Method for decreasing peak equilibrium ratio and orthogonal frequency division multiplexing system

A technology of orthogonal frequency division and peak-to-average ratio, which is applied in the field of reducing peak-to-average ratio based on orthogonal frequency division multiplexing technology, can solve problems such as high complexity, high algorithm complexity, and increased search times, so as to reduce complexity degree of effect

Inactive Publication Date: 2007-06-20
HUAWEI TECH CO LTD
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Problems solved by technology

[0024] 2. High complexity
As M increases, the number of searches performed by the system increases accordingly, so that

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  • Method for decreasing peak equilibrium ratio and orthogonal frequency division multiplexing system
  • Method for decreasing peak equilibrium ratio and orthogonal frequency division multiplexing system
  • Method for decreasing peak equilibrium ratio and orthogonal frequency division multiplexing system

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Embodiment Construction

[0055] According to the definition of peak-to-average ratio, the larger peak-to-average ratio is caused by the consistency of subcarrier phases. If the appropriate phase relationship can be maintained between each subcarrier, the peak-to-average ratio can be effectively reduced. In the literature proposed by Newman (Newman D J.A n L 1 extremal problem for polynominals.Proc.Amer.Math.Soc., 1965,16:1287~1290.) and the literature proposed by Boyd (Boyd S.Multitone Signals with Low Crest Factor[ J].IEEETrans.Circuits Syst.1986, CAS-33:1018~1022.) pointed out that when the subcarrier phase distribution in multi-carrier conforms to Newman distribution, the OFDM time domain signal after IFFT transformation has the lowest peak-to-average ratio . Therefore, in the information scrambling method for reducing the peak-to-average ratio of multi-carriers provided by the present invention, the transmitting end uses the polynomial of the Newman phase sequence to change the phase distribution ...

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Abstract

This invention relates to a method to reduce the peak-to-average and orthogonal frequency division multisystem with low peak-to-average, the core of the invention is: before anti-Fourier IFFT transform, the transmitter completely removes or retains part of the initial phase of modulated transmit sequence, and add the transfer function; the receiver removes the transfer function obtained after fast Fourier FFT transform in the frequency domain sequences, carry through the initial phase processing to the frequency domain sequences removed the transfer function, then resume to this transmit sequence. The invention only does N times complex multiplication when adding the transfer function, so it can reduce the implementation complexity of the transmitter and receiver under the premise to effectively reduce peak-to-average. In addition, through the use of this method of keeping part initial phase of transmit sequence by multiply initial phase of transmit sequence with phase factor, the source do not need to send any redundant information like side band information, therefore further lower the implementation complexity of transmitter and receiver.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a technology for reducing peak-to-average ratio based on Orthogonal Frequency Division Multiplexing (OFDM) technology. Background technique [0002] With the development of mobile communication services, various multimedia services continue to emerge. OFDM technology has been used in digital audio broadcasting (DAB), digital video broadcasting (DVB), asymmetric digital subscriber line (ADSL), and networks based on IEEE802.11 and 802.16 standards. It has been applied in wireless local area network (WLAN) and has become the main candidate technology of 4G. [0003] OFDM technology is a multi-carrier broadband digital modulation technology. It divides the data stream into several sub-bit streams, so that each sub-data stream has a lower transmission bit rate, and uses these data streams to modulate several orthogonal carrier waves. The data transmission rate of each m...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 孙铭扬
Owner HUAWEI TECH CO LTD
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