RU2001528C1 - Transceiver system of broadband signals - Google Patents

Abstract

Usage: transmission of discrete information in radio channels for transmitting information in connection with moving objects. SUMMARY OF THE INVENTION: the transmitting side comprises a carrier and double clock frequency (GTCH) generator, a reference pseudo-random sequence generator (FOPP) 2, a first multiplier 3, a pseudo-random sequence generator (PCH) 4, a second multiplier 5, adder 6, a phase shifter of 90 degrees 7, phase manipulator 8, inverter 9, first and second dividers 10 and 11, initial installation unit 12 The receiving side comprises a pseudorandom sequence reference generator (GOPP) 13, a clock frequency generator (GTCH) 13, a synchronization device 15, the first and second multipliers 16 and 17, the first and second band-pass filters 18 and 19, the phase detector 20, the inverter 21, FOPP 22, the initial installation unit 23, the first and second dividers 24 and 25 The proposed transceiver system improves the noise immunity to narrowband interference 1 il

Description

The invention relates to the field of transmission of discrete information and can be used in broadband communication systems.

The purpose of the invention is to increase the noise immunity to narrowband interference.

The drawing shows a block diagram of a transceiver system for broadband signals.

The transmitting side comprises a carrier 1 and double clock frequency (GNTC) generator 1, a reference pseudorandom sequence generator (FOPP) 2, a first multiplier 3, a GPP pseudorandom sequence generator A, a second multiplier 5. adder 6. 90 ° phase shifter, phase shifter 90 ° 7, phase shifter 8. inverter 9. first and second dividers 10 and 11, block 12 of the initial installation.

The receiving side contains a pseudo-random reference generator 13, a sequence (GOPP), a clock generator (GTI) 14, a synchronization device 15, the first and second multipliers 16 and 17, the first and second band-pass filters 18 and 19. phase detector 20. inverter 21, FOPP 22, initial installation unit 23, first and second dividers 24 and 25.

A transceiver system for wideband signals operates as follows.

A carrier frequency and a double clock frequency are generated in GNTC 1, which is supplied to the FOPP 2 through a divider 11 into two, to the GOPP 4 through a series-connected inverter 9 and a divider 10 into two. Through the use of dividers 10 and 11 and inverter 9, a half-cycle time shift between the clock frequencies supplied to the FOPP 2 and GOPP 4 is performed. In FOPP 2 and GOPP 4, a synchronization sequence (SP) and information sequence (IP), IP manipulation are formed - phase information is ± 90 ° in the phase manipulator 8 by information messages, the IP and SP are phase-shifted ± 90 ° in the carrier formed in the GNST in multipliers (phase manipulators) 3 and 5. In this case, using phase shifters by 90 ° 7 a phase shift between the carriers is achieved, under accrued by multipliers 3 and 5.

Block 12 generates a start pulse FOPP 2, GOPP 4 and dividers 11 and 10.

A double clock frequency is generated in the receiving part in the GTP 14, which is supplied through the divider 24 to the FOPP 22, where the reference SP is formed, and through the inverter 21, the divider 25 to the GOPP 13, where it is used to form the reference SP. Input

The NPS is supplied to the multipliers 16 and 17, where it is multiplied with the reference SRPs formed by the FOPP 22 and the GOPP 13. The synchronization device 15 ensures the synchronism of the reference SRP with the received signals. The result of the multiplication is filtered in bandpass filters 19 and 18 and fed to a phase detector 20, from the output of which an information signal is fed to the output of the system.

Block 23, upon supplying power to it, generates a start pulse to dividers 24 and 25.

In the presence of non-linearity in the propagation path of the BBA, the non-linearity of the repeater, the noise immunity of receiving the BBA under the influence of harmonic interference is sharply reduced.

Let the input of a nonlinear element

useful ShPS

Xc (t) - ACCOS (GJfct + pc (t) + / b0) and interfering harmonic oscillation

Xn (t) - Ancos (Wht + Yno).

thirty

The characteristic of a nonlinear element has the form

(t) - a0 + aix (t) + hell x2 (t).

eat

At the output of a nonlinear element, we have Y x (t) ao + aixc (t) + aixn (t) + 82xc2 (t) + a2Xn (t) + 2a2xc (t) xn (t) - a0 + aiAcCos (fflfct + + Yc ( t) + Yc0) + aiAncos (Uh t + Yno) +

+ 32A22COS (CUfct + Yc (t) + Yco) +

+ a2An2cos (ftJh t + Yno) + 2a2AcAncos (uJtt + + Yc (t) + Yco) x cos (o) ht + Yn0).

The harmonic noise at the tan-2ofc frequency is a danger, since it gives the combination component of the noise and signal at the signal frequency.

Only components having frequencies coinciding with the signal frequency and falling into the element passband pass to the output of the nonlinear element. Therefore, we have a signal at the output

U (t) - aiAccos (Gtet + Yc (t) + Yco) +

+ a2AcAnCOS ((Del - Yc (t) - Yco + Yn0).

In the last expression, a useful signal component

aiAccos (uJb t + Yc (t) + Yc0)

Interference component that creates the risk of interference during further processing

a2AcAncos (uJfct - Yc (t) - YCO + Yno).

At any value of the clock frequency, a phase shift is provided between the PI and SP by T0 / 2, where G0 is the duration of the SRP element. Due to this, additional manipulation of the total signal vector at the output of adder 6 by ± / 4 appears. Thus, for the phase of the signal, Yc (t) ± l / 2 ± l / 4 can be written. and for the noise component, we have Yn (t) - Yc (t)

- ± l / 2 ±.

Thus, a phase shift of 90 ° is provided, thereby eliminating the influence of the noise component on the signal component.

(56) Copyright certificate of the USSR No. 300946, cl. H 03 C 3/40, 1986.

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Claims (1)

The claims A TRANSMISSION SYSTEM FOR WIDE-BAND SIGNALS, comprising on the transmitting side serially connected a carrier and a double clock frequency (HST), a 90 phase shifter, a first multiplier and an adder, an orthogonal pseudorandom sequence generator (FOPP) and a pseudo random sequence generator (GPP), a phase manipulator and a second multiplier, the output of which is connected to the second input of the adder, the second output of the second multiplier is connected to the input of the phase shifter by 90, the output of which is connected to the first input of the first multiplier, the second input of which is connected to the output of the FOPP, while the output the adder is the output of the transmitting side, and the information input of the phase manipulator is the information input of the transmitting side, on the receiving side there are serially connected synchronization device, FOPP, the first multiplier, a first bandpass filter and a phase detector connected in series to a reference sequence generator (GOPP), a second multiplier and a second bandpass filter, the output of which is connected to the second input of the phase detector, the second inputs of the first and second multipliers and the input of the synchronization device are interconnected and are the input 15 of the receiving side, the output of the synchronization device is also connected to the first input of the GOPP, characterized in that the inverter and the first 20 a divider, the output of which is connected to the second input of the GPP, and a series-connected initial installation unit and a second divider, the second input and output of which is connected to the second GNSS output, the inverter input and the first input of the FOPP, the second input of which is connected to the output of the initial installation block, the second the input of the first divider and the second input of the GLP, the input of the initial installation unit is the input of the initial installation of the transmitting side, on the receiving side is the series-connected initial installation unit and the first divider, last well-connected clock pulse generator (GTI), an inverter and a second divider, the output and the second input of which are connected to the second input of the GOPP and the output of the initial installation block, the output of the first divider is connected to the second input of the OPF, the input of the initial installation block is the input of the receiver side. 25 thirty 35