System for flexible cyclic prefix length for preamble...

Details System for flexible cyclic prefix length for preamble... System for flexible cyclic prefix length for preamble...

2007-05-29

2010-12-28

Moe, Aung S (Department: 2474)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S344000, C375S262000, C375S341000, C455S525000

Reexamination Certificate

active

07859988

ABSTRACT:
A system providing flexible cyclic prefix length in a preamble (i.e., superframe preamble) is disclosed. The preamble comprises a first section and a second section. The first section contains at least one broadcast channel and occupies the first number of OFDM symbols in the preamble. The second section contains acquisition pilots and occupies the remaining number of OFDM symbols in the preamble. A first cyclic prefix length is used in the first section. It is indicated by the first broadcast channel and is unknown to a mobile station before the mobile station decodes the first broadcast channel. The second cyclic prefix length is used in the second section. It is fixed and known to the mobile stations. The first broadcast channel is located at the last OFDM symbol in the first section and is next to the second section in time.

REFERENCES:
patent: 2004/0218522 (2004-11-01), Sundstrom et al.
patent: 2006/0013325 (2006-01-01), Agrawal et al.
patent: 2006/0250940 (2006-11-01), Tirkkonen et al.
patent: 2007/0093253 (2007-04-01), Lindoff et al.
patent: 2007/0211661 (2007-09-01), Tee et al.
“Joint Proposal for 3GPP2 Physical Layer for FDD Spectra,” 3rd Generation Partnership Project 2, Jul. 31, 2006, pp. 1-83, China Unicom, et al.

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