Artiza LTE eNB Test Solutions

Physical Interface

According to Overview of 3GPP, LTE radio access technology is described as follows:

The multiple access scheme for the LTE physical layer is based on Orthogonal Frequency Division Multiple Access (OFDM) with a Cyclic Prefix (CP) in the downlink and a Single Carrier Frequency Division Multiple Access (SC-FDMA) with CP in the uplink.
OFDMA technique is particularly suited for frequency selective channel and high data rate. It transforms a wideband frequency selective channel into a set of parallel flat fading narrowband channels, thanks to CP. This ideally, allows the receiver to perform a low complex equalization process in frequency domain, i.e., 1 tap scalar equalization.

The baseband signal representing a downlink physical channel is defined in terms of the following steps:
  • scrambling of coded bits in each of the code words 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
The baseband signal representing the physical uplink shared channel is defined in terms of the following steps, as shown in the below figure:
  • scrambling
  • modulation of scrambled bits to generate complex-valued symbols
  • transform precoding to generate complex-valued symbols
  • mapping of complex-valued symbols to resource elements
  • generation of complex-valued time-domain SC-FDMA signal for each antenna port
Figure 10: Overview of downlink physical channel processing.

Figure 10: Overview of downlink physical channel processing.

Figure 11: Overview of uplink physical channel processing.

Figure 11: Overview of uplink physical channel processing.