need bpsk modulation and demodulation code in matlab

Hello,


I need simple matlab program for bpsk modulation and demodulation

Thanx

length = 1000 ;
Stream = randint(1, length) ;
Mod = 2*Stream -1 ;
SNR = 10 ;
Recv = awgn(Mod, SNR) ;
Demod = (Recv >= 0) ;

can you explain the program to me.... I am new to matlab..... please explain what does each statement in the program mean...


Thankx

---------- Post added at 10:40 ---------- Previous post was at 10:25 ----------

The flow of my program for BPSK modulation is as follows:

1. Mention data sequence

2. Convert it using NRZ encoding

3. Mention bit duration, carrier frequency

4. Multiply the above signal with a reference oscillator having carrier frequency w.

5. Thus, BPSK signal is generated

The above flow has been in accordance with the block diagram of bpsk modulation. Similarly, I need matlab program for bpsk demodulation according to the block diagram of bpsk demodulation. I also need QPSK modulation and demodulation matlab codes according to the basic block diagram of QPSK modulation and demodulation. Kindly explain the steps involved in the program as I am new to matlab.

Thanx.