### Abstract

Original language | English |
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Title of host publication | IEEE VTS 53rd Vehicular Technology Conference, Spring 2001 |

Publisher | IEEE Institute of Electrical and Electronic Engineers |

ISBN (Print) | 0-7803-6728-6 |

DOIs | |

Publication status | Published - 7 Aug 2001 |

MoE publication type | A4 Article in a conference publication |

Event | 53rd Vehicular Technology Conference, Spring 2001, VTC 2001 Spring: Connecting the mobile world - Rhodes, Greece Duration: 6 May 2001 → 9 May 2001 Conference number: 53 |

### Conference

Conference | 53rd Vehicular Technology Conference, Spring 2001, VTC 2001 Spring |
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Country | Greece |

City | Rhodes |

Period | 6/05/01 → 9/05/01 |

### Fingerprint

### Keywords

- signal design
- fading
- Intersymbol interference
- OFDM
- spread spectrum communication
- terminology
- digital communication
- aircraft
- transmitters

### Cite this

*IEEE VTS 53rd Vehicular Technology Conference, Spring 2001*IEEE Institute of Electrical and Electronic Engineers . https://doi.org/10.1109/VETECS.2001.944575

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*IEEE VTS 53rd Vehicular Technology Conference, Spring 2001.*IEEE Institute of Electrical and Electronic Engineers , 53rd Vehicular Technology Conference, Spring 2001, VTC 2001 Spring, Rhodes, Greece, 6/05/01. https://doi.org/10.1109/VETECS.2001.944575

**Signal design for multipath fading channels-Doppler and ISI barriers.** / Mämmelä, Aarne.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

TY - GEN

T1 - Signal design for multipath fading channels-Doppler and ISI barriers

AU - Mämmelä, Aarne

PY - 2001/8/7

Y1 - 2001/8/7

N2 - Signal design for digital communications in linear multipath fading channels is discussed. We define two extremes for the symbol rate in single-carrier systems, i.e., the Doppler barrier and the intersymbol interference (ISI) barrier and we note that it is difficult to go beyond these two barriers. The Doppler barrier is roughly equal to the Doppler spread of the channel. The ISI barrier is roughly equal to the inverse of the multipath spread of the channel. We use the time-frequency duality and show, that above the ISI barrier it is advantageous to use frequency multiplexed signals like orthogonal frequency division multiplexing (OFDM) signals, and below the Doppler barrier it is advantageous to use the corresponding time-multiplexed signals. An important parameter defining the measurability of the channel is the spread factor or the product of the Doppler spread and the multipath spread. Communications in overspread channels in which the spread factor is larger than unity is also discussed. All the results should be useful for system designers.

AB - Signal design for digital communications in linear multipath fading channels is discussed. We define two extremes for the symbol rate in single-carrier systems, i.e., the Doppler barrier and the intersymbol interference (ISI) barrier and we note that it is difficult to go beyond these two barriers. The Doppler barrier is roughly equal to the Doppler spread of the channel. The ISI barrier is roughly equal to the inverse of the multipath spread of the channel. We use the time-frequency duality and show, that above the ISI barrier it is advantageous to use frequency multiplexed signals like orthogonal frequency division multiplexing (OFDM) signals, and below the Doppler barrier it is advantageous to use the corresponding time-multiplexed signals. An important parameter defining the measurability of the channel is the spread factor or the product of the Doppler spread and the multipath spread. Communications in overspread channels in which the spread factor is larger than unity is also discussed. All the results should be useful for system designers.

KW - signal design

KW - fading

KW - Intersymbol interference

KW - OFDM

KW - spread spectrum communication

KW - terminology

KW - digital communication

KW - aircraft

KW - transmitters

U2 - 10.1109/VETECS.2001.944575

DO - 10.1109/VETECS.2001.944575

M3 - Conference article in proceedings

SN - 0-7803-6728-6

BT - IEEE VTS 53rd Vehicular Technology Conference, Spring 2001

PB - IEEE Institute of Electrical and Electronic Engineers

ER -