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Method for reducing peak-average power ratio based on multi-carrier continuous phase modulation system

A technology of peak-to-average power ratio and modulator, which is applied in the direction of multi-frequency code system, etc., which can solve the problems of nonlinear distortion of the system, reduction of system transmission efficiency, and failure of correct demodulation at the receiving end.

Inactive Publication Date: 2009-06-17
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, due to the existence of multiple orthogonal subcarriers in the OFDM system, its output is the superposition of multiple subcarrier signals. Therefore, when the phases of all signals are consistent, the instantaneous power of the superimposed signal obtained will be much greater than the average signal power, resulting in a high peak-to-average power ratio (PAPR) for OFDM systems
This high PAPR will cause nonlinear distortion of the system and seriously affect the performance of the system, which is one of the biggest shortcomings of the OFDM system
The PTS algorithm is a common algorithm to reduce the peak-to-average power ratio of the OFDM system, but in this algorithm, the sender must inform the receiver of the auxiliary information of each information packet in the PTS algorithm to achieve reliable transmission. If the auxiliary information is wrong during transmission, Then the receiving end will not be able to demodulate correctly
In addition, the transmission of auxiliary information will also reduce the transmission efficiency of the system.

Method used

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  • Method for reducing peak-average power ratio based on multi-carrier continuous phase modulation system
  • Method for reducing peak-average power ratio based on multi-carrier continuous phase modulation system
  • Method for reducing peak-average power ratio based on multi-carrier continuous phase modulation system

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Embodiment Construction

[0012] The number of sub-carrier groupings in the system is defined as V, and the specific implementation of the invention is described for one OFDM symbol. The present invention will be described in detail below by means of the accompanying drawings.

[0013] figure 1 A model diagram of the system used is shown.

[0014] In step 101, for the serial data stream b i (i=1, 2...) perform serial-to-parallel conversion, and the data stream is divided into V groups of parallel branches.

[0015] In step 102, the CPM modulators determine the modulation index, and the selected modulation index for each modulator is passed to the peak-to-average power ratio reduction module. The selection principle of the modulation index is as follows: for 4CPM, when h=2 / 5, 4 / 5, the number of states is 5, and the bit error performance is the best; for 8CPM, when h=2 / 9, 4 / 9, 8 / 9 , the number of states is 9, and the bit error performance is the best. At the same time, the influence of the modulatio...

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Abstract

The invention provides a sub-carrier group CPM (Subcarriers Grouped CPM-SGC) method, which is used to match information groups in PTS algorisms, the value space of auxiliary information of each information group in the PTS algorisms is determined according to modulation indexes of each group in the SGC. The method is characterized in that system PAPR is prominently lowered, simultaneously, the receiving end can demodulate normally without knowing the auxiliary information value in each PTS group, and the system anti-noise performance is not affected.

Description

technical field [0001] The invention relates to the field of wireless communication, and is an effective method for reducing the peak-to-average power ratio (PAPR) of a continuous phase modulation (CPM)-based multi-carrier system (especially suitable for an orthogonal frequency division multiplexing system OFDM). The invention is applicable to both single and multiple antenna systems. Background technique [0002] OFDM technology is a multi-carrier transmission technology in the mobile communication environment. Its biggest feature is to divide the available frequency band into several sub-channels, thereby converting frequency-selective channels into a series of orthogonal flat fading channels. OFDM can effectively combat multipath effects and greatly improve data transmission rate and spectrum utilization. OFDM has been widely used in digital video / audio broadcasting (DVB-T / DAB), wireless local area network (IEEE802.11Serial, Hiper-LAN / 2), digital subscriber line (xDSL) a...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 刘元安谢刚伞亮李行政刘凯明
Owner BEIJING UNIV OF POSTS & TELECOMM
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