ts defined by the 3GPP (3GPP 25.913), the LTE physical layer should sup- port peak data rates of more than 100 Mb/s over the downlink and 50 Mb/s over the uplink. A flexible transmission bandwidth ranging from 1.25 to 20 MHz will provide support for users with different capabilities. These requirements will be ful- filled by employing new technologies for cellular environments, such as OFDM or multiantenna schemes (3GPP 36.201). Additionally, channel variations in the time/ frequency domain are exploited through link adaptation and frequency-domain scheduling, giving a substantial increase in spectral efficiency. In order to support transmission in paired and unpaired spectra, the LTE air interface supports both FDD and TDD modes. Chapter 3 ("Radio-Interface Physical Layer") presents a detailed description of the LTE radio-interface physical layer. Section 3.1 provides an introduction to the physical layer, focusing on the physical resources' structure and the set of procedures defined within this layer. This section provides a general overview of the different multiantenna technologies considered in LTE and its related physical layer proce- dures. Link adaptation techniques, including adaptive modulation, channel coding, and channel-aware scheduling, are described in Section 3.2. The topic of multiple antenna schemes for LTE is tackled in Section 3.3, which also provides an overview of the different multiantenna configurations and multiantenna-related procedures defined in LTE. Section 3.4 addresses other physical layer procedures like channel estimation, synchronization, and random access. This section is focused on those procedures that allow the reception and decoding of the frame under a certain bit error rate (BER) level: synchronization and channel estimation. Furthermore, this section also presents the random access (RA) structure and procedure necessary for initial synchronization in the uplink prior to UE data transmission. Chapter 4 ("Architecture and Protocol Support for Radio Resource Management") di