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Amplitude limiting method for reducing PAPR in OFDM system on basis of quantification theory

A quantization theory and clipping technology, applied in the direction of multi-frequency code system, etc., can solve the problem of high bit error rate of clipping method, achieve the effect of small nonlinear change, reduce bit error rate, and low computational complexity

Inactive Publication Date: 2014-04-16
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of clipping method that reduces PAPR in the OFDM system based on quantization theory, to solve the problem that bit error rate is too high in the existing clipping method

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  • Amplitude limiting method for reducing PAPR in OFDM system on basis of quantification theory
  • Amplitude limiting method for reducing PAPR in OFDM system on basis of quantification theory
  • Amplitude limiting method for reducing PAPR in OFDM system on basis of quantification theory

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Embodiment Construction

[0034] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0035] Such as figure 1 As shown, a kind of limiting method that the present invention provides reduces PAPR in the OFDM system based on quantization theory, comprises:

[0036] S11: performing multi-carrier modulation on the input signal;

[0037] S12: Determine several quantization clipping sub-intervals;

[0038]S13: Perform quantization and clipping on each multi-carrier modulated input signal according to the quantization and clipping subinterval to which the amplitude of each multi-carrier modulated input signal belongs, to obtain a quantization and clipping information sequence;

[0039] S14: Send the quantized and limited information sequence to the receiving end through the wireless channel, and the receiving end uses this sequence to directly...

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Abstract

The invention provides an amplitude limiting method for reducing a PAPR in an OFDM system on the basis of a quantification theory and relates to the field of orthogonal frequency-division multiplexing communication. The amplitude limiting method is used for solving the problem that an amplitude limiting method at present is too high in error rate. The amplitude limiting method is based on the quantification theory, a principle of the amplitude limiting method is utilized, and a plurality of quantized values are set according to amplitude differences of input signals so as to achieve the goal of amplitude limiting. The method is improved on the basis of a traditional amplitude limiting method, is simple to apply, can effectively reduce the PAPR in the OFDM system and is low in computation complexity. In addition, the quantification theory is applied to the amplitude limiting method; compared with the traditional amplitude limiting method, non-linear variations of signals are smaller, original input signals can be correctly recovered at a receiving end, and the error rate of the OFDM system can be remarkably reduced while PAPR performance reduction is guaranteed.

Description

technical field [0001] The invention relates to the field of Orthogonal Frequency Division Multiplexing (OFDM) communication, in particular to a limiting method for reducing PAPR in an OFDM system based on quantization theory. Background technique [0002] Orthogonal frequency division multiplexing OFDM is a multi-carrier modulation technology. Its basic idea is to distribute high-speed data information streams to several sub-channels with lower transmission rates through serial / parallel conversion. Since the data information to be transmitted is distributed to each subcarrier, the duration of each symbol is greatly increased, making the symbol period of the OFDM signal longer than the multipath delay, so it has a very good ability to resist ISI. In addition, OFDM technology utilizes the time-frequency orthogonality of signals to allow partial overlap of sub-channel spectrum, which nearly doubles the spectrum utilization. Based on these advantages, OFDM technology is widely...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 何振王建萍颜晶刘俊文
Owner UNIV OF SCI & TECH BEIJING
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