Patent ID: 6501803
Filing Date: 2002-12-31
Classification: H04B,H04L

Abstract:
A transmitter comprising:a trellis encoder that encodes incoming digital data to generate complex numbers representing constellation symbols defined as s0 and s1, wherein the trellis encoder transmits by a first antenna and a second antenna, respectively, during a first time or frequency interval; a space-block encoder responsive to the constellation symbols to encode two adjacent constellation symbols as a block comprising two trellis-coded symbols and two parity symbols chosen from a group consisting of negated trellis-coded symbols, complex conjugates of the trellis-coded symbols, and negative complex conjugates of the trellis-coded symbols, wherein the space-block encoder is adapted to feed two antennas such that a different symbol is transmitted by each antenna; and wherein the symbols âˆ’s1* and s0* are generated by the space-block encoder and transmitted by the first antenna and the second antenna, respectively, during a second time or frequency interval, wherein si* is defined as a complex conjugate of a symbol si.