6.3 General structure for downlink physical channels

36.2113GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Physical channels and modulationRelease 17TS

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