In both Integer to Bit Converter and Bit to Integer Converter blocks, set the Number of bits per integer to 16 (this is related to the music file and not the modulation scheme).
The music file length is 62 second, so set the Simulation Time to 62 seconds.The music file that you will use (named Music-1.wav) is located on the Desktop.You will observe both constellations in the transmitter and the receiver sides and the Bit Error Rate. The following model will be used to simulate a music file transmission using 16 QAM modulation with AWGN channel. Run the simulation and observe the bit error rate and the number of transmitted samples from the Display block for both schemes, and observe the used bandwidth for both schemes from the spectrum analyzer block.Choose the same value of SNR for both AWGN blocks.For the 16 QAM Modulator and Demodulator blocks, use Gray Constellation ordering, set the Normalization method to Peak Power, and set the Peak Power value to 1 Watt.Set the sample time to 0.25e-6 and the Samples per frame to 1024.
MATLAB 64 QAM GENERATOR
Double click on the Bernoulli generator for the 16 QAM part.Set the sample time to 0.5e-6 and the Samples per frame to 1024. Double click on the Bernoulli generator for the QPSK part.Set the sample time to 1e-6 and the Samples per frame to 1024.
MATLAB 64 QAM CODE
Therefore, Gray code is preferable over Binary code, since if a receiver maps a symbol to one of its adjacent symbols (due to noise or errors), it will lead to 1 wrong bit instead of 2. In Gray code, two adjacent symbols differ in one bit, while in Binary code, two adjacent symbols may differ in 2 bits. Note: in QAM, BER curve sometomes goes down than the theoretical one, which is not ture, but i can't fixed it till know.As in QPSK, there are two ways (codes) to map the symbols to the constellation points: Binary code and Gray code. Here instead of changing the phase we change the frequency. Tuning Paramtersįollowing the same idea we know can transfer more bits per symbol. and clearly, the advantage is higher data rate.įor maximum seperation beetween offsets here, it will be 90 degree. What if we want the symbol to be represented by more than just one bit -or in case the symbols set includes more than two symbols-, then we use QPSK that allows to transfer two bits of data per symbol. The simplest one this family is BPSK where 'binary' refers to the use of 2 phase offsets -one for the logic high and the other for logic low, that's why we just need 1 bit per symbol-and the best case is to have the maximum difference between these offset which is 180 degree. In general it's the idea of sending different symbols in same amplitude and frequency, carrier frequency, but with different phases. Where EbNo, maxNumErrs and maxNumBits are variables in the base workspace Input samples per symbol & Output samples per symbol: 2.
In case of using the Raised Cosin Filter, I choose the following values: Digital-Communications-Matlab-Simulink-ProjectĪ Simulation for the performance of different modulation schemes, BPSK, QPSK, FSK, QAM(16-64) in an AWGN environment.