TY - GEN
T1 - Power optimization and kth order selective relaying in free space optical networks
AU - Hussain, Syed Imtiaz
AU - Abdallah, Mohamed M.
AU - Qaraqe, Khalid A.
PY - 2013
Y1 - 2013
N2 - Free space optical (FSO) communication is a promising technology to break the spectrum gridlock by exploiting the unregulated optical bands. Regardless of its many advantages, FSO severely suffers from poor performance over medium to long range links. This could be overcome by deploying relays in the system in serial or parallel fashion. For a dual-hop FSO system with multiple parallel relays, all-relay communication needs perfect synchronization among the participating relays, resulting in a very complex transmission process. This may be avoided by selecting a single relay based on a certain metric. However, due to peak and/or average power constrains in the system, power optimization among few 'best' relays may provide an optimum performance. In this paper, we first investigate selective relaying in an FSO system with parallel relays operating in amplify-and-forward (AF) mode under log-normal fading. We derive outage probability of the system in case a single relay is selected on the basis of maximum end-to-end signal to noise ration (SNR). The latter part of the paper discusses a power optimization technique among few relays with peak and average power constraints. Simulation results show that in the absence of power constraints single relay selection performs better whereas power optimization among few selected relays is more efficient with power constraints.
AB - Free space optical (FSO) communication is a promising technology to break the spectrum gridlock by exploiting the unregulated optical bands. Regardless of its many advantages, FSO severely suffers from poor performance over medium to long range links. This could be overcome by deploying relays in the system in serial or parallel fashion. For a dual-hop FSO system with multiple parallel relays, all-relay communication needs perfect synchronization among the participating relays, resulting in a very complex transmission process. This may be avoided by selecting a single relay based on a certain metric. However, due to peak and/or average power constrains in the system, power optimization among few 'best' relays may provide an optimum performance. In this paper, we first investigate selective relaying in an FSO system with parallel relays operating in amplify-and-forward (AF) mode under log-normal fading. We derive outage probability of the system in case a single relay is selected on the basis of maximum end-to-end signal to noise ration (SNR). The latter part of the paper discusses a power optimization technique among few relays with peak and average power constraints. Simulation results show that in the absence of power constraints single relay selection performs better whereas power optimization among few selected relays is more efficient with power constraints.
KW - amplify and forward
KW - free space optical
KW - log-normal fading etc
KW - power optimization
KW - relay selection
UR - http://www.scopus.com/inward/record.url?scp=84893545822&partnerID=8YFLogxK
U2 - 10.1109/IEEEGCC.2013.6705799
DO - 10.1109/IEEEGCC.2013.6705799
M3 - Conference contribution
AN - SCOPUS:84893545822
SN - 9781479907243
T3 - 2013 7th IEEE GCC Conference and Exhibition, GCC 2013
SP - 330
EP - 333
BT - 2013 7th IEEE GCC Conference and Exhibition, GCC 2013
T2 - 2013 7th IEEE GCC Conference and Exhibition, GCC 2013
Y2 - 17 November 2013 through 20 November 2013
ER -