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Recent content by puripong

  1. P

    2x2,3x3,4x4 MIMO ML or sphere decoder performance ???

    normalize channel power to unity
  2. P

    2x2,3x3,4x4 MIMO ML or sphere decoder performance ???

    For spatial multiplexing MIMO, 4x4 is better than 3x3 3x3 is better than 2x2
  3. P

    BPSK BER in rayleigh IN MATLAB : why noise and channel is the same in matlab.

    Re: BPSK BER in rayleigh IN MATLAB : why noise and channel are the same in matlab. In this case, if the average power of transmitted symbol is 1. The SNR is 0 dB You can scale the power of noise with some factor and this changes SNR.
  4. P

    Questions about MIMO system

    Thank you very much for your reply In MIMO, I think that we face more interference from more antenna. So I have asked for error rate of NxN compared with 1x1.
  5. P

    Questions about MIMO system

    Hi, I would like to ask the questions on MIMO :-D We can double the data rate by using 2x2 MIMO (comparing with SISO). So we will get N-time higher data rate if we use NxN MIMO. Am I right ? If I use the maximum likelihood detection what about the BER of 2x2 and NxN ? Is it the same ? Thanks...
  6. P

    Error rate in AWGN: why mean=0, variance = No/2 ?

    Function rand is used to generate uniformly-distributed random values whereas function randn is for Gaussian-distributed random values. I think this term [rand(1,N)+j randn(1,N)]) is complex Gaussian random value So the variance (you may think it as power) of its is equal to 2 In matlab, you...
  7. P

    Error rate in AWGN: why mean=0, variance = No/2 ?

    AWGN is additive white Gaussian noise. Its mean is zero according to Gaussian distribution. No/2 is noise power I'm not sure about actual meaning of No/2 but I think the power of real signal spreads over negative and positive frequency. So, No/2 stands for two-sided power spectral density. In...
  8. P

    Regarding the simulation of QAM on Rayleigh fading channel

    Hi, I am very new in wireless systems I have tried to simulate QAM on Rayleigh fading channel This is a mathematical model of Rayleigh fading channel y = hx + n where y = complex receive vector h = channel gain according to Rayleigh fading x = complex transmit vector n = complex AWGN noise...
  9. P

    Decoding algorithm for LDPC over GF(q)

    Systematic form : The last k bits or first k bits of codeword is the message bits. k = number of message bit ?
  10. P

    Decoding algorithm for LDPC over GF(q)

    The codewords of LDPC code are in systematic form
  11. P

    How to generate the generator matrix?

    Generator Matrix I think the minimum distance is the rule of creating G
  12. P

    how to construct quasi cyclic LDPC code

    Hi, Check this "LDPC Block and Convolutional Codes Based on Circulant Matrices" **broken link removed** Section2 provides a method to construct quasi cyclic ldpc codes along with examples. :D
  13. P

    Summing of outpus in matlab

    a = []; for i1 = 1 : 1 : 5 a = [a rand]; end avg = sum(a)/5 :)
  14. P

    I need books on O(optical)OFDM!

    My question is 'How to model and simulate the optical channel ?' I need some reference books Could you please suggest me Thanks
  15. P

    how i can create a mat file !!!!!

    save your_file_name.mat your_variable
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