8-PSK Modulation with Gray encoding

Write a MATLAB program that takes as input a bit stream of arbitrary length and produces a time-domain plot of the 8-PSK modulated signal. The input bit sequence may be padded with extra zeros as needed. Additional parameters such as the carrier frequency fc, symbol energy Es, symbol interval T, phase offset ζ0, should also be specified as input parameters where appropriate. For each modulation scheme, demonstrate your code using the following bit sequence: 010100010011001.