TY - GEN
T1 - Throughput performance of adaptive frequency offset selection for amplify-and-forward relay in multiuser environment
AU - Shiba, Takayuki
AU - Sanada, Yukitoshi
N1 - Funding Information:
Figure 2 shows the frequency assignment of the OFDMA signal. MSs are assigned to every RBs by PF scheduling. Suppose that the number of null subcarriers is F and the number of RBs is B. From the 1st to the ρBth RBs are assigned to the RSs. ρ is the fractional factor for fractional frequency reuse (FFR) at the cell edge. Hence, without loss of generality, the lower frequency of the band is assigned to the RSs and the MSs supported by the RSs receive signals through the subcarriers from (F + 1) to (F + 12ρB).
Publisher Copyright:
© 2018 IEEE.
PY - 2018/7/20
Y1 - 2018/7/20
N2 - This paper proposes an adaptive frequency offset scheme in an amplify-and-forward (AF) relay station (RS). When the RSs are at a cell edge, frequency resources are partially assigned between them and a base station (BS) to avoid inter-cell interference. On the other hand, the RS is expected to use a higher frequency band for transmission in the next generation mobile communication system. The whole frequency band can be used in the transmission between the RS and a mobile station (MS) while the RS uses only the restricted bandwidth in the low frequency band. In the proposed AF relay scheme, the frequency of the signal from the RS is shifted adaptively in accordance with the frequency response of the channel between the RS and the MS. In this scheme, the relay transmission is assumed to use a wider bandwidth between the RS and the MS than that between the BS and the RS. By making use of the better frequency response between the RS and the BS owing to the adaptive frequency offset scheme the total throughput of the cell improves. It is shown with numerical results obtained through computer simulation that for a two-user case the proposed scheme improves the total throughput by about 1.2 to 1.3 times with proportional fairness scheduling especially at a low Eb/N0 condition.
AB - This paper proposes an adaptive frequency offset scheme in an amplify-and-forward (AF) relay station (RS). When the RSs are at a cell edge, frequency resources are partially assigned between them and a base station (BS) to avoid inter-cell interference. On the other hand, the RS is expected to use a higher frequency band for transmission in the next generation mobile communication system. The whole frequency band can be used in the transmission between the RS and a mobile station (MS) while the RS uses only the restricted bandwidth in the low frequency band. In the proposed AF relay scheme, the frequency of the signal from the RS is shifted adaptively in accordance with the frequency response of the channel between the RS and the MS. In this scheme, the relay transmission is assumed to use a wider bandwidth between the RS and the MS than that between the BS and the RS. By making use of the better frequency response between the RS and the BS owing to the adaptive frequency offset scheme the total throughput of the cell improves. It is shown with numerical results obtained through computer simulation that for a two-user case the proposed scheme improves the total throughput by about 1.2 to 1.3 times with proportional fairness scheduling especially at a low Eb/N0 condition.
UR - http://www.scopus.com/inward/record.url?scp=85050961614&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85050961614&partnerID=8YFLogxK
U2 - 10.1109/VTCSpring.2018.8417824
DO - 10.1109/VTCSpring.2018.8417824
M3 - Conference contribution
AN - SCOPUS:85050961614
T3 - IEEE Vehicular Technology Conference
SP - 1
EP - 5
BT - 2018 IEEE 87th Vehicular Technology Conference, VTC Spring 2018 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 87th IEEE Vehicular Technology Conference, VTC Spring 2018
Y2 - 3 June 2018 through 6 June 2018
ER -