for reducing the PAPR of an OFDM system through an improved SLM algorithm and relates to an OFDM technology. The method for reducing the PAPR of the OFDM system through the improved SLM algorithm aims to solve the problem that the system error rate of an existing non-sideband transmission SLM algorithm is high, and includes the first step of determining a frequency domain data vector of an OFDM signal, the second step of processing the input vector X through the improved SLM algorithm, the third step of carrying out IFFT on obtained D paths of independent output vectors S(d) to obtain D paths of time-domain signals, the fourth step of selecting and sending the path of signal with the minimum PAPR value, the fifth step of carrying out FFT on the received D paths of signals by a receiving end, the sixth step of carrying out module picking on the obtained D paths of signals after FFT, the seventh step of estimating out which path of signal is emitted by an emitting end and the eighth step of recovering original signal information. The method is applied to the field of wireless communications.

Description

technical field [0001] The present invention relates to Orthogonal Frequency Division Multiplexing (OFDM) technology, in particular to the use of balanced Gold sequences and selective mapping algorithms (SLM) to jointly reduce the peak-to-average power ratio (PAPR) of OFDM systems, and then apply OFDM technology to high-speed modulation and transmission in wireless communication. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a wireless multi-carrier transmission technology. It has become one of the key technologies of wireless communication by virtue of its high spectrum utilization and effective resistance to multipath fading. However, the superposition of in-phase signals output by multiple sub-channels in the OFDM system will produce a large instantaneous peak value, and the sharp change characteristics of this signal envelope can be measured by peak power ratio (PAPR). [0003] In practical application, the modulation of parallel sub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 苏雁泳刘茂才薛栋陈健飞
Owner HARBIN INST OF TECH
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