Sparse Array Enabled Communications and Sensing for Extremely Large-Scale Array
The application of extremely large-scale array can significantly increase transmission distance and enhance spectral efficiency,over-coming path loss and thus bringing new development opportunities to communications.With users potentially located in the near-field region of the base station equipped with an extremely large-scale array,a more accurate spherical wave model needs to be adopted.However,ex-tremely large-scale array faces challenges such as high hardware costs,energy consumption,and complex signal processing algorithms.To ad-dress this issue,the sparse array is used to construct extremely large-scale array,enabling integrated sensing and communication.An in-depth analysis of the key issues of sparse arrays in both far-field and near-field communication and sensing is conducted.The challenges of existing sparse array applications are discussed,and then future research directions for sparse arrays are presented.
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