NETp1-13: Studies in Downlink Spectral Efficiency of OFDMA Networks with MIMO and Opportunistic Scheduling

2006 ◽  
Author(s):  
Oghenekome Oteri ◽  
Nicolae Chiurtu ◽  
Frederick K. Lee ◽  
Mohamad Charafeddine ◽  
Arogyaswami Paulraj
Keyword(s):  
Spectral Efficiency ◽  
Opportunistic Scheduling ◽  
Ofdma Networks

Energy- and Spectral-Efficiency Tradeoff in Downlink OFDMA Networks

2011 ◽  
Vol 10 (11) ◽  
pp. 3874-3886 ◽  
Author(s):  
Cong Xiong ◽  
Geoffrey Ye Li ◽  
Shunqing Zhang ◽  
Yan Chen ◽  
Shugong Xu
Keyword(s):  
Spectral Efficiency ◽  
Ofdma Networks

Energy- and Spectral-Efficiency Tradeoff in Downlink OFDMA Networks

2011 ◽  
Author(s):  
Cong Xiong ◽  
Geoffrey Ye Li ◽  
Shunqing Zhang ◽  
Yan Chen ◽  
Shugong Xu
Keyword(s):  
Spectral Efficiency ◽  
Ofdma Networks

scholarly journals Calibration and Evaluation of Fixed and Mobile Relay-Based System Level Simulator

2010 ◽  
Vol 2010 ◽  
pp. 1-14 ◽  
Author(s):  
Shahid Mumtaz ◽  
Le Thanh Tu ◽  
Kazi Saidul ◽  
Atílio Gameiro
Keyword(s):  
Spectral Efficiency ◽  
Communication Systems ◽  
Path Loss ◽  
System Level ◽  
Cell Boundary ◽  
Wireless Communication Systems ◽  
Medium Access ◽  
Complex Interactions ◽  
Transmitting Antenna ◽  
Ofdma Networks

Future wireless communication systems are expected to provide more stable and higher data rate transmissions in the whole OFDMA networks, but the mobile stations (MSs) in the cell boundary experience poor spectral efficiency due to the path loss from the transmitting antenna and interference from adjacent cells. Therefore, satisfying QoS (Quality of Service) requirements of each MS at the cell boundary has been an important issue. To resolve this spectral efficiency problem at the cell boundary, deploying relay stations has been actively considered. As multihop/relay has complex interactions between the routing and medium access control decisions, the extent to which analytical expressions can be used to explore its benefits is limited. Consequently, simulations tend to be the preferred way of assessing the performance of relays. In this paper, we evaluate the performance of relay-assisted OFDMA networks by means of system level simulator (SLS). We consistently observed that the throughput is increased and the outage is decreased in the relay-assisted OFDMA network, which is converted to range extension without any capacity penalty, for the realistic range of values of the propagation and other system parameters investigated.

scholarly journals Performance of cooperative multi-hop multiuser relaying networks

2018 ◽  
Vol 15 (2) ◽  
pp. 213-224
Author(s):  
Aleksandra Panajotovic ◽  
Nikola Sekulovic ◽  
Aleksandra Cvetkovic ◽  
Daniela Milovic
Keyword(s):  
Spectral Efficiency ◽  
Error Probability ◽  
Scheduling Algorithm ◽  
Signal Transmission ◽  
Maximal Ratio Combining ◽  
Opportunistic Scheduling ◽  
Symbol Error Probability ◽  
Relay System ◽  
Cooperative Relays ◽  
Average Symbol Error Probability

This paper presents both capacity and error performances of cooperative multi-hop multiuser relay system. All multi-hop cooperative relays in the system apply maximal-ratio combining (MRC) scheme, while signal transmission to end users is carried out using opportunistic scheduling algorithm. Numerical results for spectral efficiency and average symbol error probability (ASEP) for considered system are presented and discussed.

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