Subband Adaptive Loading for Combination of OFDM and Adaptive Antenna Array

Ming LEI  Hiroshi HARADA  Hiromitsu WAKANA  Ping ZHANG  

Publication
IEICE TRANSACTIONS on Communications   Vol.E87-B   No.9   pp.2798-2802
Publication Date: 2004/09/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
adaptive loading,  orthogonal frequency division multiplexing (OFDM),  adaptive antenna array,  

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Summary: 
In this letter, we investigate the performance of using subband adaptive loading for the combination of orthogonal frequency division multiplexing (OFDM) and adaptive antenna array. The frequency-domain adaptive loading is very effective to deal with the frequency-selective fading which is inevitable in broadband wireless communications. However, almost all of the existing adaptive loading algorithms are based on "subcarrier-to-subcarrier" mode which may results in awfully large signaling overhead, since every subcarrier needs its own signaling loop between the transmitter and receiver. We investigate the performance of the combination of OFDM and adaptive antenna array when a subband adaptive loading algorithm is used to decrease the signaling overhead. It is shown by simulation results that at the cost of some tolerable performance loss, the signaling overhead of adaptive loading can be greatly reduced.