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System and method for station detection and seek in a radio receiver

A technology of radio receivers and transceivers, applied in transmission systems, electrical components, transmission monitoring, etc., can solve problems such as incorrect locking of invalid channels, damage to the robustness of search functions, etc.

Active Publication Date: 2011-01-19
SKYWORKS SOLUTIONS INC
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  • Abstract
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Problems solved by technology

On the other hand, if the threshold is set too low, the radio will falsely lock onto invalid channels with noise energy greater than the threshold
Therefore, there is usually a compromise in choosing the RSSI threshold, which compromises the robustness of the search function

Method used

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  • System and method for station detection and seek in a radio receiver
  • System and method for station detection and seek in a radio receiver
  • System and method for station detection and seek in a radio receiver

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Embodiment Construction

[0023] Although described with particular reference to portable transceivers including FM radio receivers, systems and methods for station detection and searching in radio receivers can be implemented where it is desired to automatically detect and lock on to a specific radio station associated with a desired radio station. in any receiver for a radio frequency (RF) carrier signal.

[0024] Systems and methods for station detection and searching in radio receivers use multiple criteria to detect valid channels. A first criterion includes using the RSSI signal as an indicator of valid channel presence. The second criterion consists in using the ratio of the power in the desired channel to the power in the adjacent channel as another indicator of the presence of a valid channel. The ratio of the power in the desired channel to the power in the adjacent channel is known as the Signal Adjacent Channel Power Ratio (SACPR). When the SACPR exceeds a certain threshold, the desired c...

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Abstract

A system for detecting a broadcast channel in a radio receiver includes a receive signal strength indicator (RSSI) element configured to develop an RSSI signal that is representative of a power in a desired channel, a switchable bandwidth channel select filter having a power detector configured to compare a power output of the desired channel and at least one channel adjacent to the desired channel to develop a signal to adjacent channel power ratio (SACPR) signal that is representative of the noise in the desired channel, and a seek element configured to determine whether the RSSI signal is greater than a predetermined RSSI threshold and configured to determine whether the SACPR signal is greater than a predetermined SACPR threshold.

Description

[0001] Cross References to Related Applications [0002] This application is related to U.S. Patent Application Serial No. 11 / 681,211, filed March 2, 2007, and entitled "System And Method For Adjacent Channel Power Detection And Dynamic Bandwidth Filter Control," which is incorporated in its entirety into this document by reference . Background technique [0003] Portable communication devices, such as cellular telephones, personal digital assistants (PDAs), and other communication devices often include multiple radio receivers or transceivers. For example, a cellular telephone may include a cellular transceiver, television receiver and FM radio. One of these features included in many FM radio receivers is a function called "seek". The search function enables the radio to automatically and autonomously search for valid channels (ie channels where the station broadcasts exist). An important aspect of implementing a robust search function is the ability to reliably detect val...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/16H04B1/10
CPCH04B1/1036H04B17/0057H04B17/318
Inventor Y·时J·P.·永G·L.·罗雷特R·W.·德赫特
Owner SKYWORKS SOLUTIONS INC
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