He L Liu

US Patent:

20110299612, Dec 8, 2011

Filed:

Jun 2, 2010

Appl. No.:

12/792677

Inventors:

Kun Tan - Beijing, CN
Jiansong Zhang - Beijing, CN
Yongguang Zhang - Beijing, CN
He Liu - La Jolla CA, US
Ji Fang - Beijing, CN

Assignee:

Microsoft Corporation - Redmond WA

International Classification:

H04L 27/28

US Classification:

375260

Abstract:

An uncontrolled spatial multiple access system and method facilitating spatial multiple access for multiple devices in a wireless local-area network (WLAN). Embodiments of the system and method increase throughput of the wireless network by facilitating concurrent encoded frame transmission. Decoding of the quasi-overlapped frames is achieved using a chain decoding technique that takes data streams (or signals) containing the quasi-overlapping encoded frames and isolates each encoded frame so that the frame can be decoded. Quasi-overlapped frames means that the frames are overlapped in the body of the frame but not at the preamble (or headers) of the frames. Embodiments of the chain decoding also use interference nullifying and interference cancelation to enable concurrent quasi-overlapping transmission. A carrier counting multiple access technique of embodiments of the system and method allow wireless networks to retain their asynchronous nature while supporting spatial multiple access and maintain backwards compatibility with the IEEE 802.11 standard.