UMTS: Alive and Well - 4G Americas

far problem is present due to the orthogonal uplink transmissions. Transmission parameters, coding andmodulation are similar to the downlink transmission.The chosen SC-FDMA solution is based on the use of cyclic prefix to allow high performance and lowcomplexity receiver implementation in the eNodeB. As such, the receiver requirements are more complexthan in the case of OFDMA for similar link performance but this is not considered to be a problem in thebase station. The terminal is only assigned with contiguous spectrum blocks in the frequency domain tomaintain the single-carrier properties and thereby ensure power-efficient transmission. This approach isoften referred to as blocked or localized SC-FDMA. The general SC-FDMA transmitter and receiverconcept with frequency domain signal generation and equalization is illustrated in Figure C.23.Bits ModulatorDFTSub-carrier…IFFTCyclicExtensionMMSEEqualiserFFTRemoveCyclicExtensionIFFT IDFTDemodulator BitsFigure C.23. SC-FDMA Transmitter and Receiver Chains with FrequencyDomain Equalization. 197C.2.2.2.1MAPPING BETWEEN TRANSPORT AND PHYSICAL CHANNELThe LTE uplink (UL) comprises of the following physical channels:• Physical random access channel (PRACH)• Physical uplink control channel (PUCCH)• Physical uplink shared channel (PUSCH)The mapping between transport and physical channels are shown in Figure C.24. Currently, two transportchannels are defined for LTE – Random Access Channel (RACH) and Uplink Shared Channel (UL-SCH).197 Lindholm, Jari and Timo Lunttila, Kari Pajukoski, Antti Toskala, Esa Tiirola. EUTRAN Uplink Performance. InternationalSymposium on Wireless Pervasive Computing 2007 (ISWPC 2007). San Juan, Puerto Rico, USA. 5-7 February 2007.www.3GAmericas.org February 2010 Page 174