Modeling a multicarrier wireless communication transceiver
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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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Modeling a multicarrier wireless communication transceiver

Modeling a Multicarrier Wireless Communication Transceiver

Embedded Software Systems

Literature Survey

March 24,2004

By Hunaid Lotia


Overview

Overview

  • Multicarrier Modulation

  • Motivation

  • Existing Research

  • OFDM (Orthogonal Frequency Division Multiplexing)

  • Goals

  • Questions


Multicarrier modulation

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


Motivation for multicarrier modulation

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.


Existing work and research

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.


Modeling a multicarrier wireless communication transceiver

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


Project goals

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


Questions

QUESTIONS?


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