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Improvised K-Deep Relative Power Jump Processing for DFS Radar Signal Detection in 5 GHz U-NII Frequency Bands

IP.com Disclosure Number: IPCOM000032060D
Original Publication Date: 2004-Oct-21
Included in the Prior Art Database: 2004-Oct-21
Document File: 5 page(s) / 160K

Publishing Venue

Motorola

Related People

Vijay Patel: AUTHOR [+3]

Abstract

This memo describes an improved method to detect the presence of radar signals for the purposes of utilizing an unlicensed 5 GHz band on a secondary-use basis in order to comply to mandate by most spectrum regulation bodies around the world. The primary use of these unlicensed bands are reserved for the incumbent radar community.

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Improvised K-Deep Relative Power Jump Processing for DFS Radar Signal Detection in 5 GHz U-NII  Frequency Bands

Vijay Patel, Michael Hoghooghi, and Sebastien Simoens

Abstract:  

This memo describes an improved method to detect the presence of radar signals for the purposes of utilizing an unlicensed 5 GHz band on a secondary-use basis in order to comply to mandate by most  spectrum regulation bodies around the world.  The primary use of these unlicensed bands are reserved for the incumbent radar community.

Existing prior art developed so far utilizes a method by which the differential power jump between two sample measurements of received power is used to decide whether a radar signal is present. Indeed, this method results in an improved detection under certain conditions, such as, received pulse width, pulse BW,  sampling rate, received signal strength, number of pulses processed, etc.

The concepts described in this memo are simply an extension to existing method to improve the efficiency of detection (that is, in deciding whether the sample measurement indicates presence of a radar signal) of  one-deep (or one measurement) correlation to an appropriate (to a particular situation) “K-deep” one; where, K = 1, 2, 3, . . . (sample measurements and/or pulses being sampled on) depending on the parameter-set (such as, PRF, number of pulses processed, sampling rate, pulse width of incoming radar signal, pulse BW or extent of band-limitation, received signal level, etc.).

Initial simulation conducted resulted in significant improvement in radar detection over the conventional one-deep method.

The Problem:

The regulatory bodies around the world, including the European Union, US, and

Japan

, have recently started to open up various unlicensed spectrum in the 5GHz region for use by wireless devices, particularly the fast proliferating WLAN (Wireless Local Area Networks), on a secondary-use basis. The primary users of these bands being many different types of radars spanning applications such as weather monitoring, and location and tracking for civilian and defense purposes.

The regulations mandate the use of DFS (Dynamic Frequency Selection) and TPC (Transmit Power Control) to safeguard operations of primary users. The secondary WLAN users, thus, are required to detect the presence of any radar operating in the band(s) they are currently using or have intentions to operate in.

Therefore, faster and more reliable detection of radar signals in these bands will relatively improve the efficiency of WLAN operation.

Improved Radar Signal Detection:

This K-deep processing, in contrast to existing one-deep detection method,  can be done for two different situations as described below:

[A]  When all K samples are believed to be on or around the same single  pulse:

·         Take into account the overall trend-vector between the vector di...