System and method for steering directional antenna for wireless communications

a wireless communication and directional antenna technology, applied in the field of wireless data communication, can solve the problems of non-optimal use of per or rssi to determine the optimal antenna position over such a wide range of bandwidth, and the operating range of a wireless system typically decreases with increasing data rate, so as to improve the optimization of the antenna position and reduce the overhead of data

Active Publication Date: 2006-10-19
TEXAS INSTR INC
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AI Technical Summary

Benefits of technology

[0009] The present application describes a system and method for determining the optimal antenna position (pointing angle and / or azimuth and / or elevation angle) of a directional antenna in a wireless communication system by computing a steering metric (SM) at each of a multiplicity of antenna positions. This steering metric is a function of receiver gain G (indirectly measuring RSSI), packet error rate (PER), and empirically-derived constants. The antenna position having the highest steering metric value is then selected as the optimal one to use. The method provides improved optimization of antenna position even with widely-varying data rates. Further, reduced data overhead (training bits) is required to determine the optimal antenna position.

Problems solved by technology

Operating range in a wireless system typically decreases with increasing data rate, for a given transmit power (which is often limited by law).
Use of only PER or RSSI to determine optimum antenna position over such a wide range of bandwidth is non-optimal.

Method used

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  • System and method for steering directional antenna for wireless communications

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Embodiment Construction

[0014] The description that follows presents a series of systems, apparati, methods and techniques that facilitate additional local register storage through the use of a virtual register set in a processor. While much of the description herein assumes a single processor, process or thread context, some realizations in accordance with the present invention provide expanded internal register capability customizable for each processor of a multiprocessor, each process and / or each thread of execution. Accordingly, in view of the above, and without limitation, certain exemplary exploitations are now described.

[0015]FIG. 1 is a graph of the known general relationship between data rate and range in a typical 802.11 WLAN system. The vertical axis 102 represents data rate in Mbps; the horizontal axis 104 represents a dimensionless measure of relative distance. Actual distance achieved is dependent on many factors other than data rate, such as transmit power, obstructions in the path, interf...

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Abstract

A system and method for determining an optimal antenna position of a directional antenna in a wireless communication system are described. The optimal antenna position is determined by calculating a steering metric value for possible antenna positions and the antenna position with the highest steering metric value is selected as the optimal antenna position.

Description

BACKGROUND [0001] 1. Field of the Invention [0002] The present disclosure relates to wireless data communication in general, and, in particular, to wireless data communication systems using switched-beam or other directional antenna technology, and the computation of a steering metric (SM) to enable optimization of antenna position (antenna pointing direction). [0003] 2. Description of the Related Art [0004] Wireless data communications systems enable data transmission among two or more network elements. An example is a wireless local-area network (WLAN) system, widely used for connecting network elements in homes and offices, based on IEEE standard 802.11x (data rates from 6 to 54 Mbps). Operating range in a wireless system typically decreases with increasing data rate, for a given transmit power (which is often limited by law). Typical wireless network elements such as a WLAN access point (AP) use omni-directional antennas for receiving and transmitting data because network elemen...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B1/06H04J99/00
CPCH01Q3/2605
Inventor WILHOYTE, MICHAEL E.GOETTEMOELLER, MICHAEL V.
Owner TEXAS INSTR INC
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