Signal design for transmitter diversity wireless communication systems over Rayleigh fading channels

In this paper, transmitter diversity wireless communication systems over Ra yleigh fading channels using pilot symbol assisted modulation (PSAM) are st udied. Unlike conventional transmitter diversity systems with PSAM that est imate the superimposed fading process, we are able to estimate each individ ual fading process corresponding to the multiple transmitters by using appr opriately designed pilot symbol sequences. With such sequences, special cod ed modulation schemes can then be designed to access the diversity provided by the multiple transmitters without having to use an interleaver or expan d the signal bandwidth, The notion of code matrix is introduced for the cod ed modulation scheme, and its design criteria are also established. In addi tion to the reduction in receiver complexity, simulation results are compar ed to, and shown to be superior to, that of an intentional frequency offset system over a wide range of system parameters.