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بسم الله الرحمن الرحيم

بسم الله الرحمن الرحيم. Classification of CDMA. CDMA. Hybrid CDMA. Pure CDMA. DS/FH. DS. FH. TH. MC-CDMA. DS/TH. TDMA/CDMA. FH/TH. MT-CDMA. DS/FH/TH. Fast. Slow. Narrow band. Wide band. Frequency. Frequency. Hopping. Hopping.

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بسم الله الرحمن الرحيم

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  1. بسم الله الرحمن الرحيم

  2. Classification of CDMA CDMA Hybrid CDMA Pure CDMA DS/FH DS FH TH MC-CDMA DS/TH TDMA/CDMA FH/TH MT-CDMA DS/FH/TH Fast Slow Narrow band Wide band Frequency Frequency Hopping Hopping

  3. Orthogonal Frequency Division Multiplexing (OFDM) • OFDM is split the data stream to be transmitted into N parallel streams of reduced data rate and to transmit each of them on separate sub-carrier. These are made orthogonal by making the peak of each sub-carrier signal coincide with the nulls of other signal, this is saving the bandwidth. the spectrum of OFDM signal Concept of OFDM signal (a) FDM (b) OFDM

  4. Analysis of MC-CDMA in frequency selective rayleigh fading channel • The MC-CDMA Schemes are mainly categorized into two groups • the spreading is done in the frequency domain. • the spreading is done in the time domain.

  5. Spreading in frequency

  6. Downlink MC-CDMA Transmitter

  7. Channel Model for downlink MC-CDMA • Through the multipath fading channel, the received signal is written as:

  8. Receiver Model for downlink MC-CDMA

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