CPC H04B 7/0469 (2013.01) [H01Q 3/24 (2013.01); H01Q 3/38 (2013.01); H01Q 15/02 (2013.01)] | 23 Claims |
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.
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