Performance study on frequency-domain link adaptation in IEEE 802.11a wireless LAN

The link adaptation scheme in the current IEEE 802.11a technical specifications only consider channel variation in the time-domain, and assume all the data subcarriers use the same modulation mode and coding rate once the transmission data rate is determined. However, in the frequency-selective fadi...

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Veröffentlicht in:PIMRC 2004 : 2004 IEEE 15th International Symposium on Personal, Indoor, and Mobile Radio Communications : proceedings : Barcelona, Spain, 5-8 September, 2004, Hotel Princesa Sofía Jg. 1; S. 83 - 87 Vol.1
Hauptverfasser: Ming Lei, Harada, H., Wakana, H., Ping Zhang
Format: Tagungsbericht
Sprache:Englisch
Veröffentlicht: Piscataway NJ IEEE 01.01.2004
Schlagworte:
Applied sciences
Bit error rate
Business and industry local networks
Coding, codes
Degradation
Exact sciences and technology
Fading
Information, signal and communications theory
Modulation coding
Multiplexing
Networks and services in france and abroad
OFDM modulation
Performance gain
Physical layer
Signal and communications theory
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Teleprocessing networks. Isdn
Time domain analysis
Transmission and modulation (techniques and equipments)
Wireless communication
Wireless LAN
Performance evaluation
Wireless LAN
Bit error rate
Low speed
Two channel system
Wireless telecommunication
Information rate
Data transmission
Frequency domain method
Specification
Subcarrier
Algorithm
Mismatching
Information transmission
Time variation
Selective fading
Frequency selection
Simulation
Orthogonal frequency division multiplexing
Transmission rate
Modulation coding
ISBN:9780780385238, 0780385233
Online-Zugang:Volltext
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Zusammenfassung:The link adaptation scheme in the current IEEE 802.11a technical specifications only consider channel variation in the time-domain, and assume all the data subcarriers use the same modulation mode and coding rate once the transmission data rate is determined. However, in the frequency-selective fading scenario, the BER performance is severely degraded by OFDM subcarriers where deep fading occurs. We propose a frequency-domain link adaptation scheme for IEEE 802.11a, which is based on a modified adaptive bit and power loading algorithm and a modified pilot pattern. Simulation results show our proposal can greatly improve performance when perfect channel information is obtainable. We also investigate the performance of the proposed scheme in two channel mismatch situations, and show it is capable of achieving large performance gain in the most favorable environment for IEEE 802.11a, the low mobile speed environment.
ISBN:9780780385238
0780385233
DOI:10.1109/PIMRC.2004.1370841