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Pilot frequency sequence reference signal sending and receiving method and device

A technology of reference signal and pilot sequence, applied in pilot signal allocation, channel estimation, multi-frequency code system, etc. The effect of robustness

Active Publication Date: 2016-11-23
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the modulation waveform based on CP-OFDM can well support the mobile broadband (MBB) service requirements in the 4G era, but because 5G will face more challenging and richer scenarios, this makes CP-OFDM in 5G scenarios There are great limitations or deficiencies, mainly in: (1) Adding CP to resist ISI in 5G low-latency transmission scenarios will greatly reduce spectrum utilization, because low-latency transmission will greatly shorten OFDM The length of the symbol, and the length of the CP is only subject to the impulse response of the channel, then the ratio of the length of the CP to the length of the OFDM symbol will be greatly increased. Such overhead causes a very large loss of spectral efficiency, which is unacceptable
(2) Strict time synchronization requirements will cause a lot of signaling overhead required for closed-loop synchronization maintenance in 5G IoT scenarios, and the strict synchronization mechanism makes the data frame structure inelastic, which cannot well support multiple services Different Synchronization Requirements
(3) OFDM uses rectangular pulse shaping (Rectangular Pulse) to make its sidelobe roll-off in the frequency domain very slow, resulting in a large out-of-band leakage
Carriers in this modulation mode only have a real-number domain orthogonal relationship rather than a purely orthogonal relationship, which means that the reference signal will be interfered by symbols on adjacent carriers, and these interferences cannot be detected before equalization at the receiving end Effective elimination
This kind of interference brings great challenges to the design of the reference signal, because unless there is a special design, the reference signal will be strongly interfered and the performance of the channel estimation at the receiving end will be greatly reduced, so that the signal cannot be effectively analyzed. equalization, resulting in a very high bit error rate

Method used

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  • Pilot frequency sequence reference signal sending and receiving method and device
  • Pilot frequency sequence reference signal sending and receiving method and device
  • Pilot frequency sequence reference signal sending and receiving method and device

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Embodiment 1

[0059] In this embodiment, a design of a specific reference signal structure is given, but the design method is also applicable to other reference signal structures.

[0060] Figure 4 An exemplary structure of a reference signal according to Embodiment 1 of the present application is shown. exist Figure 4 In , a schematic diagram of multiplexing the main pilot sequence, auxiliary pilot sequence and data signal in one data block is given. From Figure 4 It can be seen that the auxiliary pilot sequence has an asymmetric structure with respect to the main pilot sequence.

[0061] In many embodiments of the present application, a commonly used ZC (Zadoff-Chu) sequence is used as a predefined pilot sequence reference signal, that is, a target reference signal or a target pilot sequence. The ZC sequence has a variety of unique characteristics, such as better autocorrelation and cross-correlation characteristics, low PAPR (Peak to average power ratio, peak power and average pow...

Embodiment 2

[0095] In this embodiment, a different auxiliary pilot sequence structure is provided, wherein the auxiliary pilot sequence has a symmetrical structure with respect to the main pilot sequence.

[0096] In Embodiment 1, the calculation of the auxiliary pilot sequence needs to be completed through a matrix operation (formula (12)). Although the inverse operation of the matrix can be operated offline, the operation of matrix multiplication still requires a certain complexity. In this embodiment, a new pilot sequence structure is given to reduce complexity.

[0097] Figure 7 A schematic structural diagram of the main pilot sequence and the auxiliary pilot sequence according to Embodiment 2 of the present application is schematically shown. Such as Figure 7 As shown, the auxiliary pilot sequence has a symmetrical structure with respect to the main pilot sequence. In this structure, the main pilot sequence is flanked by auxiliary pilot sequences.

[0098] In some implementatio...

Embodiment 3

[0104] In this embodiment, the same auxiliary pilot sequence structure as that in the second embodiment is provided, the difference is that the auxiliary pilot sequence and the data signal are sent together on the same resource.

[0105] In the second embodiment, the symmetrical auxiliary pilot sequence structure can allow simple auxiliary pilot sequence generation. However, compared to Example 1 Figure 4 Structure, Figure 7 The structure in uses two columns of auxiliary pilot sequences. That is to say, the symmetric pilot sequence structure requires more subcarrier resources for generating the main pilot sequence. Obviously consuming more subcarrier resources means lower spectrum efficiency. In this embodiment, an improved method is given. This method can reduce the resource overhead brought by the auxiliary pilot through the method of data loading, thereby improving spectrum utilization efficiency.

[0106] Figure 8 A schematic structural diagram of a main pilot seq...

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Abstract

The invention discloses a pilot frequency sequence reference signal sending and receiving method and device. The pilot frequency sequence reference signal sending method comprises the steps of generating a primary pilot frequency; generating a secondary pilot frequency sequence, wherein a composite signal of the primary pilot frequency and the secondary pilot frequency on a predetermined resource is equal to a predetermined pilot sequence reference signal; and sending the primary pilot frequency and the secondary pilot frequency by using a filter bank based multicarrier modulation mode. According to the embodiment of the invention, as the primary pilot frequency and the secondary pilot frequency are designed reasonably, the composite signal on the predetermined resource is equal to the predetermined pilot sequence reference signal. Therefore, a receiving end can modulate inherent interference by utilizing FBMC to obtain a predetermined reference signal, and efficient channel estimation can be accordingly carried out.

Description

technical field [0001] The present application relates to the technical field of wireless communication, and in particular to a method and device for transmitting and receiving pilot sequence reference signals based on filter bank multi-carrier modulation. Background technique [0002] With the rapid development of the information industry, especially the growing demand from the mobile Internet and the Internet of Things (IoT, internet of things), unprecedented challenges are brought to future mobile communication technologies. For example, according to the report ITU-R M.[IMT.BEYOND2020.TRAFFIC] of the International Telecommunication Union ITU, it can be predicted that by 2020, the growth of mobile traffic will increase by nearly 1,000 times compared to 2010 (4G era), and the number of user equipment connections will also increase. More than 17 billion. As a large number of IoT devices gradually penetrate into the mobile communication network, the number of connected devic...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2675H04L27/2688H04L27/2613H04L27/26416H04L25/0202H04L5/0048H04L27/2698
Inventor 孙鹏飞喻斌朱大琳
Owner BEIJING SAMSUNG TELECOM R&D CENT
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