Radio reception apparatus, symbol timing control method, and symbol timing control program

Abstract

In the radio receiving device, the digital output signal of the quadrature detector (4) is downsampled by a sampling frequency converter (15) and supplied to a band limiting filter (6). The symbol timing deviation detection circuit (18) detects the magnitude of the sampling timing deviation in the sampling frequency converter (15) based on the correlation value obtained from the output of the band limiting filter (6) by the symbol timing detection circuit (17) and direction, and adjust the sampling timing in the sampling frequency converter (15). Thus, correctly timed symbol points are extracted.

Description

technical field [0001] The present invention relates to a wireless receiving device, a symbol timing control method, and a symbol timing control program, and more specifically, to a mobile communication system for realizing high-speed and large-capacity communication such as data communication, such as a wireless system used for its base station. A receiving device, a symbol timing control method and a symbol timing control program. Background technique [0002] Conventionally, in mobile communication systems such as PHS (Personal Handyphone System), a modulation scheme such as π / 4QPSK (Quadrature Phase Shift Keying) is used. [0003] Figure 13 It is a functional block diagram showing the configuration of, for example, a wireless receiving device constituting a base station of a conventional PHS employing such a modulation method. [0004] refer to Figure 13 , the radio frequency analog reception signal received by the antenna 1 is supplied to the frequency conversion cir...

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Problems solved by technology

[0035] Therefore, when the 16QAM method is adopted as the PHS modulation method, there is the following problem: that is, if Figure 16 As shown, if the sampling timing of the symbol point is not appropriate, the corresponding symbol to one of the four symbol points configured in a grid in a certain quadrant of the IQ coordinate plane will be mistaken for other adjacent symbol points , and a reception error occurs in the signal processing of the subsequent stage

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