Efficient Chip Design for Pulse Shaping

This note presents a new idea for implementing the pulse shaping filter in the transmitter part of a modem. It will be shown that for QPSK modulation and other higher order modulations like 16/32/64 QAM no multiplication is required at all while the number of multiplications for 8PSK (and 16/32PSK) can be reduced to a very small number that is independent of the amount of coefficients necessary for implementing the filter function. Implementation results are reported obtained by Synopys FPGA compiler and Altera MAXPLUS2 software.