US 11,838,079 B2
MIMO systems
Linglong Dai, London (GB); Bichai Wang, London (GB); Richard Mackenzie, London (GB); Mo Hao, London (GB); and Xinyu Gao, London (GB)
Assigned to British Telecommunications Public Limited Company, London (GB)
Appl. No. 17/250,977
Filed by BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY, London (GB)
PCT Filed Sep. 13, 2019, PCT No. PCT/EP2019/074532
§ 371(c)(1), (2) Date Apr. 6, 2021,
PCT Pub. No. WO2020/074213, PCT Pub. Date Apr. 16, 2020.
Claims priority of application No. 201811171585.8 (CN), filed on Oct. 9, 2018.
Prior Publication US 2021/0344393 A1, Nov. 4, 2021
Int. Cl. H04B 7/0456 (2017.01); H01Q 3/24 (2006.01); H01Q 3/38 (2006.01); H01Q 15/02 (2006.01)
CPC H04B 7/0469 (2013.01) [H01Q 3/24 (2013.01); H01Q 3/38 (2013.01); H01Q 15/02 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A multiple-input-multiple-output (MIMO) transmitter for transmitting wireless communication signals over a wideband communication channel to a receiver, the MIMO transmitter comprising:
a digital signal processor configured to perform pre-coding on a plurality Ns of data streams;
a plurality NRF 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 pre-coded data stream;
a lens antenna array comprising an array of NT antenna elements; and
a selecting unit coupled between the plurality of NRF 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 NTBRF antenna elements concurrently for transmitting the signal representing the pre-coded data stream passed through that RF chain,
wherein each coupling unit further comprises a set of phase shifter modules configured to adjust at least one of an amplitude or a phase of each selected wireless communication signal to be communicated via that RF chain, and wherein each phase shifter module comprises two phase shifters.