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Transmission power and pilot joint optimization scheme in time division duplex massive MIMO system

A transmission power and joint optimization technology, applied in the transmission system, pilot signal distribution, digital transmission system, etc.

Inactive Publication Date: 2019-04-26
BEIJING UNIV OF TECH
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is a joint optimization scheme of transmission power and pilot frequency in a time-division duplex massive MIMO system. By jointly allocating pilot power and data power, a new pilot allocation scheme is proposed to reduce pilot Reduce frequency pollution and balance mutual interference, increase the data transmission rate of the uplink, and improve the SINR performance of the system at the same time

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  • Transmission power and pilot joint optimization scheme in time division duplex massive MIMO system
  • Transmission power and pilot joint optimization scheme in time division duplex massive MIMO system
  • Transmission power and pilot joint optimization scheme in time division duplex massive MIMO system

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0042] We adopt the hexagonal cell model to construct a symmetrical multi-cell network consisting of L=7 cells, and the distribution of users in the present invention is randomly distributed in the hexagonal cells.

[0043] exist figure 2 In , we plot the user locations of 7 users per cell (randomly between 0.4r and 0.9r from their respective base stations), all users have the same temporal correlation Where + is a user, and □ is a base station. image 3 The maximized minimum rate increases slightly with the number of base station antennas; the correlation increases with time, implying slower time-varying channels and better Kalman filter channel estimates. On the other hand, the proposed schemes share some similarities in incremental trends, but with larger increases. More importantly, the proposed scheme provides a large performance improvement c...

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Abstract

For a pilot pollution problem of a time division duplex massive MIMO system, the invention provides a transmission power and pilot joint optimization scheme in the time division duplex time massive MIMO system, thereby reducing pilot pollution and balancing mutual interference. Instant channel state information before pilots is unknown. Through utilization of a Gauss-Markov process of time relatedchannels and through adoption of a Kalman filter, the pilot pollution is reduced, and priori estimated values are provided. Deterministic approximation of rates is derived as priori channel estimation and priori error estimation functions. Maximum-minimum rates are realized. On the basis, a heuristic pilot allocation scheme is provided. A simulation value result confirms an improvement rate provided by the scheme.

Description

technical field [0001] The invention belongs to the technical field of time-division duplex massive MIMO. In order to alleviate the influence of pilot pollution and data interference on user transmission performance, based on the joint optimization method of user pilot power and data power, a new pilot allocation scheme is proposed to effectively reduce Pilot pollution to improve system performance technical background [0002] Massive MIMO is widely regarded as a key technology in wireless communication, which provides high spectral efficiency and energy efficiency by using hundreds or even more antennas. A lot of current research work is carried out for massive MIMO in TDD mode, which estimates the channel response on the uplink, which can be used for uplink receive combining and downlink transmit precoding based on channel reciprocity. Therefore, no feedback is required, and less training overhead is required, so that the required length of the pilot sequence is proporti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04W72/08H04B7/0426H04W72/54
CPCH04B7/0426H04L5/0048H04L5/006H04W72/542Y02D30/70
Inventor 张延华林波杨睿哲孙艳华吴文君
Owner BEIJING UNIV OF TECH
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