Question: In a 5G New Radio (NR) resource grid, how is each element, known as a Resource Element (RE), uniquely identified within an antenna port and subcarrier spacing configuration?
Option 1: By its position in the time domain only, relative to a reference point.
Option 2: Solely by its index in the frequency domain.
Option 3: By a combination of its index in the frequency domain (k) and symbol position in the time domain (l), relative to a reference point.
Option 4: Through its complex value representation alone.
Explanation: In the context of 5G NR resource grids, each Resource Element (RE) is uniquely identified by two key parameters: its position in the frequency domain (denoted by index 'k') and its symbol position in the time domain (denoted by 'l'), with 'l' being relative to a specified reference point. This dual identification ensures precise location within the grid, crucial for efficient resource allocation and data transmission in wireless communications.