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Peak to average power ratio restraint method and system

A technology of peak average power and maximum value, applied in the field of communication, can solve problems such as reducing PAPR, achieve the effect of reducing PAPR, reducing transmission volume, and improving reliability

Inactive Publication Date: 2010-07-28
BEIJING NORTHEN FIBERHOME TECH CO LTD
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Problems solved by technology

The advantage of the selective mapping method is that it is not limited by the modulation method and the number of carriers, and no signal distortion will occur, but the ability to reduce PAPR by using SLM alone is also limited.

Method used

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  • Peak to average power ratio restraint method and system
  • Peak to average power ratio restraint method and system

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Embodiment Construction

[0062] On the basis of studying the above various PAPR reduction methods, the present invention proposes a peak-to-average power ratio suppression method, which is suitable for multi-antenna LTE systems, and the ability to reduce PAPR is far better than that of a single SLM method and companding Law.

[0063] In order to facilitate the understanding of those skilled in the art, first briefly introduce the coding principle of the space-time trellis code:

[0064] For the convenience of explanation, with figure 1 The trellis diagram is shown as an example. figure 1 In , 4-state TCM coding and 4PSK constellation symbols are used. Input 2bit each time, use b k a k represents the input at time k, then b k-1 a k-1 Indicates the input bit at time k-1, that is, the bit stored in the register. The output of the trellis code at time k is represented by (x 1 k , x 2 k ) means that Figure 2-2 Pairs of numbers to the right of the trellis in (b). Depend on Figure 2-2 Knowing...

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Abstract

The invention relates to a peak to average power ratio (PAPR) restraint method, comprising the following steps: A. multiplying X1 and X2 by an identical random sequence respectively in a first symbol period to calculate PAPR respectively, recording as PAPR [X1] and PAPR [X2], and selecting a random sequence from a set; B. comparing PAPR [X1] and PAPR [X2] and selecting the maximum value as PAPR (X); C. repeating the steps above, selecting a signal X1* and a signal X2* with minimum PAPR (X), and selecting a corresponding random vector; D. repeating the steps above until the last symbol of the antenna; and E. processing all symbols with a compandor to reduce PAPR again. Based on study of PAPR reduction methods, the invention provides the PAPR restraint method and a system thereof for a multi-antenna LTE system and has much better PAPR reduction capacity than the PAPR reduction capacity of separate SLM method and companding method.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a peak-to-average power ratio suppression method. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) is a special multi-carrier transmission scheme. OFDM can be regarded as a modulation technique, and can also be regarded as a multiplexing technique. OFDM has many advantages that other wireless communication technologies cannot match. One of the main reasons is that OFDM can resist frequency selective fading or narrowband interference very well. At the same time, OFDM is also a parallel technology, which can divide a high-speed data stream into many sub-carriers of low-speed data streams to achieve high-speed transmission at a data rate. [0003] The difference between OFDM and general multi-carrier transmission is that sub-carrier spectrums are allowed to partially overlap. As long as the sub-carri...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L1/06
Inventor 高知余建国
Owner BEIJING NORTHEN FIBERHOME TECH CO LTD
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