A pre-coding method for combined inhibition of OFDMA system frequency spectrum sidelobe and peak-to-average ratio
A joint suppression and precoding technology, which is applied in the transmission system, multi-carrier system, radio transmission system, etc., can solve problems such as spectrum sidelobe regeneration, interference with adjacent channels, and signal nonlinear distortion, so as to achieve simple description and reduce interference , the effect of small computational complexity
Inactive Publication Date: 2019-05-21
ARMY ENG UNIV OF PLA
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[0003] OFDMA is a multiple access technology based on OFDM. OFDMA technology inherits the advantages of OFDM technology against complex time-varying channel fading, but also inherits two inherent shortcomings of OFDM technology: spectrum out-of-band (OOB, Out-of- band) side lobe (out-of-band power radiation) large and peak-to-average power ratio (PAPR, Peak-to-Average-Power-Ratio) high
Research only solves the OOB (or PAPR) problem and ignores the PAPR (OOB) problem, the PAPR (OOB) problem will still exist, or even worse; only study the PAPR problem, the OOB problem will interfere with adjacent channels; only study the OOB problem, the PAPR problem It will cause the signal to exceed the linear amplification range of the power amplifier, resulting in nonlinear distortion of the signal and spectral sidelobe regeneration; therefore, it is necessary to study the joint suppression of OOB and PAPR
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[0011] The invention aims at the two shortcomings of the OFDMA system: large spectrum side lobe and high peak-to-average power ratio, and models the method of jointly suppressing the two as a multi-objective optimization problem. The multi-objective optimization problem of spectral sidelobe and peak-to-average power ratio is difficult to solve or there is no optimal solution that satisfies multiple objectives at the same time. Therefore, firstly, precoding is designed to suppress spectral sidelobe, and the design method of precoding is given; Then, under the condition of keeping the performance of precoding to suppress the spectral sidelobe unchanged, the column cycle and column exchange algorithm are used to find the precoding matrix that reduces the peak-to-average power ratio, so as to realize the joint suppression of the spectral sidelobe and peak value of the OFDMA system by using precoding average power ratio.
[0012] A kind of precoding method of jointly suppressing OF...
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The invention discloses a precoding method for jointly suppressing frequency spectrum sidelobe and peak-to-average ratio of an OFDMA system. According to the method, correlation of input data of a transmitting end of an OFDMA system is changed through matrix multiplication; The method comprises the following steps of: modeling a frequency spectrum sidelobe and a peak average power ratio of the OFDMA system; A multi-objective optimization model is established, a design principle that the power is not changed and the data error rate is not changed before and after precoding is followed, and an optimal precoding column vector combination is searched through a column circulation and column exchange algorithm, so that the multi-objective optimization problem is solved, and meanwhile, the spectrum sidelobe and the peak-to-average ratio are effectively reduced.
Description
technical field [0001] The invention belongs to the field of wireless communication, in particular, it is a precoding method for joint suppression of OFDMA system spectrum side lobe and peak-to-average power ratio. Background technique [0002] The multi-carrier communication system converts the high-speed serial data stream into multiple low-bit-rate parallel sub-data streams through serial and parallel, thus forming a multi-carrier communication system with multiple parallel low-rate symbols. Compared with the traditional single-carrier communication system, only There will be a small number of sub-channel signals affected by fading, so it can effectively resist frequency selective fading. OFDM is a multi-carrier modulation technology that can effectively combat frequency-selective fading, and each sub-carrier is orthogonal to each other, and the carriers overlap each other without interfering with each other, thereby saving spectrum bandwidth and maximizing the utilizatio...
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Login to View More IPC IPC(8): H04B7/0456H04L27/34
CPCY02D30/70
Inventor 徐任晖王萌彭来献王雷赵文栋徐正芹
Owner ARMY ENG UNIV OF PLA