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Recent content by honhungoc

  1. H

    What is the difference between OFDMA and multiuser OFDM?

    difference between ofdm and ofdma Hi all I'm confuse abt the difference between OFDMA and multiuser OFDM Are both same? Anyone pls clarify it for me Thank u
  2. H

    Question related to SNR - the total transmit power

    Question related to SNR Hi all In multiuser OFDM, suppose the average SNR per subcarrier is 15dB. The variance of additive white Gaussian noise at each receiver is assumed equal and unified (means =1). The average channel gain is from 0.1 to 1. From this, can I compute the total transmit...
  3. H

    Need help in Rayleigh fading channel

    Hi I'm simulating according to the existing paper. However, I dont understand some parameters and dont know how to generate them. Could anyone please help me? "The variance fo additive white gaussian noise at each receiver is assumed equal and unified. The fading channel is three-path Rayleigh...
  4. H

    What is the relationship of Eb/No with BER?

    Anyone please tell me what is the relationship of Eb/No with BER for QPSK modulation? Thank u
  5. H

    need help regarding error control coding

    Thank u if u can upload some references
  6. H

    what is the relationship between dB/dec and dB/oct?

    db/dec Hi all Anyone please tell me what is the relationship between dB/dec and dB/oct? Thank you very much
  7. H

    Ask abt parity check matrix of linear code

    When i solve problems, i face this expression but i dont know what it imply Anyone please help me a (6,3) linear code is constructed as follows bit 2 is a parity check on bits 5 and 4 bit 1 is a parity check on bits 4 and 3 bit 0 is a parity check on bits 5 and 3 Thank u very much
  8. H

    need help regarding error control coding

    Hi all I need some reference regarding error control coding, espcially solutions Thank you very much
  9. H

    MATLAB PROGRAMING + gaussian finction

    +oversampling +cdr +simulink Hi, I'm really interested in this class I'm master student, however i'm not good at matlab
  10. H

    multimode optical fiber can be made single mode?

    anyone please help me in this question in which condition, multimode optical fiber can be made single mode? Thank you very much
  11. H

    why bit errors accumulate?

    As i know, in PCM transmission, noise does not accumulate due to regenerative process carried out at repeaters, however bit errors do accumulate. Anyone please explain me why bit errors accumulate Thank u
  12. H

    What is the rule for HDB3 encoding?

    Hi Can anyone give me clear rule of HDB3? I read some materials with little bit different rules that make me confused And i hv the bit stream 10000000000100, how to encode this correctly Thanks
  13. H

    one clarification need in Alamouti Scheme

    in my project, i also simulator alamouti sheme the result is system 2x2 is better than 2x1 Take a look in file attach
  14. H

    Need help in space time coding

    Hi everyone I'm doing project abt space time coding and want to hv a deep awareness on it I hope everyone can help me - Is Space time trellis codes (STTCs) Trellis-coded modulation (TCM) schemes for MIMO channels? - In STTC, redundancy is introduced by using a constellation with more points...
  15. H

    matlab help for implementing Alamouti scheme.

    Youn can find it here www.mathworks.com
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