ITERATIVE DECODING FOR DIFFERENTIAL MIMO SYSTEMS WITH NEAR- COHERENT PERFORMANCE

A toy police car includes a two-level cam, a sound assembly, a signal control assembly, a projection assembly, and a helicopter. The two-level cam includes an upper cam and a lower cam and is driven indirectly by an electric motor and a series of gears. The upper cam drives the projection assembly to project toy figures out of the car doors and a return spring causes the toy figures to return to their original position. The lower cam urges a push rod which controls the upward movement of the helicopter and another return spring causes the helicopter to return to its original position. The sound assembly is activated by the push rod to generate several sound effects. Another cam, indirectly driven by the motor, impinges an activation arm to control signal lights.