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A broadband multiple-input-multiple-output (MIMO) antenna with a small size of 170 × 187 mm2 is investigated. By placing the two circular planar-monopole (PM) antenna elements perpendicularly, a good isolation is achieved. In addition, by adding two L-shaped stubs and embedding a slit on the ground plane, the isolation and bandwidths of the two perpendicularly placed antennas are improved. More specifically,...
Unitary space-time modulation (USTM) is ideally suited for rapid fading scenarios, where neither the transmitter nor the receiver have the channel state information (CSI). However, it has received limited attention compared with the space-time coding schemes that need CSI. An important reason for that is USTM needs too large calculation amount when meeting with a large size constellation. We propose...
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