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Adaptive Pilot Signaling in the Uplink of OFDM-Based Wireless Systems
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Cited 2 time in Scopus
- Authors
- Issue Date
- 2007-07
- Citation
- 16th IST Mobile and Wireless Communications Summit, 2007
- Keywords
- Adaptive Pilot Signaling ; Uplink ; OFDM
- Abstract
- Orthogonal frequency division multiplexing (OFDM)
has been considered as one of key transmission technologies for
high-speed wireless communication systems. For channel-adaptive
transmission of OFDM signal, base stations transmit a common
pilot signal in the downlink, but mobile stations transmit
individual pilot signal in the uplink. As a consequence, the uplink
may suffer from poorer channel estimation accuracy than the
downlink. This problem can be alleviated by increasing the pilot
signal density. But this reduces the time and frequency resources
for the data transmission, deteriorating the actual transmission
throughput. In this paper, we propose an adaptive pilot signaling
scheme that adjusts the pilot density in response to the change of
channel characteristics. Simulation results show that the proposed
scheme can remarkably reduce the pilot overhead without
performance degradation, compared to conventional schemes.
- Language
- English
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