how can i obtains the SER for the system assuming the channels are known

Question

awais farooq 2022-1-10

编辑： Samhitha 2025-6-18

i want to get the SER for sytem for communication sytems assumingthe channels are known if anyone can help

Answer 1

Samhitha 2025-6-18

编辑：Samhitha 2025-6-18

To compute SER (Symbol Error Rate) for a communication system, assuming channels are known at the receiver, you follow these steps:

M = 16; % Example: 16-QAM 
numSymbols = 1e5; 
data = randi([0 M-1], numSymbols, 1); 

2. Modulate the symbols

txSymbols = qammod(data, M, 'UnitAveragePower', true);

3. Apply the channel (assume known)

H = (randn + 1j*randn)/sqrt(2); % Example: flat fading coefficient 
rxSymbols = H * txSymbols; 

4. Add noise

SNR_dB = 20; % Example SNR 
rxSymbolsNoisy = awgn(rxSymbols, SNR_dB, 'measured'); 

5. Equalize using known channel

rxEqualized = rxSymbolsNoisy / H;

6. Demodulate

rxData = qamdemod(rxEqualized, M, 'UnitAveragePower', true);

7. Compute SER

SER = sum(rxData ~= data) / numSymbols;

For more details, you may look into following documentation:

Hope this helps!