Testing in an RF communication system
AssigneeNokia Telecommunications Oy
InventorsJari Pekkarinen, Toni Neffling
Life of this patent
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Abstract
A test method in an RF communication system. In the communication system, at least one RF communication channel lies about a known carrier frequency in an RF communication band. According to the method, a diagnostic signal is introduced into a circuit to be tested, such as a linear power amplifier, the diagnostic signal having an RF diagnostic frequency lying within the communication band. The diagnostic signal is down converted to an intermediate frequency for diagnostic purposes so that DSP is simplified. The diagnostic frequency is selected based on the known carrier frequency of the communication channel so that the communication channel is not down converted as an image band with the diagnostic signal.
Claims12
A test method in an RF communication system in which at least one RF communication channel lies about a known carrier frequency in an RF communication band, the method comprising:
- introducing into circuitry to be tested a diagnostic signal at an RF diagnostic frequency lying within the communication band;
- and
- down converting the diagnostic signal to an intermediate frequency for diagnostic purposes after processing by the circuitry to be tested and wherein the diagnostic frequency is selected based on the known carrier frequency of the at least on communication channel such that the communication channel is not at an image frequency of said diagnostic frequency in down conversion and is not down converted with the diagnostic signal.
A transmitter for an RF communication system comprising:
- transmission circuitry for processing communication channels within an RF transmission band prior to transmission;
- a controller for selecting the carrier frequency of at least one communication channel for transmission, the carrier frequency lying within an RF communication band, said controller also being operable to select a diagnostic frequency within the RF communication band for introducing a diagnostic signal at the diagnostic frequency into the transmission circuitry for test purposes;
- and means for down converting the diagnostic signal to an intermediate frequency for diagnostic purposes after processing by the transmission circuitry wherein the diagnostic frequency is selected based on the known carrier frequency of the at least one communication channel such that the communication channel is not at an image frequency of said diagnostic frequency in down conversion and is not down converted with the diagnostic signal.
Dependencies are inferred from the claim text.