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Broadband wireless transmission method assisted by distributed intelligent reflecting surface

A broadband wireless and transmission method technology, applied in transmission systems, transmission monitoring, digital transmission systems, etc., to achieve the effects of reducing computational complexity, reducing training overhead, and enhancing downlink transmission rates

Active Publication Date: 2021-03-26
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, each IRS needs to adjust the phase shift of hundreds of reflection units in the IRS according to the optimized high-dimensional phase shift matrix. For the distributed multi-IRS auxiliary scheme, a large amount of feedback overhead for the high-dimensional phase shift matrix between the base station and each IRS become a problem for system implementation

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  • Broadband wireless transmission method assisted by distributed intelligent reflecting surface
  • Broadband wireless transmission method assisted by distributed intelligent reflecting surface
  • Broadband wireless transmission method assisted by distributed intelligent reflecting surface

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Embodiment Construction

[0035] Below in conjunction with accompanying drawing and concrete implementation example, the present invention will be further described:

[0036] Such as figure 1 In the distributed IRS-assisted large-scale multi-antenna millimeter-wave broadband OFDM system shown, there is a configuration N B dimensional antenna array base station, N S An IRS configured with an M-dimensional array, a single-antenna user; the maximum delay L of the multipath channel between the sth IRS and the user s , the delay power spectrum is in is the channel standard deviation on the i-th time tap; the line-of-sight channel G from the base station to the s-th IRS is known s . The user sends the uplink pilot, and the IRS and the base station perform distributed channel estimation, and set the phase shift matrix of each IRS according to the channel state information to maximize the downlink rate.

[0037] figure 2 The relationship between the downlink traversal rate and the number M of IRS a...

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Abstract

The invention discloses a broadband wireless transmission method assisted by a distributed intelligent reflecting surface, and is suitable for the field of wireless communication. The method comprisesthe steps: evaluating the influence of each system parameter according to the closed expression of the downlink traversal rate of a large-scale multi-antenna millimeter wave broadband orthogonal frequency division multiplexing system, and guiding the hardware erection of an IRS array plane; in broadband system transmission, by a user, sending a pilot signal, estimating a reflection channel of each IRS, matching the strongest time domain tap to reduce complexity, channel estimation overhead and feedback quantity, and using an IRS phase shift matrix to match a IRS-to-user channel, a base station-to-IRS channel, and a base station-to-user channel to maximize downlink rate. An IRS transmission method with low channel estimation overhead, low feedback quantity and low complexity is provided, and an IRS phase shift matrix is used for matching the IRS-to-user channel, the base station-to-IRS channel and the base station-to-user channel so as to maximize the downlink rate.

Description

technical field [0001] The invention relates to a broadband wireless transmission method, in particular to a broadband wireless transmission method that is assisted by a distributed intelligent reflection surface and is suitable for use in the technical field of wireless communication. Background technique [0002] In traditional wireless communication systems, the communication channel is not controlled by the user, and the communication performance depends on the channel state. In multi-antenna systems, IRS technology provides an effective way to change the wireless communication environment. IRS is compatible with the existing communication system, and assists the wireless communication system by configuring a large-scale reflection array on the outer wall of the building. The IRS array contains a large number of reflection units, each of which is equipped with a digital phase shifter. By changing the phase shift of the phase shifter, each IRS unit can independently cha...

Claims

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Application Information

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IPC IPC(8): H04B7/145H04L25/02H04L27/26H04B17/364
CPCH04B7/145H04L25/0204H04L25/0224H04L25/0256H04L27/2601H04B17/364Y02D30/70
Inventor 许威何沐昕赵春明
Owner SOUTHEAST UNIV
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