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Method for precoding transmissions from an antenna array

An antenna array and precoding technology, applied in the field of transmission precoding, can solve problems such as the ability to limit the propagation environment

Active Publication Date: 2021-06-11
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, although codebooks reduce CSI overhead, the efficient channel quantization inherent in codebooks currently limits the ability of codebooks to flexibly adapt to different propagation environments

Method used

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  • Method for precoding transmissions from an antenna array
  • Method for precoding transmissions from an antenna array
  • Method for precoding transmissions from an antenna array

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Embodiment Construction

[0047] Figure 1A A transmitting radio node 10 is depicted, referred to as transmitting node 10 for convenience. A sending node 10 (eg, an enhanced Node B in a Long Term Evolution LTE embodiment) performs a transmission from an associated antenna array 12 . Array 12 includes co-polarized antenna elements 14 aligned in a given spatial dimension of array 12 (eg, in horizontal dimension h or vertical dimension v). As shown, for example, array 12 includes eight co-polarized antenna elements 14 aligned in the vertical dimension v of the array. Array 12 may also include other antenna elements, but these elements are not in the Figure 1A shown in or in Figure 1A considered in the description.

[0048] The sending node 10 is configured to send a transmission 16 from an antenna array 12 to a receiving radio node (not shown and hereinafter simply referred to as "receiving node"). In some embodiments, the transmission 16 includes, for example, user data and / or reference signals dedic...

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Abstract

A transmitting radio node (10) precodes transmissions from an antenna array (12) to a receiving radio node (50). The array (12) includes co-polarized antenna elements (14) aligned in a given spatial dimension of the array (12). The transmitting radio node (10) uses a corresponding coarse-grained precoder that can be factored out from a multi-grained precoder (12) targeting a given spatial dimension of the array at different granularities for different The transmission of the subarrays (34a, 34b) is precoded to virtualize the subarrays (34a, 34b) into different auxiliary units (38a, 38b). The transmitting radio node (10) also precodes transmissions from different auxiliary units (38a, 38b) using one or more finer-grained precoders, which can also be obtained from The multi-granularity precoder is factored out. In this case, a coarse-grained precoder and one or more finer-grained precoders are represented within one or more codebooks (26) used for said precoding.

Description

technical field [0001] The present application relates generally to transmission precoding, and in particular to precoding transmissions from an antenna array comprising co-polarized antenna elements aligned in a given spatial dimension. Background technique [0002] Precoding transmissions from an antenna array involves applying a set of complex weights to signals to be transmitted from the antenna elements of the array to independently control the phase and / or amplitude of the signals. This set of complex weights is called a "precoder". A sending node typically chooses a precoder to match the current channel conditions on the link to the receiving node with the goal of maximizing link capacity or quality. If multiple data streams are transmitted simultaneously from the array's antenna elements using spatial multiplexing, the sending node typically also selects a precoder with the aim of orthogonalizing the channel and reducing inter-stream interference at the receiving no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456H04B7/06
CPCH04B7/0469H04B7/0478H04B7/065
Inventor 尼古拉斯·维尔耐尔森塞巴斯蒂安·法克瑟斯万特·伯格曼
Owner TELEFON AB LM ERICSSON (PUBL)