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Synchronous signals and signal transmission and reception methods to achieve perfect omnidirectional precoding in large-scale mimo systems

A technology of synchronization signal and transmission method, applied in the directions of synchronization device, transmission system, radio transmission system, etc., can solve problems such as omnidirectional signal transmission performance affecting synchronization performance, linear increase of pilot frequency overhead, and different transmission signal power, etc. Achieve perfect omnidirectional coverage, reduce pilot overhead, and reduce complexity

Active Publication Date: 2019-11-12
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Space-time coded transmission and cyclic delay diversity (CDD) are omnidirectional diversity transmission technologies widely used in LTE and other systems. If they are directly extended to massive MIMO systems, not only the system design is difficult, but also the pilot Application bottleneck problem where overhead increases linearly with the number of base station antennas
In recent years, for the problem of omnidirectional signal transmission in massive MIMO systems, spatial signal extension or precoding methods have been proposed, but they cannot guarantee perfect omnidirectional transmission, and the power of transmitted signals in each spatial direction is different. will affect the synchronization performance and the performance of omni-directional signal transmission

Method used

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  • Synchronous signals and signal transmission and reception methods to achieve perfect omnidirectional precoding in large-scale mimo systems
  • Synchronous signals and signal transmission and reception methods to achieve perfect omnidirectional precoding in large-scale mimo systems
  • Synchronous signals and signal transmission and reception methods to achieve perfect omnidirectional precoding in large-scale mimo systems

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Embodiment 1

[0099] Each column of the perfect omnidirectional precoding matrix W may be composed of each sequence in a set of multiple mutually complementary orthogonal sequences. Consider a set of multi-complementary orthogonal sequences {a 0 ,a 1 ,...,a K-1}, where each sequence a k =[a k,0 ,a k,1 ,...,a k,M-1 ] T are polyphase sequences of length M, polyphase means All K sequences in this set satisfy both the complementary property and the orthogonal property. The complementary property means that the sum of the aperiodic autocorrelation functions of the K sequences is a delta function, that is

[0100]

[0101] And the orthogonality property means that

[0102]

[0103] Then the perfect omnidirectional precoding matrix W is constructed as

[0104] W=[a 0 ,a 1 ,...,a K-1 ] (16)

[0105] When K=2, a typical multi-complementary orthogonal sequence set is a Golay sequence pair.

example 2

[0106] Example 2: You can construct a dimension of The perfect omni-directional precoding matrix W′, which is denoted as

[0107] W'=[w 0 ,w 1 ,...,w K-1 ] (17)

[0108] Then each column of the perfect omnidirectional precoding matrix W with dimension M×K can be obtained by performing K times zero-interpolation on each column of W′ respectively, namely

[0109] W=[P 0 w 0 ,P 1 w 1 ,...,P K-1 w K-1 ] (18)

[0110] In formula (18), P k =[[I M ] ：,k ,[I M ] :,k+K ,...,[I M ] :,k+M-K ] indicates that the dimension is K times zero interpolation matrix, [I M ] :,k It means that taking the k-th column of the M×M identity matrix, interpolation according to formula (18) can ensure that each row of the obtained perfect omnidirectional precoding matrix W has only one non-zero element. Taking K=2, M=64 as an example, the perfect omnidirectional precoding matrix W' with a dimension of 32×2 is recorded as

[0111]

[0112] Then the perfect omni-directional precodi...

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Abstract

The invention discloses a synchronization signal sending method and a receiving method for realizing perfect omnidirectional precoding in a large-scale MIMO system. A base station or a sending device intermittently generates a synchronization signal, and then performs perfect omnidirectional precoding processing on the synchronization signal; The precoded synchronization signal is received by the mobile terminal or the receiving device after passing through the transmission channel, and the mobile terminal or the receiving device uses the received synchronization signal and the local copy of the synchronization signal to perform reception synchronization processing. The present invention also discloses a signal sending method and a receiving method for realizing perfect omnidirectional precoding in a massive MIMO system. A base station or a sending device generates a vector signal through low-dimensional space-time coding, and then performs perfect omnidirectional precoding processing on the vector signal; The transmitted signal processed by the perfect omnidirectional precoding is received by the mobile terminal or the receiving device after passing through the transmission channel, and the mobile terminal or the receiving device uses the received transmitted signal to process the received signal.

Description

technical field [0001] The present invention relates to a wireless communication method, in particular to a synchronous signal and a signal sending and receiving method for realizing perfect omnidirectional precoding in a massive MIMO system. Background technique [0002] In recent years, a MIMO (Massive MIMO) wireless communication system configured with a large number of antennas at the base station has attracted extensive attention from academia and industry. In a massive MIMO system, the base station generally configures more than dozens of antenna units (such as 128 or 256), and serves dozens of users (such as 40) at the same time. A large number of antenna units at the base station can greatly improve the spatial freedom of wireless communication, greatly improve the transmission rate, spectrum efficiency and power efficiency, and eliminate inter-cell interference to a considerable extent. The increase in the number of antennas allows each antenna unit to be made smal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456H04B7/0413
CPCH04B7/0413H04B7/0426H04B7/0456H04W56/00H04B7/1555H04B7/2678
Inventor 高西奇孟鑫
Owner SOUTHEAST UNIV