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MIMO systems

A transmitter and receiver technology, applied in the field of MIMO systems, can solve the problems of high hardware cost and power consumption

Pending Publication Date: 2021-05-14
BRITISH TELECOMM PLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it also typically requires a dedicated RF chain for each antenna
For mmWave MIMO systems where the number of antennas is typically large as mentioned above, this requirement results in undesirably high hardware cost and power consumption

Method used

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Embodiment Construction

[0067] To address the problem of performing all-digital precoding within mmWave MIMO systems, precoding can be split between digital and analog precoding. Splitting the precoding on the digital and analog domains enables a reduction in the size of the digital precoder. This size reduction is achieved by reducing the number of RF chains. Analog precoding is performed on the analog signal generated from the RF chain, and the purpose is to increase the gain of the antenna array by performing analog beamforming. In this way, the number of RF chains within the system can be reduced without suffering a corresponding loss of performance.

[0068] One way to achieve analog precoding is through a lensed antenna array. A lens antenna array includes a lens and an antenna array including a plurality of antenna elements in the array. The antenna elements may be located on the focal plane of the lens. A lens is an electromagnetic lens with directional focusing capabilities (ie, it serve...

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Abstract

According to the present invention there is provided a multiple-input-multiple-output (MIMO) transmitter for transmitting wireless communication signals over a communication channel to a receiver, the transmitter comprising: a digital signal processor configured to perform pre-coding on a plurality N s of data streams; a plurality N RF of radio-frequency (RF) chains each configured to pass a pre-coded data stream from the digital signal processor to generate a signal representing that data stream; a lens antenna array comprising an array of N T antenna elements; and a selecting unit coupled between the plurality N RF of RF chains and the lens antenna array, the selecting unit comprising a plurality of separate coupling units each configured to couple a respective RF chain to a selective sub-array of (1) antenna elements concurrently for transmitting the signal representing the data stream passed through that RF chain.

Description

technical field [0001] The present invention relates to MIMO systems. Background technique [0002] There is growing interest in millimeter wave (mmWave) wireless communication systems as they promise to meet the growing bandwidth demands of wireless devices. MmWave systems typically operate in the frequency band of 30GHz-300GHz. This is a much larger frequency band than the sub-6 GHz band currently used for Long Term Evolution (LTE) networks, and thus can support a larger bandwidth than currently supported by existing systems operating in the sub-6 GHz band. [0003] One issue associated with mmWave communications is the relatively high free-space path loss that may be experienced. This high path loss can lead to severe signal attenuation when experiencing congestion or communicating over long distances. [0004] The way to overcome this problem is to implement mmWave communication within a multiple-input multiple-output (MIMO) system. The relatively short wavelength of...

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Application Information

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IPC IPC(8): H04B7/06H04B7/0456H01Q3/34
CPCH04B7/0469H01Q19/062H01Q15/08H01Q25/007H04B7/0695H04B7/088H01Q3/24H01Q3/38H01Q15/02
Inventor 戴凌龙高昕宇王碧钗R·麦肯齐郝墨
Owner BRITISH TELECOMM PLC
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