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Method for decreasing OFDM signal peak average rate

A signal peak-to-average ratio and amplitude limiting technology, applied in the field of OFDM, can solve the problems of reducing the peak-to-average ratio of OFDM signals, the adverse effects of channel estimation, and large in-band noise, so as to reduce the peak-to-average ratio, reduce adverse effects, and improve accuracy. sexual effect

Inactive Publication Date: 2012-05-30
GCI SCI & TECH
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Problems solved by technology

[0020] The present invention provides a method for reducing the peak-to-average ratio of OFDM signals, so as to solve the problems in the prior art that the peak-to-average ratio is reduced, which brings about large in-band noise and adverse effects on channel estimation.

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  • Method for decreasing OFDM signal peak average rate
  • Method for decreasing OFDM signal peak average rate
  • Method for decreasing OFDM signal peak average rate

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Embodiment Construction

[0066] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0067] Such as figure 2 Shown is the system block diagram of the present invention. The invention converts the limited OFDM data into frequency domain data through FFT, and classifies the OFDM frequency domain data.

[0068] Firstly, classify OFDM subcarriers in the frequency domain: data subcarriers (Data Subcarriers), empty subcarriers (Null Subcarriers) and pilot subcarriers (Pilot Subcarriers). Taking the 256-point OFDM system as an example, there are 28 low-frequency spare subcarriers and 27 high-frequency spare subcarriers. The spare subcarrier indexes are: -128, -127...-101, 101, 102... ..127. The pilot subcarriers are -88, -63, -38, -13, 18, 38, 63, 88. Others are data subcarriers, distributed as image 3 shown. In addition, the out-of-band sub-carriers are obtained by padding zero before IFFT and performing over-sampli...

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Abstract

The invention relates to OFDM field, particularly relates to a method for decreasing an OFDM signal peak average rate. The method comprises the steps of cutting ridge, transforming time-domain to frequency-domain, correcting and transforming frequency-domain to time-domain, wherein the step of correcting comprises the steps of: (11) separating a data sub-carrying data, a pilot sub-carrying data and an unoccupied sub-carrying data from a limited frequency-domain data, (12) correcting the data sub-carrying data according to a system EVM restriction, (13) repositioning the pilot sub-carrying data into a data before being limited, and (14) correcting the unoccupied sub-carrying data according to a frequency spectrum template of system. The technical scheme of the invention corrects different sub-carrying data in different ways by respectively correcting the data sub-carrying data, the pilot sub-carrying data and the unoccupied sub-carrying data. The signal peak average rate is decreased and various harmful effects caused by cutting bridge are also decreased.

Description

technical field [0001] The invention relates to the field of OFDM, in particular to a method for reducing the peak-to-average ratio of OFDM signals. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a special multi-carrier (Multi-Carriers Modulation, MCM) transmission scheme, which is not only a modulation technique, but also a multiplexing technique. It has many advantages unmatched by other wireless communication technologies. At the same time, it is also a parallel technology, which divides a high-speed data stream into many low-speed data streams, and modulates them onto several mutually orthogonal sub-carriers to realize high-speed data transmission. Since the modulation signal rate of each subcarrier is low, the period of the symbol is relatively long, so it has strong resistance to delay extension, and each symbol uses a cyclic prefix (Cyclic Prefix, CP) As a guard interval, the impact of inter-symbol interference is significantly re...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 陈立俊张永强
Owner GCI SCI & TECH