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Method for signal energy detection in a frequency-selective channel of a communication system with multiple antennas

IP.com Disclosure Number: IPCOM000130138D
Publication Date: 2005-Oct-12
Document File: 6 page(s) / 37K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for signal energy detection in a frequency-selective channel of a communication system with multiple antennas. Benefits include improved functionality and improved performance.

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Method for signal energy detection in a frequency-selective channel of a communication system with multiple antennas

Disclosed is a method for signal energy detection in a frequency-selective channel of a communication system with multiple antennas. Benefits include improved functionality and improved performance.

Background

              Wireless local area networks (LAN) and metropolitan area networks (MAN) are standardized by specifications from the

Institute

of

Electrical

and Electronics Engineers, Inc. (IEEER), including the following:

•             802.11TM, 1999 Edition (ISO/IEC 8802-11: 1999) IEEE Standards for Information Technology -- Telecommunications and Information Exchange between Systems -- Local and Metropolitan Area Network -- Specific Requirements -- Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications
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•             802-11:1999/Amd 1:2000(E)), IEEE Standard for 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—Amendment 1: High-speed Physical Layer in the 5 GHz band

•             802.16 Conformance 01-2003 “IEEE Standard for Conformance to IEEE 802.16 Part 1: Protocol Implementation Conformance Statement (PICS) Proforma for 10-66 GHz WirelessMAN-SC Air Interface”

•             802.16 Conformance 02-2003 “IEEE Standard Conformance to IEEE Std 802.16 Part 2: Test Suite Structure and Test Purposes for 10-66 GHz WirelessMAN-SC Air Interface”
•             802.16 Conformance 0-200 “IEEE Standard Conformance to IEEE Std 802.16 Part 3: Radio Conformance Tests (RCT) for 10–66 GHz WirelessMAN-SC™ Air Interface”

•             802.16.2-2004 “IEEE Recommended Practice for Local and Metropolitan Area Networks -- Coexistence of Fixed Broadband Wireless Access Systems”

•             802.16.2-2004 “IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Fixed Broadband Wireless Access Systems”

      Conventional wireless transceivers include a mechanism for measuring the received signal energy in the specified frequency band. The transceiver measures radio frequency (RF) energy at the antenna and determines the strength of the received signal. This measured value is commonly known as the received signal strength indication (RSSI). It is used for clear channel assessment (CCA) algorithms and for packet detection.

      For packet detection, the RSSI criterion is typically outperformed by autocorrelation and matched-filtering algorithms. However, RSSI is very important for CCA algorithms used in the dynamic frequency selection (DFS) scheme of the 802.11 standard and the initial network entry for 802.16 standard. The performance of the CCA algorithms are expected to become increasingly important with the adoption of cognitive radio in which comm...