Patent Document ID: 10069592
Application ID: 15336070
Patent Flag: 1

Claim One:
1. A resource-efficient distributed friendly jamming (FJ) system for secure wireless communications, the FJ system comprising: (a) two or more wireless links, each wireless link comprising a transmitting mobile device and a corresponding receiving mobile device, wherein each wireless link independently accomplishes a transmission and a reception of an information signal in the presence of one or more eavesdroppers, wherein each transmitting mobile device transmits the information signal to the corresponding receiving mobile device, wherein each transmitting mobile device is aware of a location of the corresponding receiving mobile device, wherein each receiving mobile device has a secrecy rate, where the secrecy rate is a data rate at which the information signal can be securely received by a receiving mobile device when the one or more eavesdroppers of unknown locations is present; and (b) a precoder embedded in each transmitting mobile device, wherein the precoder utilizes a set of signal processing algorithms for precoding the information signal before transmission to the corresponding receiving mobile device, wherein each transmitting mobile device transmits an artificial noise (AN) signal (for friendly jamming) along with the information signal to the corresponding receiving mobile device, wherein each precoder utilizes the set of signal processing algorithms for precoding the AN signal before transmission to the corresponding receiving mobile device, wherein each AN signal is precoded such that an interference effect at the corresponding receiving mobile device is nullified but the interference effect at any other receiving mobile device is nonzero, wherein, for a single wireless link of the two or more wireless links, as a power of the AN signal is increased at the transmitting mobile device the secrecy rate of the corresponding receiving mobile device is also increased, wherein said increase in the power of the AN signal of the single wireless link causes a decrease in the secrecy rate of other wireless links in the system, resulting in a penalty (price) imposed on each transmitting mobile device when sending an AN signal to the corresponding receiving mobile device, wherein the transmitting mobile device pays a higher penalty for increasing the power of the AN signal, wherein each transmitting mobile device competes to maximize a utility function, where the utility function is the secrecy rate (within a given wireless link) minus the price paid for generating the AN signal, wherein at equilibrium, a reduction in the power of the AN signal increases a sum of the secrecy rates of other receiving devices in the system.