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Wireless communication link adaptive method and uplink and downlink adaptive method

A technology of link self-adaptation and wireless communication, which is applied in the direction of radio transmission system, transmission modification based on link quality, adjustment of transmission mode, etc. It can solve the problems of increased complexity, achieve reduced complexity, low performance loss, and good performance. The effect of robustness

Active Publication Date: 2017-01-18
SOUTHEAST UNIV
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Problems solved by technology

[0004] In a large-scale array antenna communication system, the above adaptive scheme is still available as a whole, but due to the sharp increase in the number of antennas on the base station side and the number of served terminals, it is complicated to use the original method of calculating the equivalent signal-to-noise ratio on resource blocks. Therefore, it is necessary to study and adopt a new adaptive parameter calculation method suitable for large-scale antenna scenarios

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  • Wireless communication link adaptive method and uplink and downlink adaptive method
  • Wireless communication link adaptive method and uplink and downlink adaptive method
  • Wireless communication link adaptive method and uplink and downlink adaptive method

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Embodiment Construction

[0047] The technical solution of the present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0048] This specific embodiment discloses a wireless communication uplink adaptive method, such as figure 1 As shown, assume a Massive MIMO system including a base station with M antennas and K single-antenna terminals. Assuming that both M and K are large, typical values ​​such as M=64, K=32, etc., K single-antenna terminals transmit data to the base station independently, and receive data from K terminals at the base station side at the same time:

[0049] y = Σ k = 1 K h k x k + n - - - ( 1 )

[0050] In formula (1), y is the signal received by the base station side, h k is the uplink channel of user...

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Abstract

The invention discloses a wireless communication link adaptive method and an uplink and downlink adaptive method. During downlink transmission, at each user, according to statistical channel information of each user, adaptive transmission parameters correspondingly transmitted by the user are calculated by use of a certainty equivalent method, then the adaptive transmission parameters are sent to a base station side through a feedback channel as parameters of downlink adaptive transmission; and during uplink transmission, at the base station side, according to the statistical channel information, the adaptive transmission parameters corresponding to each user is calculated by use of the certainty equivalent method, then an optimal encoding modulation mode of each user is transmitted to each user through the feedback channel as uplink adaptive transmission parameters. According to the invention, the calculation complexity of large-scale antenna downlink adaptive parameters can be greatly reduced, the performance loss is quite low, and the robustness is quite good.

Description

technical field [0001] The invention relates to the field of large-scale array antenna communication, in particular to a wireless communication link self-adaptation method and an uplink-downlink self-adaptation method. Background technique [0002] The large-scale array antenna communication system technology requires large-scale antennas to be configured on the base station side to serve a large number of terminals at the same time. In a large-scale array antenna communication system, link adaptive technology is also needed to improve transmission efficiency --- to make transmission suitable for different channel conditions. [0003] The link adaptation scheme in LTE includes a typical closed-loop space division multiplexing model, by calculating three parameters at the receiving end: RI (Rank Indicator), PMI (Precoding Matrix Indicator) and CQI (Channel Quality Indicator). After the precoding method is known, the selection of CQI becomes the core parameter in link adaptat...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04B7/0417H04B7/06H04B7/08
CPCH04B7/0417H04B7/0632H04B7/088H04L1/0006H04L1/0016H04L1/0026
Inventor 王闻今谢晓东高西奇江彬
Owner SOUTHEAST UNIV