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A partial zero-forcing precoding method in a multi-cell MU-MISO system

A zero-forcing precoding and multi-cell technology applied in the field of network communication

Active Publication Date: 2018-12-18
PEKING UNIV
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It can be seen that these two schemes are not always optimal for the system

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  • A partial zero-forcing precoding method in a multi-cell MU-MISO system
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  • A partial zero-forcing precoding method in a multi-cell MU-MISO system

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Embodiment Construction

[0018] The present invention will be described in detail below through specific embodiments and accompanying drawings.

[0019] The present invention considers a downlink system composed of two interfering cells, where each base station has N antennas and each user has a single antenna. Each base station only has the data of users in its own cell, and precodes the user data. Such as figure 1 As shown, two base stations are located at positions 0 and 2R respectively, and each cell includes M randomly distributed users (M≥N). Taking cell 1 as an example, the location of any user in the cell obeys [-R, -r 0 ] and [r 0 , R] uniform distribution on the interval, where r 0 Indicates the minimum distance between the user and the base station. Active users in cell 1, that is, users who are scheduled to transmit data, receive useful signals and IUI from base station 1 at the same time ( figure 1 solid line) and the ICI from neighboring base station 2 ( figure 1 dotted line). Th...

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Abstract

The invention discloses a partial zero-forcing precoding method in a multi-cell MISO system. The method comprises the following steps: each base station uses its own spatial DoFs to perform zero-forcing precoding on users to be dispatched on the same frequency in the corresponding cell of the base station, wherein the sum of the number of subscribers K and c to be scheduled on the same frequency in the cell i corresponding to the base station i is less than or equal to the number of spatial DoFs of the base station i; c is the number of neighboring area users selected by the base station i forICI cancellation; 0<c <N / 2; and N is the number of antennas of the base station i. c neighboring area users are selected according to the rule that c neighboring area users with the strongest averageICI caused by the base station i or closest to the base station I are selected. The invention can eliminate the IUI of each user to other users of the cell and the ICI of a part of users of the neighboring cell.

Description

technical field [0001] The invention relates to a partial zero-forcing precoding method in a multi-cell MU-MISO system, and belongs to the technical field of network communication. Background technique [0002] Multiple-input multiple-output (MIMO) is a key technology in cellular networks. It can provide relative Higher spectral efficiency than single-antenna systems. Multi-user MIMO (multi-user MIMO, MU-MIMO) has been considered as a core technology of MIMO, and has been supported by 4G since LTE R8 (refer to Q.Li, G.Li, W.Lee, M.i.Lee, D. Mazzarese, B. Clerckx, and Z. Li, “Mimo techniques in wimax and lte: a feature overview,” IEEE Commun. Mag., vol.48, no.5, pp.86–92, 2010.). [0003] In the downlink multi-cell multi-user multiple-input multiple-output (MU-MISO) system, users suffer from intra-cell inter-user interference (IUI) and inter-cell interference (inter- cell interference). Zero-forcing beamforming (ZFBF) using spatial DoFs at the base station is a transmissi...

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Application Information

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IPC IPC(8): H04L25/03H04B7/0456
CPCH04B7/0456H04L25/03006H04L25/03891H04L2025/03624
Inventor 屈婉月禹宏康赵玉萍李斗
Owner PEKING UNIV
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