A secure noma method based on physical layer security
AssigneeIstanbul Medipol Universitesi
InventorsAbdelrahman ABUSHATTAL, Hüseyin ARSLAN
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Abstract
Disclosed is a secure scheme that incorporates both internal and external eavesdroppers to secure all users' links in the downlink PD-NOMA. In particular, the proposed scheme implies that the BS induces a phase shift in each user's symbol based on its corresponding instantaneous channel phase. The phase shift of each user is restricted such that the original symbol is moved to the location of another symbol in the constellation diagram. Therefore, as each user is aware of its instantaneous channel phase only, it will be able to recover the actual phase of its corresponding symbol. Thus, the proposed scheme does not only protect the data against eavesdroppers, but it also guarantees confidentiality and privacy against all other users.
Claims5
A secure downlink NOMA method against an unknown internal eavesdropper, comprising:
- assigning different power levels for each user by a base station based on users' channel conditions,
- inducing a phase shift on each modulated symbol,
- merging and sending the superposed signal to the users from the base station,
- each user performs successive interference cancellation by detecting the other users' symbols starting with the first user until reaching its symbol by subtracting the detected symbol from the received signal at each iteration and carrying the resulting signal to the next iteration, and
- performing a phase shift to detect the confidential signal.
A secure uplink massive machine type communication NOMA method against an external eavesdropper, comprising:
- each user modulates their symbol to be delivered to a base station,
- shifting each symbol by a phase value,
- transmitting user signals according to allocated power to the base station,
- receiving signals from all the users simultaneously at the base station,
- detecting the signal of the strongest user and applying a phase shifter to demodulate the strongest user signal,
- applying iterative successive interference cancellation to detect the rest user signals, and
- applying a phase shift until detecting all user signals.
Dependencies are inferred from the claim text.