Performance Analysis of a Forward Link Channel Estimation Method for Wireless Multicarrier Systems
Xiaofei Dong
Zhi Ding
Dasgupta, S.
Altera Corp., San Jose, CA;
This paper appears in: Wireless Communications, IEEE Transactions on
Publication Date: August 2008
Volume: 7,
Issue: 8
On page(s): 3026-3035
ISSN: 1536-1276
INSPEC Accession Number: 10177487
Digital Object Identifier: 10.1109/TWC.2008.060939
Current Version Published: 2008-08-19
Abstract
We present an effective method for time domain channel estimation of wireless orthogonal frequency division multiplexing (OFDM) system. Relying on a bent-pipe mechanism, the mobile receiver sends a fraction of the received data back to the base station which can then estimate both the forward link and reserve link channel impulse responses. Given knowledge on the forward link channel response, the resource rich base station can employ effective adaptive modulation schemes to increase OFDM system capacity. In this paper, closed-form expressions for channel estimation Cramer Rao lower bound are derived for the feedback system. Impact of feedback parameters on channel estimation performance is discussed through Cramer Rao bound analysis and simulation. Identifiability issues associated with power loaded multicarrier systems are also addressed. Simulation results on the proposed feedback channel estimation scheme are shown.
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