Section: 6.2 Slot structure and physical resource elements 6.3 General structure for downlink physical channels
Content: This clause describes a general structure, applicable to more than one physical channel. The baseband signal representing a downlink physical channel is defined in terms of the following steps: - scrambling of coded bits in each of the codewords to be transmitted on a physical channel - modulation of scrambled bits to generate complex-valued modulation symbols - mapping of the complex-valued modulation symbols onto one or several transmission layers - precoding of the complex-valued modulation symbols on each layer for transmission on the antenna ports - mapping of complex-valued modulation symbols for each antenna port to resource elements - generation of complex-valued time-domain OFDM signal for each antenna port Figure 6.3-1: Overview of physical channel processing