Signal processing method and device

A signal processing and signal transmission technology, applied in the field of communication, can solve the problem of high peak-to-average ratio PAPR, achieve the effect of reducing PAPR, reducing terminal cost, and saving terminal energy consumption

Active Publication Date: 2017-08-11
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a signal processing method and device to at least solve the problem in the related art that the peak-to-average ratio PAPR is too high when sending signals

Method used

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Embodiment 11

[0108] In this embodiment, the NB-IoT terminal sends uplink data through the NB-PUSCH. The terminal repeatedly sends a transport block at the OFDM symbol level, repeating R=3 times in total, and the modulation mode is QPSK. The modulation method of the pilot frequency is also QPSK. In this embodiment, Nsym=12, Ns=12, repeat 3 times to occupy Nsym*Ns*R=432 OFDM symbols in total. 432 OFDM symbols are divided into Nsym*Ns=144 groups. image 3 is a schematic illustration of OFDM symbols according to this embodiment Figure 1 ,Such as image 3 as shown, image 3 Only 14 OFDM symbols in two slots in one subframe are drawn, in which the pilot occupies the fourth symbol of the two slots, and the other symbols are data carrying information. Data 1 / 2 / 3 / 4 are 4 groups out of 144 groups, and there are 3 copies of OFDM symbols in each group. The data 1 / 3 adopts the QPSK constellation diagram Con1 specified in the Rel-12 version LTE protocol 36.211, and the data 2 / 4 adopts the constel...

Embodiment 12

[0111] In this embodiment, the NB-IoT terminal sends uplink data through the NB-PUSCH. The terminal repeatedly sends a transport block at the subframe level, for a total of R=3 times, and the modulation mode is QPSK. The modulation method of the pilot frequency is also QPSK. In this embodiment, Ns=12, repeating 3 times occupies a total of Ns*R=36 subframes. 36 OFDM symbols are divided into Ns groups. Each group has R subframes. Figure 4 is a schematic diagram of a subframe according to an embodiment of the present invention, Figure 4 There are 10 subframes in one radio frame. Such as Figure 4 As shown, the data 1 / 2 / 3 / 4 are 4 groups in Ns=12 groups, each subframe in each group has 3 copies, and 3 copies are a repeating unit. The same OFDM symbol position in each group of 3 subframes carries the same data and has the same constellation diagram version. While the constellation diagram version of the last OFDM symbol in subframe 3 and the first OFDM symbol in subframe 4 ...

Embodiment 13

[0114] In this embodiment, the NB-IoT terminal sends uplink data through the NB-PUSCH. Figure 5 is a schematic diagram of a TTI bearer according to an embodiment of the present invention, such as Figure 5 As shown, the terminal repeatedly sends a transport block at the TTI level for a total of R=3 times, and the modulation mode is QPSK. The modulation method of the pilot frequency is also QPSK. In this embodiment, OFDM symbols carrying the same data in three TTIs have the same constellation diagram version.

[0115] In this embodiment, when performing data processing on the sending side, the terminal generates modulation symbols of one copy of one transport block through coding and modulation, and these modulation symbols are mapped to Ns*Nsym OFDM symbols. The terminal makes data carrying information on adjacent OFDM symbols have different constellation diagram versions. Then the terminal maps the copy to Ns*Nsym*R OFDM symbols according to certain rules to obtain R copi...

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Abstract

The invention provides a signal processing method and device. The method comprises the following steps: selecting a specified constellation diagram version according to parameter information of a transmission signal, obtaining a first phase rotation angle corresponding to the specified constellation diagram version, selecting a second phase rotation angle according to preset information, and performing phase rotation for time domain symbols or frequency domain symbols of the transmission signal based on the first phase rotation angle and / or the second phase rotation angle, wherein the parameter information includes one or more of the following parameters: data types, modulation modes, time domain granularity of data duplication, constellation diagram versions of signaling configuration, and predefined constellation diagram versions. According to the signal processing method and device provided by the invention, the peak to average power ratio (PAPR) of the transmission signal can be effectively reduced, the problem of too high PAPR during signal transmission in related technologies can be solved, and thus the power amplifier efficiency of a transmitting terminal can be increased, the power consumption of the terminal can be saved, and the effects of reducing the terminal cost and ensuring the signal coverage of the system can be achieved.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a signal processing method and device. Background technique [0002] The peak-to-average ratio (PAR: peak-to-average ratio), also known as the peak-to-average power ratio (PAPR: peak–to–average powerratio), is the ratio of the peak power to the average power of the signal. The peak-to-average ratio of the transmitted signal should be kept at a relatively low level. This is because an excessively high peak-to-average ratio may cause the power amplifier to work in a non-linear region, thereby causing signal distortion and out-of-band leakage. In order to solve this problem, the transmitter usually adopts a power back-off method. That is, let the power amplifier of the transmitter work at an average power output level much lower than the peak power. Although the power backoff can avoid signal distortion, it will reduce the efficiency of the power amplifier, resulting in waste o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2615H04L27/262H04L27/2621
Inventor 陈泽为徐俊许进戴博
Owner ZTE CORP
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