mplexity receiver. However, OFDM requires an expensive and inherently inef- ficient power amplifier in the transmitter due to the high peak-to-average power ratio (PAPR) of the multicarrier signal. Chapter 6 ("Single-Carrier Transmission for UTRA LTE Uplink") presents the key techniques for LTE uplink as well as the baseline performance. Radio access technology is the key aspect in LTE uplink, and two radio access schemes, SC-FDMA and OFDMA, are studied. The performance results are obtained from a detailed UTRA LTE uplink link-level simulator. The simulation results show that both SC-FDMA and OFDMA can achieve a high spectral efficiency; however, SC-FDMA benefits in obtaining lower PAPR than OFDMA, especially for low- order modulation schemes. A 1 X 2 SIMO (single input, multiple output) antenna configuration highly increases the spectral efficiency of SC-FDMA, making the performance of SC-FDMA with a minimum mean square error (MMSE) receiver comparable to OFDMA, especially at high coding rates. The peak spectral effi- ciency results for SC-FDMA confirm that it meets the requirement to achieve a spectral efficiency improvement of two or three times that of 3GPP release 6. LTE uplink numerology is introduced in Section 6.2. The description of both radio access techniques is given in Section 6.3. The PAPR evaluation for each radio access scheme is discussed in Section 6.4. Section 6.5 describes the link-level model used for the evaluations in this work, including the specific parameter settings. Afterward, the LTE uplink performance with various key techniques is presented, including link adaptation (Section 6.6), fast H-ARQ (Section 6.7), antenna config- uration (Section 6.8), flexible frequency allocation (Section 6.9), and typical chan- nel estimation (Section 6.10). Finally, turbo equalization is presented in Section 6.11 as a performance enhancement technique for SC-FDMA transmission. The chapter concludes by showing the impact of the nonlinear power amplifier to both in-band and out-of-band performance. In th