Adaptive modulation and other extensions of the physical...

Details Adaptive modulation and other extensions of the physical... Adaptive modulation and other extensions of the physical...

2003-03-14

2009-08-25

Phan, Tri H (Department: 2416)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S447000, C370S461000

Reexamination Certificate

active

07580383

ABSTRACT:
The present invention seeks to improve data exchange in a communications system that is especially standardized according to IEEE 802.11a. For this purpose, when the transmission medium, preferably an IEEE 802.11 system with a distributed coordination function (DCF) is accessed in a decentralized manner, pilot signals are transmitted from the transmitter to the recipients using a number of transmission modes and then an allocation table regarding the transmission modes is calculated by the recipient on the basis of the pilot symbols received. The recipient transmits the allocation table to the transmitter so that the subsequent data exchange can proceed on the basis of the allocation table. In the case of centralized access, preferably an IEEE 802.11 system with a point coordination function (PCF), data exchange is improved in that the subsequent data are adaptively modulated already when the allocation table is transmitted.

REFERENCES:
patent: 5521906 (1996-05-01), Grube et al.
patent: 6359934 (2002-03-01), Yoshida
patent: 6452917 (2002-09-01), Leung
patent: 2002/0172186 (2002-11-01), Larsson
patent: 100 46 655 (2001-06-01), None
patent: 1 187 413 (2002-03-01), None
patent: WO 02/082751 (2002-10-01), None
Kim, Dongwoo; “Forward Link Power Allocation for IS-95 Based CDMA Mobile Systems”, R&D Center, Shinsegi Telecomm Inc., IEEE 1999, 0-7803-5284, pp. 1126-1130.
Information Technology Telecommunications and Information Exchange between Systems Local and Metropolitan Area Networks Specific Requirements, Part 11, Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, Chapter 9, 1999, pp. 70-79.
Drabu Yasir: A survey of QoS Techniques in 802.11. Jan. 1999, pp. 1-11.
AT&T et al.: IEEE 802.11 QoS MAC Enhancements Joint Proposal Passage, IEEE 802.11 May 2000, pp. 1-50.
Jim Mollenauer et al.: Polling based PCF For Strom QoS Guarantees, IEEE 802.11-00/061, May 2000, pp. 1-22.
Barreto A.N., Furrer S.: Adaptive bit loading for wireless OFDM systems, Personal, Indoor and Mobile Radio Communications, 2001, 12thIEEE International Symposium, Sep./Oct. 2001, San Diego vol. 2.

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