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Modeling a Multicarrier Wireless Communication Transceiver

Modeling a Multicarrier Wireless Communication Transceiver. Embedded Software Systems Literature Survey March 24,2004. By Hunaid Lotia. Overview. Multicarrier Modulation Motivation Existing Research OFDM (Orthogonal Frequency Division Multiplexing) Goals Questions.

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Modeling a Multicarrier Wireless Communication Transceiver

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  1. Modeling a Multicarrier Wireless Communication Transceiver Embedded Software Systems Literature Survey March 24,2004 By Hunaid Lotia

  2. Overview • Multicarrier Modulation • Motivation • Existing Research • OFDM (Orthogonal Frequency Division Multiplexing) • Goals • Questions

  3. Multicarrier Modulation • Technique in which multiple frequencies are used to transmit data • Divide broadband channel into narrowband sub channels • Widely used in ADSL and wireless LAN

  4. Motivation for Multicarrier Modulation • Applications requiring high rate data transmission. • Increasing power of Digital Signal Processing tools. (1960’s) • Applications range from Digital Audio and Video Broadcasting to High-Speed Wireless LANs.

  5. Existing Work and Research • Most common candidates for Multicarrier Wireless (Mobile) Communication are: • Direct Sequence Code Division Multiple Access (DS-CDMA)- Receiver Complexity • Frequency Hopping-CDMA (FH-CDMA)- Requires powerful channel coding to mitigate fading effects. • Solution: OFDM Transmission System • Considered for fourth-generation mobile communication systems.

  6. An OFDM Modem N subchannels N complex samples S/P quadrature amplitude modulation (QAM) encoder N-length Inverse FFT add cyclic prefix P/S D/A + transmit filter Bits TRANSMITTER multipath channel RECEIVER N subchannels N complex samples Receive filter + A/D P/S QAM decoder N-length FFT S/P remove cyclic prefix invert channel = frequency domain equalizer

  7. Project Goals • Model the OFDM system in Synchronous Dataflow (SDF) • All nodes produce and consume fixed number of tokens • Use SDF domain in Ptolemy to verify the model • Investigate other open issues that come up as the projects builds up

  8. QUESTIONS?

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