Amplitude shift keying modulation

Hellow ,

how are you all ?!

i have to build a digital communication system with the following properties :

1. The input signal is a speech signal (BW is 4KHz)
2. Ideal sampling at nyquist rate
3. Use uniform quantization with 2^8 levels
4. Apply 8 bit encoder
5. Use ASK modulation
6. Send the signal over AWGN with signal-to-noise ratio of 0dB, 1dB, 10dB
7. Build an optimal receiver to detect the Tx signal .
8. Play the speech signal on speakers .

can anyone help ?!

[Walter Roberson]

Which part did you get stuck on? What code do you have so far?