RU2614345C1 - Method of exapanding dynamic range in radio systems - Google Patents

Abstract

FIELD: physics, electronics.

SUBSTANCE: invention relates to electronic engineering and audio equipment, designed for expanding a dynamic range and can be used in audio equipment and radio systems for different purposes. Expansion of the dynamic range of equipment is achieved by including N blocks of operational amplifiers, having different gain coefficients, as well as a set of K_1.N switches, which connect their own amplifier. When transmitting/recording a signal in random-access memory, they are connected so as to reduce the dynamic range of the recorded (or transmitted) signal. When processing (or receiving) a signal, a dynamic range expander also has N blocks of operational amplifiers, which are connected by K_2.N switches, and restore the initial signal by connecting the corresponding blocks of amplifiers. Therefore when recording a signal, its dynamic range is reduced, and restored again when reproducing the signal, while preserving the initial dynamic range of the processed signal.

EFFECT: expansion of dynamic range of radio systems.

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Description

The invention relates to electronic computers and radio engineering, is intended to expand the dynamic range in radio systems (RTS) and can be used in radio systems for various purposes and audio equipment.

Known methods of expanding the dynamic range [1, 2].

The AGC device contains an amplifier with adjustable gain, having an input for receiving an input signal, a control input for receiving a gain control signal, and an output for outputting an output signal. The AGC device also contains a measuring circuit for generating a received power signal based on the power of the output signal. The saturation integrator compares the received power signal with the reference signal and generates a gain control signal in response to the comparison result. The saturation integrator comprises a decision circuit for allowing integration based on the values of the received power signal, the reference signal, and the gain control signal. In a preferred embodiment, the use of an input limiter in combination with an analog-to-digital converter provides an extension of the dynamic range of the input signal [1].

There is also a method of expanding the dynamic range in a digital radio transmission system, in which, in a receiver including a signal limiter to which an analog-to-digital converter (ADC) is connected, a quadrature divider that is connected to the ADC, and a decoder that is connected to the quadrature divider, are selected the upper limit value for the dynamic range of the ADC, determine the minimum acceptable signal quality for processing the radio signal in the receiver, generate the signal quality value at the ADC output, compare the non-aligned value of the signal quality with the minimum acceptable signal quality and limit the signal to the ADC so that the signal power exceeds the value of the upper limit of the ADC, and so that the minimum acceptable signal quality is exceeded when the power of the signal transmitted from the signal limiter exceeds the value of the upper limit (prototype) [2].

However, the known methods do not allow to restore the original signal with a given accuracy.

A positive technical result - the expansion of the dynamic range of radio systems - is achieved by the fact that in the method of expanding the dynamic range in radio systems, the new thing is that N blocks of operational amplifiers are introduced having different amplification factors and connected in parallel, as well as a set of K _1.N keys that connect the corresponding operational amplifier; the dynamic range extender also has a second group consisting of N blocks of operational amplifiers that are connected in parallel using K _2.N keys; when transmitting a signal, the first group of operational amplifiers works, and when receiving / processing a signal, the second group of operational amplifiers.

A method of expanding the dynamic range is as follows. In FIG. 1 is a structural diagram of a dynamic range device in a RTS.

The input signal of operational amplifiers connected in parallel receives an input signal u _in (t). (Only amplifiers with keys K _{1.N are connected} .) Then the amplitude of the signal at the output of the operational amplifiers is described by the following formula:

Therefore, it is possible to reduce the dynamic range of the transmitted signal, which will lead to a decrease in signal distortion during transmission over the communication line.

When processing the received signal, another group of operational amplifiers is connected (see Fig. 1), and the corresponding keys K _2.N must be closed. In this case, the dynamic range of the received / processed signal can be restored with a given accuracy.

Thus, the received signal has a narrower dynamic range, so it is less prone to distortion during transmission over communication channels.

Closing the corresponding keys To _2.N , the corresponding operational amplifiers are connected (see Fig. 1) and you can restore the original signal, which will have a wider dynamic range compared to the received one.

Literature

1. Patent No. 2157044 of the Russian Federation. IPC H03G 3/20. Device for expanding the dynamic range / Decl. 09/23/1993. Publ. 04/20/1996. Bull. No. 11. - 4 p.

2. Patent No. 2163416 of the Russian Federation. IPC H03G 3/20. Method and device for automatic gain control in a digital radio / Paul I. Petersell (US), Nathaniel B. Wilson (US), Peter J. Black (AU). Claim 03/20/1999. Publ. 02/20/2001. Bull. No. 13 (prototype).

Claims (1)

A method of expanding the dynamic range in radio engineering systems, characterized in that N blocks of operational amplifiers are introduced having different amplification factors and connected in parallel, as well as a set of K _1.N keys that connect the corresponding operational amplifier; the dynamic range extender also has a second group consisting of N blocks of operational amplifiers that are connected in parallel using K _2.N keys; when transmitting a signal, the first group of operational amplifiers works, and when receiving / processing a signal, the second group of operational amplifiers.

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