Code Division Multiple Access Wireless System With Closed Loop Mode Using Ninety Degree Phase Rotation and Beamformer Verification

A method of receiving a wireless communication signal, comprising the steps of:

• receiving a sequence of known signals from a remote transmitter;
• calculating a respective coefficient corresponding to each of the known signals, wherein the phase of each said respective coefficient is rotated by 90 degrees with respect to a next coefficient of the sequence;
• and
• producing a logic signal having a value corresponding to a position in the sequence and to the rotation of said respective coefficient;
• and
• sending the logic signal to the remote transmitter.

A method of producing a phase angle in a wireless receiver, comprising the steps of:

• receiving a known signal corresponding to one of an even and an odd time slot from a remote transmitter;
• calculating a measurement having real and imaginary parts corresponding to the known signal;
• determining the phase angle is 0 when the real part of the measurement is positive in an even time slot;
• determining the phase angle is it when the real part of the measurement is negative in the even time slot;
• determining the phase angle is −7t/2 when the imaginary part of the measurement is positive in an odd time slot;
• determining the phase angle is 7t/2 when the imaginary part of the measurement is negative in the odd time slot;
• and
• calculating a channel estimate from the remote transmitter in response to the phase angle.

A method of calculating an estimated value in a wireless receiver, comprising the steps of:

• receiving at least one channel estimate;
• receiving a known signal corresponding to one of an even and odd time slot from a remote transmitter;
• calculating a product of the at least one channel estimate and the known signal, the product having real and imaginary parts;
• determining a phase angle is 0 when the real part of the product is positive in an even time slot;
• determining the phase angle is 7c when the real part of the product is negative in the even time slot;
• determining the phase angle is −n/2 when the imaginary part of the product is positive in an odd time slot;
• and
• determining the phase angle is 7c/2 when the imaginary part of the product is negative in the odd time slot.

A method of calculating an estimated value in a wireless receiver, comprising the steps of:

• receiving at least one channel estimate;
• receiving a known signal from a remote transmitter;
• calculating a product of the at least one channel estimate and the known signal;
• rotating the product by a plurality of phase angles, thereby producing a constellation of values, each value of the constellation of values having real and imaginary parts;
• detecting a maximum real part from the real part of each value of the constellation;
• and
• producing the estimated value in response to the maximum real part.