System and method for reducing ofdma uplink peak-to-average power ratio
A peak-to-average power ratio and link technology, which is applied in the transmission system, multi-frequency code system, digital transmission system, etc., can solve the problem of signal PAPR reduction, and achieve the characteristics of reducing PAPR, good resistance, and good resistance to out-of-band radiation Effect
Inactive Publication Date: 2018-09-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0009] Coefficient a of Cassine expression i has the smallest dynamic range, so if the expression of an OFDMA signal frame is expressed as a Cassine expression, the PAPR of the signal will be significantly reduced
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[0044] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.
[0045] Such as figure 1 As shown, the system for reducing the peak-to-average power ratio of the OFDMA uplink includes a zero-padded module, a reserved sub-carrier selection module, and an iterative module. The input signal is connected to the signal input end of the reserved sub-carrier selection module through the zero-padded module, and the reserved sub-carrier The output terminal of the carrier selection module is connected to the iteration module, and the iteration module outputs an output signal;
[0046] The iterative module includes an IFFT transformation module, a limiting module, a Cassin coefficient calculation module, an FFT transformation module, a filtering module, and an accumulation module. The output end of the IFFT transformation module se...
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The invention discloses a system and method for reducing the peak-to-average power ratio of an OFDMA uplink. The input signal is connected to the signal input terminal of the reserved subcarrier selection module through a zero padding module, and the output terminal of the reserved subcarrier selection module is connected to the iteration module. , the iterative module outputs the output signal; the iterative module includes an IFFT transformation module, a clipping module, a Cassine coefficient calculation module, an FFT transformation module, a filtering module and an accumulation module, and the output of the IFFT transformation module passes through the limiting module and the Cassine coefficient calculation in turn module, FFT transformation module and filtering module are connected with the input end of the accumulation module. The present invention constructs the Cassine coefficient through continuous clipping iterations, so that the amplitude of the uplink signal of the OFDMA system has a small dynamic range, thereby reducing the PAPR of the signal of the OFDMA system. By iteratively reconstructing the original signal, the EVM value is limited to a small value, so the PAPR of the OFDMA uplink signal can be effectively reduced, and it has better anti-in-band distortion and anti-out-of-band radiation characteristics.
Description
Technical field [0001] The present invention relates to the field of wireless communication, and in particular to a system and method for reducing the peak-to-average power ratio of OFDMA uplink. Background technique [0002] OFDM technology, as a multi-carrier digital modulation technology, is widely used in wireless communications due to its high spectral efficiency and resistance to inter-symbol interference. In recent years, Orthogonal Frequency Division Multiple Access (OFDMA), as a combination of Orthogonal Frequency Division Multiplexing (OFDM) and Frequency Division Multiple Access (FDMA), has been applied to broadband wireless networks. In OFDMA, FDMA technology is used to combat multiple access interference. In addition, OFDMA is a kind of OFDM system, and many advantages of OFDM system are inherited, such as anti-narrowband interference. [0003] However, the OFDMA system also inherits many shortcomings of the OFDM system. A big shortcoming is its Peak-to-Average-Power...
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IPC IPC(8): H04L27/26
CPCH04L27/2614
Inventor 余淋朱晓东符初生
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA