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Recent content by carpa

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    Need Help: A Statistical Theory of Mobile Radio Reception

    a statistical theory of mobile-radio reception I once read it in library and I think it's too old that no electronic version is available. I think you are interested in channel modeling and many books recently published represent the same CLARK model. One reference book is : Wireless...
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    What exactly is a Hybrid IC?

    What is a Hybrid IC It seems that hybrid IC is not a academic name. Maybe it should be understood from its context.
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    about the MMSE channel estimation in OFDM

    LMS is the simplest adaptive one which is used frequently for channel equalization and estimation.
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    relationship between power spectral density and variance

    variance spectral density Acturely AWGN does not exist in reality because AWGN should have constant PSD and infinity bandwidth, which will lead to an ridiculous result that AWGN has infinity power. When we consider white noise we always constrain it into some specific bandwidth B (SSB...
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    What is intermodulation in antenna?

    Intermodulation Intermodulation comes from unlinearity of devices, which will generate some frequency sums or differences of the incoming tones.
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    about the MMSE channel estimation in OFDM

    This matrix is usually used for mathematical analysis which reveals the BEST results under some assumptions. In real implementation adaptive algorithoms are more attractive which avoids matrix calculation and inversion.
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    Are gaussian distributed noise always white noises in awgn channel?

    uncorrelated awgn The answer is "NO". Distribution does not concern anything about time or frequency. Gaussion noise can have any power spectrum shape, and the very special one of it is white.
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    biginer in communication

    It depends which point you begin from. At least several mathematical books should be in your bookshelf such as matrix, stachastic process, further reading contains the signal an system, etc.
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    How is MSE of OFDM channel estimation calculated?

    channel mse estimation In OFDM channel estimation, channel is estimated in frequency domain. Is MSE of the estimation calculated also in frequency domain? And if in fast fading OFDM channel, ICI exists and channel cannot be represented in frequency domain (symbol by symbol) correctly, how...
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    Source Coding for Digital Communication

    Source Coding. arithdeco - Decode binary code using arithmetic decoding. arithenco - Encode a sequence of symbols using arithmetic coding. compand - Source code mu-law or A-law compressor or expander. dpcmdeco - Decode using differential pulse code modulation...
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    Is the noise output of a mached filter white?

    digital matched filter For a matched filter, although the input noise is white, the output of it is not. However, many papers talking about communication signal processing assume that n(t) at the output of the matched filter is Gaussion and WHITE. Is that right? Or just for simplicity?
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    Help me with project on wireless communication using Verilog

    wireless communications Which specific area are you interested? PHY level or MAC level or even higher? So only if you could give the specific topic can one help you.
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    How does this code plot eye diagram?

    Re: eye diagram The reason that the beginning 1000 data points are omitted in the receiver side is that filter delay should be considered and thoses beginning points should be deleted . EYE = zeros(700,1000); EYE[:] =xt_Rx(1001:1000+700*1000); These two lines indicates that EYE is a...
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    What is the new subject in ultra wideband communication?

    Re: new subject in uwb It's a hot topic currently. Lots of areas are related to UWB, such as ST coding, pulse shaping, equalization, multiple access, LNA and mixer design.
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    Why we need Channel Estimation Sequence for OFDM system?

    Channel estimation is implemented to obtain the transfer function of the real channel, which is necessary for non-differential modulated OFDM systems, such as IEEE 802.11a. eg. d is the transmitted data before IFFT and d' is the received data after FFT. Then d' = d * H, where H is the transfer...

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