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LTE system OFDM signal peak-to-average ratio suppression method combining constellation expansion with tone reservation

A technology of reserved sub-carrier and signal peak-to-average ratio, which is applied in modulation carrier system, transmission system, multi-frequency code system, etc., can solve the problem of low efficiency of peak-to-average ratio suppression comprehensive performance, etc.

Active Publication Date: 2015-03-25
XIDIAN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a joint constellation expansion and reserved subcarrier LTE system OFDM signal peak-to-average ratio suppression method, aiming to solve the problem of low efficiency of the peak-to-average ratio suppression comprehensive performance of the existing reserved subcarrier algorithm

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  • LTE system OFDM signal peak-to-average ratio suppression method combining constellation expansion with tone reservation
  • LTE system OFDM signal peak-to-average ratio suppression method combining constellation expansion with tone reservation
  • LTE system OFDM signal peak-to-average ratio suppression method combining constellation expansion with tone reservation

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specific Embodiment

[0102] refer to figure 2 , the implementation steps of the embodiment of the present invention are as follows:

[0103] Step 1: After performing quadrature amplitude modulation and serial-to-parallel conversion on the input signal, randomly select the positions of L reserved subcarriers, assign 0 to the positions of the L reserved subcarriers and assign positive values ​​to the positions of the other N-L data subcarriers. Effective data information in the frequency domain obtained by cross-amplitude modulation to obtain N-point frequency domain signal X r , wherein, N represents the number of subcarriers included in OFDM modulation, L represents the number of reserved subcarriers included in OFDM modulation, r=0,1,...,N-1;

[0104] Step 2: Align the signal Perform upsampling to obtain the original OFDM frequency domain signal X k , wherein, k=0,1,...,JN-1, J represents the upsampling factor, and JN represents the number of subcarriers included in the OFDM system after ups...

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Abstract

The invention discloses an LTE system orthogonal frequency-division multiplexing (OFDM) signal peak-to-average ratio suppression method combining constellation expansion with tone reservation. According to the suppression method, an active constellation expansion intelligent gradient mapping algorithm principle and a tone reservation least square estimation algorithm are combined, and control over the signal peak-to-average ratio performance, the bit error rate performance of a system and the out-of-band frequency spectrum extension performance of transmitting signals is effectively achieved by correcting the position of constellation points. A high convergence speed can be obtained, and the system operation time is effectively optimized, so that it is ensured that under the condition of little influence on the bit error rate performance of the system, the OFDM signal peak-to-average ratio is reduced substantially, and the overall comprehensive performance of the LTE system is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a joint constellation expansion and reserved subcarrier LTE system orthogonal frequency division multiplexing OFDM signal peak-to-average ratio suppression method. Background technique [0002] Orthogonal frequency division multiplexing OFDM modulation is a multi-carrier modulation technology. Because the sub-carriers between symbols are orthogonal to each other, it can significantly reduce the inter-symbol interference of the system; compared with single-carrier modulation, its spectral efficiency is higher; In addition, OFDM modulation techniques can better resist multipath channels by inserting guard intervals. Due to these advantages, OFDM technology has been widely used in wireless communication systems. However, the main disadvantage of OFDM modulation is that its transmitted signal has a peak-to-average ratio PAPR characteristic. When the transm...

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L5/006H04L27/2601H04L27/2614
Inventor 王勇刘芳宫丰奎葛建华
Owner XIDIAN UNIV
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