SPARCs for Unsourced Random Access
SPARCs for Unsourced Random Access
Unsourced random-access (U-RA) is a type of grant-free random access with a virtually unlimited number of users, of which only a certain number K <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">a</sub> are active on the same time slot. Users employ exactly the same codebook, and the task of the receiver is to decode the …