Communication device and method for signal determination in radio communication

A communication device, comprising:

• a receiver configured to receive a signal;
• a calculation circuit configured to determine a fourth order cumulant value from the received signal, to determine a function value of the determined cumulant value and to compare the determined function value with a predefined value;
• wherein the fourth order cumulant function is defined by C4x(t,t1,t2,t3)=cum(x*(t),x(t+t1),x(t+t2),x*(t+t3)), wherein t, t1, t2, and t3 are times, x(t) is a complex valued signal function of the time t based on the received signal, x*(t) is the complex conjugate function of x(t) and cum(x*(t),x(t+t1),x(t+t2),x*(t+t3)) is defined by cum(x*(t),x(t+t1),x(t+t2),x*(t+t3))=E(x*(t)x(t+t1)x(t+t2)x*(t+t3))−E(x*(t)x(t+t1))E(x(t+t2)x*(t+t3))−E(x*(t)x(t+t2))E(x(t+t1)x*(t+t3))−E(x*(t)x*(t+t3))E(x(t+t1)x(t+t2)), wherein E is an expectation value operator that if acting on an argument function determines an expectation value of the argument function;
• and
• a target signal detector configured to determine whether an information packet from a predefined radio communication protocol is present in the received signal based on the comparison of the determined function value with the predefined value.

A method for signal determination in radio communication, comprising:

• receiving a signal;
• determining a cumulant value of an order higher than two of the received signal;
• wherein the cumulant is a fourth order cumulant γ4x=E(|x|4)−2·(E(|x|2))2−(E((Re(x))2−(Im(x))2))2−(E(2·Re(x)·Im(x)))2, wherein x is a complex valued signal function based on the received signal, |x| is an absolute value x, (·)2 is a square of (·), E is an expectation operator that if acting on an argument function determines an expectation value of the argument function Re(x) is a real part of x and Im(x) is an imaginary part of x;
• determining a function value of the determined cumulant value;
• comparing the determined function value with a predefined value;
• and
• activating a decoder configured to decode the received signal based on the comparison of the determined function value with the predefined value.

A method for signal determination in radio communication, comprising:

• receiving a signal;
• determining a fourth order cumulant value of an order higher than two of the received signal;
• determining a function value of the determined cumulant value;
• wherein the fourth order cumulant function is defined by C4x(t,t1,t2,t3)=cum(x*(t),x(t+t1),x(t+t2),x*(t+t3)), wherein t, t1, t2 and t3 are times, x(t) is a complex valued signal function of the time t based on the received signal, x*(t) is the complex conjugate function of x(t) and cum(x*(t),x(t+t1),x(t+t2),x*(t+t3)) is defined by cum(x*(t),x(t+t1),x(t+t2),x*(t+t3))=E(x*(t)x(t+t1)x(t+t2)x*(t+t3))−E(x*(t)x(t+t1))E(x(t+t2)x*(t+t3))−E(x*(t)x(t+t2))E(x(t+t1)x*(t+t3))−E(x*(t)x*(t+t3))E(x(t+t1)x(t+t2)), wherein E is an expectation value operator that if acting on an argument function determines an expectation value of the argument function;
• comparing the determined function value with a predefined value;
• and
• determining whether an information packet from a predefined short-range radio communication protocol is present in the received signal based on the comparison of the determined function value with the predefined value.