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Orthogonal frequency-division multiplexing system and selective mapping transmitting and receiving method

An orthogonal frequency division and selectivity technology, applied in the field of OFDM communication systems, can solve problems affecting the correct judgment of the auxiliary phase sequence, system transmission efficiency decline, system performance degradation, etc., to enhance the ability to resist channel and random noise interference, The effect of improving the ability to correctly receive and judge auxiliary information and enhancing the ability to resist interference

Inactive Publication Date: 2006-12-27
BEIJING NORTHEN FIBERHOME TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0029] (1) A certain amount of resources are wasted for transmitting auxiliary information, resulting in a decrease in system transmission efficiency
Moreover, as the selection range of the phase-assisted sequence of the transmitter increases, the waste of resources becomes more significant, and the transmission efficiency of the system is greatly reduced.
[0030] (2) Through channel transmission, noise interference, and the transmission of auxiliary information have the same error effects as data information, and the acquisition of auxiliary information has not passed special coding and anti-interference measures, resulting in considerable problems in the correct acquisition of auxiliary information. High probability of error, which seriously affects the correct judgment of the auxiliary phase sequence, resulting in a serious decline in system performance

Method used

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  • Orthogonal frequency-division multiplexing system and selective mapping transmitting and receiving method
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  • Orthogonal frequency-division multiplexing system and selective mapping transmitting and receiving method

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Embodiment Construction

[0043] Through the analysis of the published patent (the patent application number is 03816132.X), the present invention designs a more effective method to overcome the defects of the patent, which is used to transmit the auxiliary information of the SLM transmitter, which not only greatly improves the system transmission Efficiency, and enhanced system anti-interference ability, thereby improving the performance of OFDM system.

[0044] SLM transmitter block diagram of the present invention is as Figure 4 , the block diagram of the receiver is shown in Figure 5 As shown, its data flow and algorithm principle are as follows:

[0045] After encoding and interleaving, the data enters the constellation mapping table for mapping and then outputs the complex sequence; the complex sequence flow enters the serial-to-parallel converter, and the data flow is transformed from serial to corresponding parallel data flow; then the parallel data flow enters the distributor, The parallel...

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Abstract

The invention provides an OFDM system and selective mapping transmission and receiving method, wherein it uses N-point correlator assisted search information to enhance system anti-noise capacity, conjugate multiplies and sums to let frequency attenuation only affect part sequence value of the correlator, and can decide the phase deflection value correctly. This invention makes proper use of IFFT point number to improve system performance, such as reducing PAPR.

Description

technical field [0001] The present invention relates to OFDM (orthogonal frequency division multiplexing) communication system, more specifically, relate to a kind of selective mapping (SLM) in the orthogonal frequency division multiplexing communication system (SLM) to send and receive data so as to reduce the peak average of OFDM system Power Ratio (PAPR) method. Background technique [0002] Among the current various transmission technologies, OFDM technology has received considerable attention, because it uses parallel transmission of data on subcarriers with overlapping frequency spectrums, which greatly improves the spectral efficiency and significantly increases the data transmission rate. . In OFDM technology, modulation is performed by IFFT (Inverse Fast Fourier Transform) and demodulation is performed by FFT (Inverse Fast Fourier Transform). [0003] The operations of the transmitter and receiver in the OFDM wireless communication system will be briefly described...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 吴永东胡建武余建国
Owner BEIJING NORTHEN FIBERHOME TECH CO LTD
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