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Pilot frequency sending method, pilot frequency receiving method and devices thereof

A technology for sending methods and receiving values, applied in the field of pilot sending and receiving methods and devices, capable of solving problems such as multipath fading channel destroying orthogonality characteristics, achieving the effects of excellent channel accuracy and saving time-frequency resources

Active Publication Date: 2016-10-05
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the MIMO-OFDM / OQAM system that only satisfies the orthogonality condition in the real number domain, the complex number characteristics of the multipath fading channel will destroy the orthogonality characteristics of the OFDM / OQAM system, so the signal received by the receiving front end has inter-symbol interference and sub-symbol interference. For inter-carrier interference, it is necessary to design a pilot signal sequence and channel estimation method for MIMO-OFDM / OQAM real-number domain orthogonality characteristics to eliminate inter-symbol interference and inter-subcarrier interference

Method used

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  • Pilot frequency sending method, pilot frequency receiving method and devices thereof
  • Pilot frequency sending method, pilot frequency receiving method and devices thereof
  • Pilot frequency sending method, pilot frequency receiving method and devices thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0122] This embodiment assumes that the MIMO-OFDM / OQAM system is a MIMO system with 2 transmit antenna ports and 2 receive antenna ports, adopts 4QAM modulation, the subcarrier length is N=16, the number of channel taps is L=2, ZCZ The sequence length of the sequence is P=8, the set size is M=2, and the size of the zero-correlation region is Z=2. The two ZCZ sequences with a length of 8 are c 1 ={-1,1,1,-1,1,1,-1,-1} T 、c 2 ={-1,-1,1,1,1,-1,-1,1} T .

[0123] MIMO-OFDM / OQAM system according to Figure 6 ~ Figure 10 Construct the transmission pilot in the way.

[0124] Figure 6 Shown is the ZCZ sequence used by the transmitting antenna port 1 and the transmitting antenna port 2 in this embodiment. expand first Figure 6 The ZCZ sequence in Figure 7 Shown periodic extended ZCZ sequence; then Figure 7 The sequence in is obtained through the FFT module Figure 8 in the sequence; then take out the Figure 8 The real and imaginary parts of the sequence in get Figure...

Embodiment 2

[0127] This embodiment assumes that the MIMO-OFDM / OQAM system is a MIMO system with 4 transmit antenna ports and 4 receive antenna ports, adopts 16QAM modulation, the subcarrier length is N=32, the number of channel taps is L=2, ZCZ The sequence length of the sequence is P=16, the set size is M=4, and the size of the zero-correlation region is Z=2. The four ZCZ sequences of length 8 used are:

[0128] c 1 ={-1,-1,-1,-1,-1,1,-1,1,1,1,-1,-1,1,-1,-1,1} T ,

[0129] c 2 ={-1,1,-1,1,-1,-1,-1,-1,1,-1,-1,1,1,1,-1,-1} T ,

[0130] c 3 ={1,1,-1,-1,1,-1,-1,1,-1,-1,-1,-1,-1,1,-1,1} T ,

[0131] c 4 ={1,-1,-1,1,1,1,-1,-1,-1,1,-1,1,-1,-1,-1,-1} T .

[0132] MIMO-OFDM / OQAM system according to Figure 11 ~ Figure 1 The way in 5 is used to construct the transmission pilot.

[0133] Figure 11 Shown are the ZCZ sequences used by the transmitting antenna port 1 to the transmitting antenna port 4 in this embodiment. expand first Figure 11 The ZCZ sequence in Figure 12 Shown pe...

Embodiment 3

[0136] This embodiment assumes that the system is an OFDM / OQAM system with single transmission and single reception, that is, there is one transmit antenna port and one receive antenna port, 4QAM modulation is used, and the subcarrier length is N=8. At this time, channel estimation in the frequency domain is used method, using Figure 16 pilot structure. The value of the odd position of the auxiliary pilot is placed the same value as the value corresponding to the odd position of the reference data, the value of the even position of the auxiliary pilot is the opposite value of the value corresponding to the even position of the reference data, and the value of the even position of the pilot area is set to zero.

[0137] Figure 17 is a group of examples, where the value of an odd-numbered position in the pilot region is not controlled, so a pilot column with a lower PAPR can be selected so that it still has good performance after passing through a high-power amplifier. Its s...

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Abstract

The invention discloses a pilot frequency sending method applied to an OFDM / OQAM system. The method comprises the steps of respectively conducting the steps of A-C for each transmitting antenna port: A, generating a time domain orthogonal sequence as a pilot frequency; B, expanding the length of the time domain orthogonal sequence to be equal the length of the subcarrier of the OFDM / OQAM system; C, converting the expanded time domain orthogonal sequence into a frequency domain complex sequence; D, respectively mapping the real part and the imaginary part of the frequency domain complex sequence corresponding to each transmitting antenna port onto two pilot frequency regions for transmission. The invention also provides a corresponding pilot frequency receiving method, a pilot frequency sending device and a pilot frequency receiving device. According to the technical scheme of the invention, the channel estimation accuracy of the OFDM / OQAM system is improved. Meanwhile, the time-frequency resource of the OFDM / OQAM system is saved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and more specifically, to a method and device for sending and receiving pilot frequencies used in a system based on a filter bank. Background technique [0002] In the existing communication technology, OFDM / OQAM (Orthogonal Frequency Division Multiplexing / offset Quadrature Amplitude Modulation, Orthogonal Frequency Division Multiple Access technology based on interleaved quadrature amplitude modulation method) system with its high spectrum utilization, good timing Frequency focusing characteristics, become one of the main candidate technologies for future mobile communications, its detailed introduction can be found in Le Floch, M.Alard, and C.Berrou, "Coded Orthogonal Frequency Division Multiplex," Proceedings of the IEEE, vol.83, pp .982–996, June 1995. [0003] The mathematical expression of the baseband transmission signal s(t) of the OFDM / OQAM system is: [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/36H04L27/38
Inventor 胡苏袁航喻斌孙鹏飞付彦路
Owner BEIJING SAMSUNG TELECOM R&D CENT
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