Abstract.
This paper considers the transmission of binary messages. Elements of binary
messages follow with an interval of T0. Before sending the
binary message is divided into blocks. The unit consists of two message
elements. Blocks arrive for transmission with an interval 2T0.
For each transmission of a block element opposite elementary signal with
duration T = 4T0 are used. Thus, the transmitted
elementary signals overlap in time. Elementary signals corresponding to unit
elements fully overlap in time. Elementary signals corresponding to elements of
neighboring blocks overlap by the amount T/2. We determined the frequency band
occupied by the transmitted signal. This frequency band is equal to 2.36/T.
99% of the signal power is concentrated in this frequency band. The reception of
message elements was carried out on the basis of linear independence of the
elementary signals. The estimation of the noise immunity of transmission was
carried out for the case of interference in the form of white noise. The
proposed method of transmitting binary messages allows one to obtain good
frequency efficiency without the use of a spectrum shaper. Frequency efficiency
(the ratio of the bandwidth to the speed of transmission of binary message
elements) is equal to 0.59. The proposed method of transfer, under certain
conditions, can be considered as an alternative to quadrature amplitude
modulation.
Key words:
overlapping
signals, frequency band, noise immunity.
References
1.
V.
A.
Vershinin.
The transmission of binary messages by simplex signals.
Zhurnal Radioelektroniki - Journal of Radio Electronics. 2013. No.
11. Available at
http://jre.cplire.ru/jre/nov13/5/text.pdf
(In Russian)
2.
Dyadyunov N.G., Senin A.I. Ortogonal'nye i
kvaziortogonal'nye signaly. [Ortogonal and quazi-ortogonal signals]. Edited
by Tarasenko A.M. Moscow, Svyaz Publ., 1977, 224 p. (In Russian)
3.
Zyuko A.G., Klovskiy D.D., Korzhik V.I., Nazarov M.V. Teoriya elektricheskoy
svyazi. [The theory of electrical connection]. Edited by Klovskiy D.D.
Moscow, Radio i svyaz Publ., 1998. 432 p. (In Russian)