CN115865582A - 5G NR-oriented inter-carrier interference elimination method - Google Patents
5G NR-oriented inter-carrier interference elimination method Download PDFInfo
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Abstract
The invention belongs to the technical field of anti-interference, and particularly relates to a 5G NR (noise reduction) oriented inter-carrier interference elimination method. On the basis of a traditional OFDM-based 5G NR system, firstly, a bit stream is modulated into a data symbol, then, the ICI elimination modulation based on frequency domain symbol arrangement is simply carried out, and the obtained transmission frequency domain symbol is transmitted into a channel after passing through a standard signal processing flow of a 5G NR transmitting terminal; ICI cancellation modulation is to insert a data symbol into every other sub-carrier on the sub-carriers, and arrange the negative values of the data symbol on the sub-carriers after each data symbol. And at a receiving end, obtaining a receiving frequency domain symbol through a 5G NR receiving end standard signal processing flow, then carrying out ICI elimination demodulation based on frequency domain symbol subtraction, and finally demodulating the obtained data symbol to obtain a communication receiving bit stream.
Description
Technical Field
The invention belongs to the technical field of anti-interference, and particularly relates to a 5G NR (noise-and-noise ratio) -oriented inter-carrier interference elimination method.
Background
With the development of Radio technology, mobile communication technology which has been commercialized in a large scale has evolved to the fifth generation, and the latest 5G NR (New Radio, new air interface) standard device has the characteristics of high speed, ubiquitous network, low power consumption, low delay and the like. With the modernization and informatization construction of the army, the requirement on anti-interference communication networking of a battlefield is increasingly urgent. And the adoption of the 5G NR technology which is verified by massive operation terminals to realize the battlefield communication networking is one of the most cost-effective choices. In the case of a battlefield high-speed moving scene, the standard 5G NR equipment cannot effectively resist high Doppler frequency offset, so that the communication function cannot be effectively realized.
Although the OFDM-based 5G NR communication system can complete high-data-rate communication among multiple terminals, the information transmission cannot be effectively completed under the condition of high Doppler frequency offset.
Disclosure of Invention
In order to solve the above problems, the present invention provides a 5G NR-oriented method for eliminating inter-carrier interference. Under the ICI elimination method based on spectrum symbol arrangement (Inter-Carrier Interference), on the premise of adopting a standard signal processing flow of a 5G NR transmitting end and a receiving end, the communication function can be completed under the condition of high Doppler frequency offset only by adding frequency domain symbol level operation.
The technical scheme adopted by the invention is that a schematic diagram of an ICI elimination scheme based on frequency domain symbol arrangement is shown in figure 1, and a structure diagram of a 5G NR system adopting the ICI elimination method based on the frequency domain symbol arrangement is shown in figure 2:
data processing of a sending end:
a1, setting the number of subcarriers as N, modulating the transmission bit stream into data symbols
The modulation mode is QAM (Quadra)Future Amplitude Modulation) or PSK (Phase Shift Keying);
a2, performing ICI elimination modulation on the N/2 data symbols, namely arranging the data symbols according to the following mode to obtain frequency domain symbols:
[X[0],X[1],...,X[N-1]]＝[X s [0],-X s [0],X s [1],-X s [1],...,X s [N/2-1],-X s [N/2-1]]；
a3, frequency domain symbol obtained
After the standard signal processing flow of the 5G NR sending end, the signal is sent to a channel through a sending antenna, and then the sending end signal sending is finished;
data processing at a receiving end:
b1, obtaining a receiving frequency domain symbol through the processing of a receiving antenna and a 5G NR receiving end signal standard signal processing flow
b2, ICI elimination demodulation is carried out on the received frequency domain symbol to obtain a received data symbol:
b3, receiving data symbols
And obtaining a receiving bit stream after demodulation.
The beneficial effects of the invention are as follows: by adopting ICI elimination technology, the OFDM-based 5G NR communication system can complete the wireless communication function with high Doppler frequency offset under the condition of adopting standard signal processing flow of a 5G transmitting end and a receiving end.
Drawings
Fig. 1 is a schematic diagram of an ICI cancellation scheme based on frequency domain symbol arrangement.
Fig. 2 is a block diagram of a 5G NR oriented ICI cancellation system.
Fig. 3 is a diagram of the performance of the error rate of a system employing an ICI cancellation scheme.
Detailed Description
The invention provides an ICI elimination method of frequency domain symbol arrangement on a traditional OFDM-based 5G NR system. On the basis of a traditional OFDM-based 5G NR system, firstly modulating a bit stream into data symbols, then carrying out simple ICI elimination modulation based on frequency domain symbol arrangement, and transmitting the obtained transmission frequency domain symbols into a channel after a standard signal processing flow of a 5G NR transmitting terminal; the ICI cancellation modulation is to insert a data symbol into every other sub-carrier on the sub-carriers, and arrange the data symbols in a manner of putting the negative value of the data symbol into the sub-carrier after each data symbol. And at a receiving end, obtaining a receiving frequency domain symbol through a 5G NR receiving end standard signal processing flow, then carrying out ICI elimination demodulation based on frequency domain symbol subtraction, and finally demodulating the obtained data symbol to obtain a communication receiving bit stream. The ICI cancellation demodulation is to subtract the negative data symbol from each received data symbol, and then extract the difference as the received data symbol. The ICI elimination method based on frequency domain symbol arrangement is introduced, and ICI elimination facing to a 5G NR system can be completed only by adding an ICI elimination means based on frequency domain symbol arrangement on the basis of a 5G NR standard signal processing flow.
The method comprises the following steps:
at a sending end, mapping transmission bit stream into data symbols through QAM or PSK modulation, and performing ICI elimination modulation on the data symbols, namely inserting one data symbol on each subcarrier according to even-numbered bits, and arranging the data symbols in a manner of putting negative values of the data symbols on the subcarriers of odd-numbered bits behind each data symbol to obtain transmission frequency domain symbols. And the obtained frequency domain symbol is subjected to a standard signal processing flow of a 5G NR transmitting terminal to finish the transmission of the signal.
At a receiving end, a receiving frequency domain symbol is obtained through a receiving antenna and a 5G NR receiving end standard signal processing flow, ICI elimination demodulation is carried out on the receiving frequency domain symbol according to a mode that an even number symbol is subtracted from a subsequent odd number symbol to obtain a receiving data symbol, QAM or PAM demodulation is carried out to obtain a receiving bit stream, and communication is completed.
ICI elimination modulation method: and putting the data symbol with the length of N/2 into the even-numbered position of the subcarrier with the number of N, and putting the negative value of the adjacent data symbol at the front part of the position into the odd-numbered position of the subcarrier to obtain the transmission frequency domain symbol with the length of N.
ICI elimination demodulation method: and subtracting each data symbol positioned at the even number position in the receiving frequency domain symbols with the length of N from the adjacent negative value data symbol behind the data symbol to obtain the receiving data symbol with the length of N/2.
Assuming 4-QAM modulation, a carrier frequency of 5GHz, a subcarrier spacing Δ f of 15khz, a cp period of 4.7 μ s, and N =3240, f is defined d For Doppler frequency offset,. Epsilon = f d And/deltaf is the normalized channel frequency offset. The communication error rate performance of the OFDM-based 5G NR system under different epsilon conditions is shown in fig. 3. It can be seen from the figure that when the normalized channel frequency offset is the same, the bit error rate performance of the system adopting the ICI cancellation scheme is better than that of the OFDM system not adopting ICI cancellation.
Claims (1)
1. A method for eliminating interference between carriers facing 5G NR is characterized by comprising the following steps:
data processing of a sending end:
a1, setting the number of subcarriers as N, modulating the transmission bit stream into data symbols
a2, performing ICI elimination modulation on the N/2 data symbols, namely arranging the data symbols according to the following mode to obtain frequency domain symbols:
[X[0],X[1],...,X[N-1]]＝[X s [0],-X s [0],X s [1],-X s [1],...,X s [N/2-1],-X s [N/2-1]]；
a3, frequency domain symbol obtained
After signal processing is carried out on a 5G NR sending end, the signal is sent to a channel through a sending antenna;
data processing at the receiving end:
b1, obtaining a receiving frequency domain symbol through signal processing of a receiving antenna and a 5G NR receiving end
b2, ICI elimination demodulation is carried out on the received frequency domain symbol to obtain a received data symbol:
b3, receiving data symbols
And obtaining a receiving bit stream after demodulation. />
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103227768A (en) * | 2013-04-28 | 2013-07-31 | 南京邮电大学 | Application of novel ICI self-eliminating method in OFDM modulation |
| CN104954300A (en) * | 2015-07-16 | 2015-09-30 | 电子科技大学 | Auxiliary pilot-based channel estimation method for filter bank based multicarrier (FBMC) system |
| CN109039967A (en) * | 2018-08-09 | 2018-12-18 | 北京大学 | A kind of solution of the f-OFDM system ISI based on ICI from deleting technique |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103227768A (en) * | 2013-04-28 | 2013-07-31 | 南京邮电大学 | Application of novel ICI self-eliminating method in OFDM modulation |
| CN104954300A (en) * | 2015-07-16 | 2015-09-30 | 电子科技大学 | Auxiliary pilot-based channel estimation method for filter bank based multicarrier (FBMC) system |
| CN109039967A (en) * | 2018-08-09 | 2018-12-18 | 北京大学 | A kind of solution of the f-OFDM system ISI based on ICI from deleting technique |
Non-Patent Citations (1)
| Title |
|---|
| 李萌;王琼;蔡希彪;武兴佩;: ""OFDM系统中联合抑制ICI的算法"", 《计算机工程与应用》, 31 December 2016 (2016-12-31) * |
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