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Multi-antenna base station transmission method and device independent of pilot

A multi-antenna and base station technology, which is applied in diversity/multi-antenna systems, space transmit diversity, radio transmission systems, etc., can solve the problems of non-reciprocity, suppressed channel capacity, and improvement, so as to reduce resource consumption and complexity The effect of low and attainable speed improvement

Active Publication Date: 2020-04-07
TSINGHUA UNIV
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Problems solved by technology

In TDD mode, due to the reciprocity of the channel state information of the uplink channel and the downlink channel within the coherent time, the base station can estimate the state information of the downlink channel through the uplink channel pilot. The system overhead is determined by the total number of user terminal antennas. The base station antenna The number is not limited, so it is very suitable for this system solution; in the frequency division duplex mode, the uplink channel and the downlink channel are not reciprocal. The traditional solution uses the downlink pilot to assist channel estimation and obtain uplink feedback to obtain the sender channel. State information, but the pilot and feedback overhead required by this scheme become unacceptable due to the large increase in the number of base station antennas, which seriously inhibits the improvement of channel capacity

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  • Multi-antenna base station transmission method and device independent of pilot
  • Multi-antenna base station transmission method and device independent of pilot
  • Multi-antenna base station transmission method and device independent of pilot

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Embodiment Construction

[0029] The present invention will be described below with reference to exemplary embodiments.

[0030] For this purpose, in a first aspect, the present invention proposes a multi-antenna base station transmission method that does not rely on pilots, comprising steps:

[0031] S101. Predefine a coding vector set V=[v] composed of N precoding vectors 1 ,v 2 ,...v N ], where the nth precoding vector v in the encoding vector set V n is the M×M matrix W's Column, element w in row a and column b of matrix W ab Can be expressed as:

[0032]

[0033] where j is the imaginary unit, the function Indicates that the real number x is rounded down, the number of antennas of the base station is M, the number of users is K, and 1≤N≤M;

[0034] S102. With the preset transmission power P, the preset noise and the preset channel vector h of the kth user k , broadcast all precoding vectors in the precoding vector set V to all users one by one;

[0035] S103. Receive the bits fed b...

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Abstract

The invention provides a multi-antenna base station transmission method and device independent of pilot frequency for solving a problem in the prior art that an increase in channel capacity is suppressed seriously because a required pilot and feedback overhead become unacceptable due to a substantial increase in the number of base station antennas. The pilot-independent multi-antenna base station transmission method comprises the following steps of: pre-defining a pre-coding vector set V = [v1, v2, ... vN] consisting of N pre-coding vectors; broadcasting all the pre-coding vectors in the pre-coding vector set V to all users one by one; and S103: calculating S scheduled users k1, k2 ... ks according to bits {a11, ... akn, ... aKN} fed back by all the users, enabling the system to allocate the pre-coding vectors vk1, vk2,..., Vks to the S scheduled users respectively, and enabling the system to use the pre-coding vectors vk1, vk2,... Vks to serve the S users simultaneously and respectively. The method and device do not depend on pilot, can be used as a transmission scheme of a large-scale multi-antenna system in a frequency division duplex mode, and significantly reduce the huge overhead required by the estimation and feedback of channel state information at a transmitting end in a traditional scheme.

Description

technical field [0001] The present invention relates to communication technology / computer technology, in particular to a multi-antenna base station transmission method and equipment that do not rely on pilots. Background technique [0002] The high spectral efficiency and energy efficiency have made massive multi-antenna systems attract widespread attention from academia and industry in the past few years, and have become one of the core candidate technologies for fifth-generation wireless communication systems. The traditional multi-antenna system obtains spatial multiplexing and diversity gain by using multiple transmitting antennas and receiving antennas at the transmitting end and receiving end respectively, which can double the channel capacity of the system under the condition of certain spectrum resources and antenna power, and effectively Suppress channel fading and reduce bit error rate. Large-scale multi-antenna system has obvious advantages as a transitional solu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456H04B7/06H04L5/14
CPCH04B7/0456H04B7/06H04L5/14
Inventor 冯伟葛宁赵健张英杰
Owner TSINGHUA UNIV
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