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78 Threads found on Ber Performance
hi, I am trying to understand STBC and Alamouti scheme. However, i am very confused about the ber of such systems. Referring to the performance results in Alamouti and Tarokh's papers, for QPSK (for example), the ber/SER shown is against SNR for 2 bit/sec/hz. 1- what does the "per hz" mean here? 2- why do we use SNR here instead (...)
Yes. In principle, mXn MIMO have m*n diversity order, which means your ber~SNR plot will have slope of m*n at high SNR. You are refer to David Tse's famous paper for theoretical background. The introduction suffices.
This is really up to your needs. If you focus on uncoded systems, you just look at the ber out of detector. For example, when you design a space-time code and want to see how much diversity the code can achieve, you look at uncoded ber. If you study certain kind of channel code, Turbo code, LDPC, etc., you need to know how close your code is
hi guys i need simulation in matlab for cdma...ds-cdma and mc-cdma..all sort of simulations related to ber plots,performance in fading channels, AWGN channel and in different you know where i can find them or if anyone has got them, could you please kindly upload them
I have simulated Alamouti schemes for BPSK and 16QAM. The results for the Alamouti scheme wiht BPSK modulation are qute good but the one with 16QAM modulation are really bad. I have compared the Alamouti scheme with 16QAM modulation with simple SISO (16QAM). THe performance of Alamouti is really bad (SNR vs ber). Could anyone plz help me out in t
Hello, I've been trying to apply Viterbi to 8-DPSK and I do not find an enormous amount of references, not even about how much I could gain in performance compared to a ususal non-coherent receiver... would anyone know where to point me to? Thanks in advance, ;)
Hi In MIMO case with the increase of Number of antennas the ber performance also improving .Why it is improving? Plz explain me How? Thanks in Advance
I think the noise is related to the bluetooth antenna efficiency , cause the ber is high . I think you can improve the bluetooth antenna performance . Best Regards !
Salam STBC(Space Time Block Code) and STTC(Space Time Trellis Code) with common parameters and good design are the same in diversity gain, but STTC has coding gain and STBC dosnt have coding gain. then STTC has better performance(better ber) than STBC. but it is more complex. then it depend on application and ber (...)
could any one post a clear figure of ber vs Eb/No
Hello, Sorry, it seems little bit not understandable for me. Do you mean S11 amplitude and phase ? Shall I do that in Matlab as an example? is there any general relation between group delay and bit error rate even for the system? I think there should be some limit in group delay for specific ber, am I right ??
Hello, After modulating using QPSK the spectrum of modulated signal decrease as (sinc(pi*f*T))^2. In order to decrease the interference with adjacent channels we can use a BPF on the modulated signal. Does you know if this filtering changes the ber performance of the modulated QPSK ? Any formula or book ? Thankx
to my knowledge, ber performance of MMSE is not characteristized yet. In general, the average ber calculation involves intergration over SNR, but SNR for MMSE is not readily available.
The phase noise affects the performance of OFDM in a non-linear manner. You should model the phase noise model and get the ber v.s variance of noise phase.
Attached figure compared the ber performance between (binary) unipolar signaling and bipola signaling. We see that bipolar is better than unipolar. My question is that since their only difference is shift in DC voltage level, why it is meaningful to compare them? Why it is meaningful to compare their ber at same Eb level?
Hello! Thanks for your andwer! I'd like to transmit binary data e.g {-1,1}. If the noise has 0 mean and sqrt(N0) standard deviation, and Eb=1 then is that suitable calculation you wrote me for theoretical ber? Thommer
I use ADS ptolemy to simulate PHS RF system with DSP. I create PI/4 DQPSK modulator and demodulator, RF superheterodyne receiver, ber block. When I perform sensitivity simulation, I found an odd phenomenon. When I reduce bandwidth of the image rejection filter in RX according to the real filter performance ,ber performance (...)
Hi kibrun, Remarks or suggestions: 1) Manchester is not better than NRZ in ber theoretical performance (ber vs. Eb/No with perfect synchronization), but the fact of having at less one transition per bit improves the bit synchronization at the receiver, and this improves performance especially with nonrandom data. (...)