Preamble Structure for IEEE 802.11n Wireless LAN System

Tsuguhide AOKI  Yoshimasa EGASHIRA  Daisuke TAKEDA  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.10   pp.3219-3227
Publication Date: 2009/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.3219
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Terrestrial Radio Communications
wireless LAN,  MIMO-OFDM,  AGC,  tone-interleaving,  cyclic delay diversity,  

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This paper proposes a preamble structure that raises the throughput of the physical layer of a MIMO-OFDM system that complies with IEEE 802.11n. The proposed preamble is based on two important criteria that have not been considered in conventional preamble structures but have an important bearing on realization of IEEE 802.11n. One is backward compatibility with legacy devices, such as IEEE 802.11a or IEEE 802.11g. The other is accurate AGC for MIMO data payload of the packet. Computer simulations and a laboratory test demonstrate that the proposed preamble is superior to the other preambles with respect to those two important criteria. The results were submitted to the task group N under the IEEE 802.11 working group and contributed to development of the current draft of IEEE 802.11n.