Implementation using DSP and FPGA in a CDMA project

[eng.]

CDMA

i am working on a cdma project and i want to compare between
the implementation using dsp(TMS320C6711 DSP Starter Kit)
and fpga (Spartan3 Starter Kit),what is the max. bit rate that a
TMS320c6711 can support?(i am a beginner)

thanks in advance

 

[brmadhukar]

Re: CDMA

Hi,
I have worked on FPGA and ADSP on the cdma technologies. An FPGA can support a significantly higher data rate than the DSP for obvious reasons. I know of an implementation on a TI processor that supported 19.6kBps. So I expect double that can be done now frow what was possible 2 years back.

However I would have preferred an FPGA solution.

B R M

 

[djalli]

CDMA

There is a toolbox for TI DSP processors in 6.5 version of Matlab.

 

[jayakumarjay]

Re: CDMA

have anyone working in cdma asic chip design

if yes which architecture is best for low power

 

[kk_10]

Re: CDMA

I have worked on FPGA and ADSP on the cdma technologies. An FPGA can support a significantly higher data rate than the DSP for obvious reasons. I know of an implementation on a TI processor that supported 19.6kBps.

 

[QuIcK-SiLvEr]

Re: CDMA

@eng

well if u are to use Spartan starter kit for implementation …u must make sure how many gates it has..It depends XC3S200 has 2 million gates and .this means u cant implement a virtebi decoder on it which takes 37.8% space of XC3S1000(10 Million gates).Similarly a single channel 64 tap FIR filter takes 3% on XC3S1000.This means we have to plan in advance how many filters we are going to use..the starter kit has....I have a document over it which tells more stats like these.im putting it in the links section...

My question for eng. Is. Do u think ur spartan3 kit is enough for CDMA?Im asking u because Im myself working over it but I have a XC3S200 and im thinking of purchasing something with a lot more space like xc3s1000..What model are u using..

 

[nj_jack]

CDMA

designing CDMA is a complex process, about IF and baseband you can use FPGA and DSP to implement it, meanwhile you can recur to several special chips.
they can simplify your design.

 

[mami_hacky]

CDMA

Dear eng. I'm wondering if you can define your problem completely. Do you want to have just CDMA coding? or a complete communication system based on CDMA? ( such as one of the available standards like CDMA2000? ) I think that the difference is too high.
do you have modulation / demodulation circuits?
do you have pulse shaping?
do you use a channel equalizer?
these are important.

 

[spweda]

Re: CDMA

The chip level processing(despreading) usually needs FPGA or ASIC. After despreading, the symbol processing(Rake receiver, Viterbi/Turbo decoder. speech codec) could be implemented in DSP. What is your reference system? 3GPP2 CDMA or W-CDMA, mobile or base station receiver? The CDMA system implementation involves a lot people efforts and it should be a big project.

 

[the_jackal]

Re: CDMA

FYI, the 72kB of internal program memory of the TMS320C6711 processor is structured so that a total of 8 instructions can be fetched every clock cycle. Eg. with a clock rate of 200MHz, the TMS320C6711 is capable of fetching 8 32-bit instructions every 1/(200) seconds.

spweda, the system is CDMA as mentioned in the earlier post!

 

[as_518]

Re: CDMA

[/Dear eng. I'm wondering if you can define your problem completely. Do you want to have just CDMA coding? or a complete communication system based on CDMA? ( such as one of the available standards like CDMA2000? ) I think that the difference is too high.
do you have modulation / demodulation circuits?
do you have pulse shaping?
do you use a channel equalizer?
these are important.]


i have a cdma modulated digital signal i want to transmitt it in rf do you have some solution

 

[salman.telecom]

CDMA

I also want to implement cdma rake receiver on dsp but the stuff on it is too less for me to start working on it. I need help of you people.

thanks in advance!!