Patent ID: 6049572
Filing Date: 2000-04-11
Classification: H04L

Abstract:
A digital modulator comprising:primary frame-to-vector (F-V) mapper for generating one of a plurality of primary symbol vectors in an In phase and Quadrature (I-Q) signal space in response to a received primary frame of binary information, the primary F-V mapper utilizing a quadrature amplitude and phase shift keying modulation technique;auxiliary F-V mapper for generating an auxiliary vector in response to a received auxiliary frame of binary information, the auxiliary vector defining an endpoint in the I-Q signal space;point-to-point (P-P) mapper coupled to the auxiliary F-V mapper, for mapping points within a first area of the signal space into points within a second area of the signal space, the P-P mapper for transforming the endpoint within the first area into a mapped point within the second area, the mapped point defining a mapped auxiliary vector; anda vector adder coupled to the primary F-V mapper and to the P-P mapper, for generating a sum modulation vector by adding the primary symbol vector to the mapped auxiliary vector.