SU1053302A1 - Multichannel radio communication method - Google Patents

Abstract

A MULTI-CHANNEL RADIO COMMUNICATION METHOD using Walsh signals, which means that on the transmitting side in each canape the Walsh signals of the modular unit using frequency modulation are summed and transmitted, and on the receiving side they receive and demodulate the received signal, and the synchronization signal is transmitted separately a radio channel, characterized in that, in order to increase the noise immunity of the radio, after modulating the Walsh signals using SIGNSHY frequency modulation, each channel is delayed by mn nt, where p is the number of a kanash, at this time is the time, where the TAS is the duration of the Walsh symbol, fjn is the duration of the guard interval between signals of different channels, and the received signals are received (L is delayed by f -1 f np - Cf n OJaKTs,

Description

This invention relates to radio using orthogonal signals.

There is a method of multi-channel communication in which the information signals of various channels filter, amplitude-modulate the signals of the W.and, summarize, -demodulate and filter 13.

However, in this method low noise immunity.

The closest technical peiaeHKeM of the invention is a multichannel radio method using Walsh signals, which means that on the transmit side of each channel, Walsh signals are modulated using frequency modulation, they are summed and the forward curves, and on the receiving side they receive and demodulate the received signal , while the synchronization signal is transmitted over a separate radio channel t2 J.

However, the known method does not have the required noise immunity for a given amount of current power in the radiating antenna

The purpose of the invention is to increase the resistance of radio resistance.

The goal is achieved by the method of multichannel radio communication using Walsh signals, the conclusion is that on the transmission side of each channel, Walsh signals are modulated using frequency modulation, added up and transmitted, and received on the receiving side, the received signal is demodulated , while the synchronization signal is transmitted via a separate radio channel, after modulation of the Walsh signals using Frequency modulation, the signals in the CDS channel are delayed by.

n - channel number, while

Where.

R

f T.

CV ing

fe is the time, is the duration of the la Walsh symbol;

ei protective duration

the interval between the signals is different; channels,

while receiving, the received signals are delayed by the time t -c.

GR su in (J

Figures 1-17 illustrate the proposed method.

The essence of the method lies in

0 that discrete, 4 ", 1FIG signals. 1-4) modulate, using frequency modulation, the Walsh carrier signals of a trapezoidal shape (Fig. 5-8). Next, the modulated carriers of each channel are closed at the time Taod - where J is the channel number, and the value, where l is the duration of the Walsh signal front (FIG. 9-13). The signals of the individual channels sum up, the total signal (Fig. 14) emit .

M (; radiance of the emitted signal, which characterizes the energy consumption of the signal transmission method, is proportional to the oval of the square of the derivative of the total signal. The intensity of the electric field in the receiving zone is characterized by the process (Fig. 15). The received signal is proportional to the intensity of , further delayed by the value of t | d "T - T-evdg where T is the duration of the Walsh signal symbol {Fig.16 and 17K

After that, the signal is demodulated. Sync signal

 is transmitted on a separate channel.

The introduction of delays in separate channels leads to the fact that in the total signal the total average

0, the number of pulses of the derivative of the total signal is reduced due to negative values of the correlation coefficients of the signals used, which reduces the average current saturation in the antenna as compared with the known method. With a given energy channel, the predlagaclacai mode is the same. The receiver will provide better signal-to-noise ratio at the receiver input, i.e. greater noise immunity.

Shs (1 (Tz, GZ}

1-P-g-gi 1 p P-Gb

, t (Jal {Ts, 2)

t

Fi.2

U / at (T3.9)

, Si2 (t)

.s "r;

2M

/

I I I-I-4-I - I-I-I. i:., I-V-- - "- S a-T Mrf ..lt

Ft

ut.S

.6

8.7

Fb (10

Fig.i

FIG. 12

fU9.t3 b, (t) bi {t-r KAn,, n, m,,,

e77

Fi. /

I u..1nur .. ln, ..n,

Claims (1)

METHOD FOR MULTI-CHANNEL COMMUNICATION using Walsh signals, comprising the steps that at the transmitting side in each channel signals Walsh modulated with frequency modulation, sous »®« - ωαΙ (Τ _8, ξ) ruyut them and transmitting and receiving at the receiving side, the received signal is demodulated, the synchronization signal being transmitted over a separate radio channel, characterized in that, in order to increase the noise immunity of the radio communication, after modulating the Walsh signals using frequency modulation, the signals in each channel are delayed by time - nt, where and - the number of the rope, ^G hey t- time, - the duration of the Walsh signal symbol, - the duration of the protective interval between the signals of various channels, and upon reception, the received signals are delayed for a while - Τ '- t ¹ pr ·' • su while where G _Su ^g ei ..... 'F ~ SU 1053302 Figure 1