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?
Reply by c.saagar●August 26, 20082008-08-26
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...