Low complexity relay selection and power allocation scheme for cognitive mimo buffer-aided decode-and-forward relay networks

A method for relay selection within a cognitive radio network, the method being performed by a processor, the method comprising:

• identifying one or more primary source devices and primary destination devices within a primary network of the cognitive radio network;
• identifying one or more secondary source devices and secondary destination devices, and a predetermined number of cognitive relays within a secondary network of the cognitive radio network;
• transmitting data packets from the primary network for every time slot during network operation on a continuous basis;
• and
• selecting a source relay link or a relay destination link within the secondary network to transmit predetermined data based on a modified Max-Link relay selection with set criterion of
• R
• i
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• o
• pt
• =
• max
• i
• 
• (
• R
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• ,
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• +
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• where RSp,Rp(1) and RSp,Rp(2) are the normalized rates of the primary network, Rs,Ri is the channel matrix for a link between source and relay i, and RRi,D is the channel matrix for a link between relay Ri and destination D,
• wherein the one or more primary source devices, primary destination devices, secondary source devices, secondary destination devices and cognitive relays are multiple-input multiple-output (MIMO) devices.

A non-transitory computer readable medium having stored thereon a program that when executed by a computer, causes the computer to execute a method of relay selection within a cognitive radio network, the method comprising:

• identifying one or more primary source devices and primary destination devices within a primary network of the cognitive radio network;
• identifying one or more secondary source devices and secondary destination devices, and a predetermined number of cognitive relays within a secondary network of the cognitive radio network;
• transmitting data packets from the primary network for every time slot during network operation on a continuous basis;
• and
• select a source relay link or a relay destination link within the secondary network to transmit predetermined data based on a modified Max-Link relay selection with set criterion of
• R
• i
• 
• o
• pt
• =
• max
• i
• 
• (
• R
• S
• p
• ,
• R
• p
• (
• 1
• )
• +
• R
• S
• ,
• R
• i
• ,
• 
• R
• S
• p
• ,
• R
• p
• (
• 2
• )
• +
• R
• R
• i
• ,
• D
• )
• ,
• where RSp,Rp(1) and RSp,Rp(2) are the normalized rates of the primary network, Rs,Ri is the channel matrix for a link between source and relay i, and RRi,D is the channel matrix for a link between relay i and destination, D.
• wherein the one or more primary source devices, primary destination devices, secondary source devices, secondary destination devices and cognitive relays are multiple input multiple output (MIMO) devices.