Re: [Discuss-gnuradio] benchmark_tx(rx).py throughput as modulation

[SangHyuk Kim]

Thanks Marcus.

given parameters : 
bit rate = 100,000

samples per symbol = 2

constellation = 16

then, 

bits per symbol = log2(16) = 4

symbol rate = bit rate / bits per symbol = 100,000 / 4 = 25,000

sample rate = samples per symbol * symbol rate = 2 * 25,000 = 50,000

also, as I know, sample rate = bandwidth. so, bandwidth is 50KHz right ?

Q1. what is difference between sample rate and samples per second ?

Q2. USRP N210 maximum sample rate = 25 MS/s, CBX daughterboard analog bandwidth = 40 MHz. what is the maximum bandwidth ?

Thank you again!

2016-03-02 15:51 GMT+09:00 Marcus Müller <address@hidden>:

Hi,

> I think it is up to bit rate, but I don't know exactly what it is.

The number of bit per second you're going to be transmitting/receiving. It's (symbol rate) *  (bits per symbol). "bits per symbol" is of course log2(constellation points).

> Is there unlimited bit rate option for check to modulation throughput ?

No, a given modulation with a given sample rate and a given samples per second must result in a fixed transmission rate.

Best regards,
Marcus

On 02.03.2016 06:47, SangHyuk Kim wrote:

Hi all.

I'm using benchmark_tx.py and rx (/digital/example/narrowband)

As I know, ex) QAM modulation is faster than BPSK one.

However, when I used both of modulation schemes, I couldn't measure throughput.

I think it is up to bit rate, but I don't know exactly what it is.

Is there unlimited bit rate option for check to modulation throughput ?

Thanks.

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