CDMA RAKE Receiver Simulation MATLAB.....Channel Impulse Response.....??

Hello everyone,

I am a noob in DSP n in MATLAB. Well i hv been workin on the simulation of
Rake Receiver using MATLAB. What I have done so far is this:

1. Generated an input random sequence of 8 bits.
This input sequence simulates the information signal to be sent to the
channel for retrieving by the RAKE receiver.

>> input_bit = fix(2*rand(1,8));
>>input_bit_polar = (2*input_bit - 1); % input signal in antipodal form

2. Created a 32 bit PN sequence n 8 x 8 Walsh Code matrix.

>> W1 = [0];
W2 = [W1 W1; W1 W1];
W4 = [W2 W2; W2 W2];
W8 = [W4 W4; W4 W4];


The Walsh code sequence needs to be separated into the I and Q-channel for
QPSK modulation.

>> Wodd = Wcode(1:2:length(Wcode)); % Walsh code for I-channel
Weven = Wcode(2:2:length(Wcode)); % Walsh code for Q-channel

3. I hv exored the PN sequence with a certain Walsh matrix row say Row2.

>> PNseq_I = fix(2*rand(1,length(bit_stream)*4)); % PN sequence for the
I-channel
PNseq_Q = fix(2*rand(1,length(bit_stream)*4)); % PN sequence for the
Q-channel

4. Then then i obtained a complex baseband in the end in the form
real + imag*j

Now i want to generate a channel impulse response which is fading
(multipath) channel so that i can convolve it with this complex baseband
signal. SO How should i generate it???

And what sort of channel estimation technique should I use for the same?

Eagerly Waiting for ur reply.....

Best Regards,

Saagar...

On Aug 26, 8:51*am, "c.saagar" <c.saa...@gmail.com> wrote:
>
> Now i want to generate a channel impulse response which is fading
> (multipath) channel so that i can convolve it with this complex baseband
> signal. SO How should i generate *it???

What kind of channel do you want to simulate? Indoor? Outdoor?
Mobile?
What carrier frequency, what environment?