Energy-efficient communication for user-relay aided cellular networks with OFDMA

Abstract

Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Energy Efficiency for MISO-OFDMA-Based User-Relay Assisted Cellular Networks

“…It is well-known that there is a trade-off between the EE and SE and it has been studied in many works for different wireless communication scenarios [6][10] [12] [17]. Thus, in this part, in the light of the existing literature, we will also examine this trade-off for our scenario by comparing the proposed EE maximization for MISO-OFDMA scheme with the existing capacity maximization for MISO-OFDMA scheme for different system parameters.…”

“…As mentioned in Section IV.B, in the existing capacity maximization scheme, the objective function is changed but the constraints are kept the same. This algorithm is used in many works as a benchmark algorithm to examine the EE and SE trade-off [6][10] [12] [17]. Figures 6 and 7 illustrate the EE and total data rates of the MISO-OFDMA based user-relay assisted cellular networks under different maximum allowed transmit power, .…”

“…Recently, much effort has been spent in developing energyefficient radio resource management (RRM) schemes. Many works have investigated the EE maximization problem for classical SISO-OFDMA networks with fixed relays [6]- [8] and user-relays [9]- [12]. In [9], decode and forward (DF) user relays were used and EE problem was formed by using individual user rate constraints for an uplink scenario.…”

“…In [11], the authors defined EE maximization problem by using discrete modulation levels in order to make the problem more practical and presented a RRM algorithm for their defined optimization problem. In [12], the EE maximization problem was defined for DF user relaying scheme by considering the QoS requirements of the users and two-step practical solution was presented. EE maximization problem in which system capacity is enlarged and system energy consumption is reduced at the same time also transferred to the multi-antenna transmission scheme [ [17].…”

Statistical QoS guarantees of a device‐to‐device link assisted by a full‐duplex relay

“…The benefits of using intermediate relays in wireless networks brought the interests of the research industry into this direction. It leads to research into different aspects of relay‐assisted communication such as uplink and downlink transmissions, 4,5 energy efficiency, 6 full‐duplex (FD), and half‐duplex (HD) relays, 7 etc. Moreover, the use of relays in D2D communication opens the door for various new research challenges as well as its potential as one of the key enabling technologies for B5G cellular networks.…”