By Topic

Investigations on Optimum Roll-off Factor for DFT-Spread OFDM Based SC-FDMA Radio Access in Evolved UTRA Uplink

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

4 Author(s)
Teruo Kawamura ; Radio Access Network Development Department, NTT DoCoMo, Inc., 3-5 Hikari-no-oka, Yokosuka-shi, Kanagawa 239-8536 Japan ; Yoshihisa Kishiyama ; Kenichi Higuchi ; Mamoru Sawahashi

This paper investigates the optimum roll-off factor value of the spectrum shaping filter in DFT-Spread OFDM based single- carrier frequency division multiple access (SC-FDMA) using the criterion of the maximum achievable throughput considering a cubic metric (CM) in the Evolved UTRA uplink. Simulation results show that the increase in throughput by employing the roll-off factor of greater than zero is small, although a roll-off factor of alpha = 0.16 slightly improves the throughput compared to that for alpha = 0.0 for 16QAM modulation with high coding rates only when there is multiuser interference from/to the adjacent channels. Moreover, in the low received signal energy per-symbol-to-noise power spectrum density ratio (Es/N0,) region where repetition coding is necessary, although we observe that alpha = 0.16 achieves higher throughput than alpha = 0.0 for the respective repetition factor (RF) values owing to the lower CM value with alpha = 0.16, the advantage obtained when alpha = 0.16 is concealed by the use of a high RF value and the advantage of alpha = 0.16 is observed only with the highest RF value, i.e., minimum modulation and coding scheme. As a result, we conclude that the benefits to using a high roll-off factor that provides a low CM are minor and subsequently, spectrum shaping with a roll-off factor of greater than zero is not necessary in the average received Es/N0 region in cellular environments.

Published in:

2006 3rd International Symposium on Wireless Communication Systems

Date of Conference:

6-8 Sept. 2006