Frequency-domain autocorrelation matching system and method for reducing peak-to-average power ratio of OFDM systems
A peak-to-average power ratio and autocorrelation technology, which is applied in multi-frequency code systems, baseband system components, shaping networks in transmitters/receivers, etc., can solve the problem of increasing computational complexity of algorithms and reducing system spectrum utilization efficiency, etc. question
Inactive Publication Date: 2015-08-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0009] The disadvantage of the traditional SLM method is that: in order to obtain better PAPR suppression performance, it is usually necessary to perform IFFT transformation on multiple candidate signals, and select one of them for transmission, the computational complexity of the algorithm increases sharply; and in order to enable the system to receive To restore the original signal at the end, it is necessary to transmit certain sideband side information, and the transmission of sideband side information reduces the spectrum utilization efficiency of the system.
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[0063] figure 2 It is a system frame diagram of a specific embodiment of the frequency domain autocorrelation matching system for reducing the peak-to-average power ratio of the OFDM system according to the present invention. Such as figure 2 As shown, the frequency domain autocorrelation matching system for reducing the peak-to-average power ratio of the OFDM system in the present invention includes three parts: a rotating phase sequence generator, a transmitter and a receiver, wherein:
[0064] Rotation phase sequence generator 201, used to generate M rotation phase sequences P with a length of N m , m=1, 2, .
[0065] Transmitters include:
[0066] A serial / parallel conversion module 202, configured to convert the original serial data stream into a parallel data stream containing N subcarriers.
[0067] The digital modulation module 203 is used to digitally modulate the parallel data streams to obtain the frequency domain sequence S=[S 1 ,S 2 ,...,S N ].
[0068] ...
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The invention discloses a frequency domain self-correlation matching system and method for reducing a PAPR (peak-to-average power ratio) of an OFDM (orthogonal frequency division multiplexing) system. The frequency domain self-correlation matching method comprises the following steps of generating a self-correlation signal of a frequency domain sequence, processing and transmitting the self-correlation signal of a frequency domain according to the traditional SLM (selected mapping) method, carrying out a point multiplication operation on a received signal and M rotation phase sequences in an emitter rotation phase sequence generator to obtain M output signals by a receiver, respectively carrying out the self-correlation operation on the M output signals, enabling a signal with the maximum self-correlation value to pass through a self-correlation signal generator inverse transform module to recover the frequency domain sequence, and carrying out demodulation and parallel / serial conversion to be capable of recovering an original serial dataflow. According to the frequency domain self-correlation matching system and method for reducing the PAPR of the OFDM system, which is disclosed by the invention, information of the rotation phase sequence is implanted into self-correlation of the self-correlation signal of the frequency domain, the original signal is recovered by utilizing the self-correlation of the output signal obtained by the point multiplication of the received signal and the rotation phase sequences, and the transmission of sideband secondary information is omitted.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically relates to a frequency-domain autocorrelation matching system and method for reducing the peak-to-average power ratio of an OFDM system. Background technique [0002] Among the existing communication technologies, OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology has become the mainstay of future mobile multimedia communications due to its high spectrum utilization, good anti-multipath fading and anti-interference performance. One of the candidate technologies. A typical OFDM signal can be represented as follows: [0003] x ( t ) = 1 N Σ n = 0 N - 1 ...
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IPC IPC(8): H04L27/26H04L25/03
Inventor 杨霖贾莹莹王田胡武君李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA