Error Probability For Qpsk In Rayleigh Fading
Contents |
and QPSK in an AWGN channel. Now we turn our attention to a Rayleigh fading channel which is a more realistic representation of a wireless communication channel. We consider a single tap Rayleigh fading channel which ber for qpsk in rayleigh channel is good approximation of a flat fading channel i.e. a channel that has flat probability of error in qpsk frequency response (but varying with time). The complex channel coefficient is given as (a+j*b) where a and b are Gaussian random variables with bit error rate rayleigh fading channel mean 0 and variance 0.5. We use the envelope of this channel coefficient in our simulation as any phase shift is easily removed by the receiver. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% function[ber]=err_rate3(l,EbNo) si=2*(round(rand(1,l))-0.5); sq=2*(round(rand(1,l))-0.5); s=si+j*sq; n=(1/sqrt(2*10^(EbNo/10)))*(randn(1,l)+j*randn(1,l)); h=(1/sqrt(2))*((randn(1,l))+j*(randn(1,l))); r=abs(h).*s+n; si_=sign(real(r)); sq_=sign(imag(r)); ber1=(l-sum(si==si_))/l;
Symbol Error Rate Definition
ber2=(l-sum(sq==sq_))/l; ber=mean([ber1 ber2]); return %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% It is observed that the BER for a Rayleigh fading channel is much higher than the BER for an AWGN channel. In fact, for Rayleigh fading, the BER curve is almost a straight line!!! Rayleigh Fading Note: 1. The input EbNo to the function is in dB so it is converted into linear scale by 10^(EbNo/10). 2. Noise is added in a Rayleigh fading channel as well. Noise is introduced bit error rate for qpsk matlab code by the receiver front end and is always present. Post navigation ← Bit Error Rate of QPSK Equal Gain Combining in Rayleigh Fading → 14 thoughts on “Bit Error Rate of QPSK in Rayleigh Fading” karan says: June 23, 2016 at 5:45 am ??????????? karan says: June 16, 2016 at 7:12 am hello sir I want your help. i want matlab code of ber vs snr plot with bpsk,qpsk and 16qam modulation with mrc, egc and sc in mmse sic receiver Jalovas says: June 15, 2016 at 5:58 am Thank you for your answer. If it is convenient for you , I still have some questions. How do i know that h is a time varying channel ? Because of using matlab function "randn" ? In wireless communication simulation , what situation channel coefficient has only one component ( or multiple components )? Does it relate to multiple paths or symbol period ? I am grateful for your help. Thanks a lot. John says: June 12, 2016 at 5:47 pm When channel has only one component (that is FIR filter has only one coefficient) convolution in equivalent to multiplication. Such is the case when the symbol period is much longer than the channel length (in time). John says: June 12, 2016 at 5:45 pm ht is a static channel model, coefficients are
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