System-Level Throughput Evaluations in Evolved UTRA
Yoshiaki Ofuji, Teruo Kawamura, Yoshihisa Kishiyama, Kenichi Higuchi, Mamoru Sawahashi · 2006
This paper presents simulation results on the achievable spectrum efficiency, user throughput, and peak data rate in the orthogonal frequency division multiplexing (OFDM) based evolved UTRA (E-UTRA) downlink and single-carrier frequency division multiple access (SC-FDMA) based uplink in order to clarify the link-level performance gain of E-UTRA compared to high-speed downlink packet access (HSDPA) and enhanced DCH (E-DCH). The simulation results show that in the OFDM based downlink, the spectrum efficiency is increased to approximately 230% compared to that for HSDPA at the activity factor of approximately 0.6-0.8, and that the user throughput at the cumulative distribution function (CDF) of 5% and the average user throughput are increased to greater than 200 and 300%, respectively, compared to those for HSDPA at the spectrum efficiency of less than 0.6 bps/Hz. Moreover, in the SC-FDMA based uplink, the spectrum efficiency of E-UTRA is improved to approximately 190% compared to that for E-DCH, and the user throughput at the CDF of 5% and average user throughput are greater than 200% that of E-DCH. In the downlink employing 2-by-2 multiple-input multiple-output (MIMO) multiplexing with a 20-MHz transmission bandwidth, the target peak data rate of 100 Mbps is achieved at the average received signal energy per symbol-to-noise power spectrum density ratio (Es/N0) of approximately 23.5 dB using 64QAM and turbo coding with R=3/4 employing QRM-MLD, i.e., maximum likelihood detection using QR decomposition and the M-algorithm, with adaptive selection of surviving symbol replica candidates (ASESS). Furthermore, in the uplink assuming single-antenna transmission and two-branch antenna diversity reception, the target peak data rate of 50 Mbps is achieved at the average received Es/N0of approximately 23 dB using 16QAM associated with the coding rate of R=8/9