Abstract: Wireless circuitry can include a processor that generates a baseband signal, an upconversion circuit that upconverts the baseband signals to a radio-frequency signal, and an amplifier that amplifies the radio-frequency signal. A tunable delay circuit can be used to selectively delay generation of the radio-frequency signal or to delay generation of another signal intended for the radio-frequency amplifier. The tunable delay circuit can be controlled using a closed-loop delay adaptation scheme. A feedback receiver that is coupled to an output of the amplifier can be used to generate a demodulated signal. A delay error measurement circuit can be used to receive the demodulated signal, to detect a peak by monitoring when an envelope of the demodulated signal crosses a threshold level, to compute an amount of asymmetry in the detected peak, and to output a signal that is used to control the tunable delay circuit.

Abstract: A battle simulation system includes a limb immobilization device. The limb immobilization device is operative for immobilizing a limb of a user in response to receipt of the control signal indicating a hit to the limb of the user. The limb immobilization device may at least partially immobilize the limb. The immobilization may be voluntary or involuntary.

Abstract: A battle simulation system includes a limb immobilization device. The limb immobilization device is operative for immobilizing a limb of a user in response to receipt of the control signal indicating a hit to the limb of the user. The limb immobilization device may at least partially immobilize the limb. The immobilization may be voluntary or involuntary.