US 12,449,508 B2
Spatial-block code division multiplexing (CDM) for multiple input multiple output (MIMO) waveforms
Zhengzheng Li, Agoura Hills, CA (US)
Assigned to Aptiv Technologies AG, Schaffhausen (CH)
Filed by Aptiv Technologies AG, Schaffhausen (CH)
Filed on Sep. 6, 2022, as Appl. No. 17/929,984.
Claims priority of provisional application 63/252,338, filed on Oct. 5, 2021.
Prior Publication US 2023/0104290 A1, Apr. 6, 2023
Int. Cl. G01S 7/35 (2006.01); G01S 13/58 (2006.01); G01S 13/931 (2020.01)
CPC G01S 7/354 (2013.01) [G01S 13/584 (2013.01); G01S 13/931 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A system comprising:
multiple transmitters configured to simultaneously emit multiple electromagnetic (EM) signals across multiple channels;
multiple receivers configured to obtain reflections of the EM signals from one or more objects;
multiple phase shifters configured to introduce at least one phase shift in the EM signals or the reflections; and
at least one processor configured to:
cause the transmitters to emit the EM signals as sequential spatial blocks, each spatial block having multiple slots outnumbering the channels, each slot corresponding to a specific code of phase shifts applied by the phase shifters across the channels during that slot;
apply a respective Fast-Fourier Transformation to the reflections to generate complex observations at each of the channels during each of the slots;
determine, based on the complex observations, whether a Doppler phase shift between two of the slots included in a spatial block has multiple possible values, the specific code of phase shifts corresponding to at least two of the slots that outnumber the channels is a same code of phase shifts; and
responsive to determining that the Doppler phase shift between two of the slots has multiple possible values, output an indication of a mixed Doppler interval detected in that spatial block.