On the performance of combined Quadrature Amplitude Modulation and convolutional codes for cross-coupled multidimensional channels.
01 January 1986
The performance of cross-coupled, M-ary Quadrature Amplitude Modulation (QAM) systems is determined when bandwidth efficient trellis codes are bat interference. Performance with and without compensation for cross-coupled interference is presented. It is found that simple trellis codes can maintain the error probability at an acceptable level for cross-coupling parameters that render uncoded systems unusable. Up to two dimensional trellis codes are considered for four dimensional QAM signals and possibilities of obtaining diversity advantages in form of higher total system throughput by prolonged availability of the two signals are explored.