Noise Immunity of a Coherent Signal Receiver with Quadrature Amplitude Modulation in the Presence of Relayed Interferenc
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RY AND METHODS OF SIGNAL PROCESSING
Noise Immunity of a Coherent Signal Receiver with Quadrature Amplitude Modulation in the Presence of Relayed Interference G. V. Kulikova, *, A. A. Lelyukha, and E. N. Grachenkoa a
MIREA—Russian Technological University, Moscow, 119454 Russia *e-mail: [email protected] Received June 20, 2019; revised June 20, 2019; accepted July 10, 2019
Abstract—Using statistical radioengineering methods, we analyzed the noise immunity of the receiving of the signals with multiposition quadrature amplitude modulation (M-QAM) in the presence of noise and relayed interference in the radio channel. It is shown that the reception quality of signals with M-QAM is susceptible to the influence of such interference, and this effect increases as the positioning of the signals increases. It is also established that the noise immunity for the reception of M-QAM signals is significantly better against the background of relayed interference than that of similarly positioned M-PSK signals. DOI: 10.1134/S1064226920070074
INTRODUCTION
1. SIGNAL AND INTERFERENCE MODELS
The rapid development of telecommunication technologies is dictating continuously stricter requirements on information transmission rates and noise immunity for the reception of signals in a limited communication channel bandwidth. One way to solve the problem is to use multiposition signals. This is typical, for example, for the existing digital terrestrial and satellite television systems implemented based on the DVB-S and DVB-S2/S2X standards1, 2. Using these standards, aviation systems for high-speed data transmission for airmobile subscribers inflight are also being built. This segment is being actively developed abroad and is just beginning to be developed in Russia. Modulation-coding schemes are based, among other things, on the use of signals with multiposition quadrature amplitude modulation (M-QAM) [1]. In such radio systems, nonfluctuating signal-like interference can be present at the receiver’s input together with the noise. The relayed interference caused by the multipath nature of the propagation of radio waves is amongst the most commonly encountered interference. There is no detailed analysis of the noise immunity for receiving M-QAM signals in such an interference environment in the literature. The purpose of the work is to analyze the noise immunity for a coherent signal receiver with M-QAM in the presence of relayed and noise interference.
An M-QAM signal at a clock interval equal to the duration of the channel symbol Ts carrying information on log2 M information bits can take one of M possible values:
1 https://dvb.org/wp-content/uploads/2019/12/a171-1_s2_guide.pdf. 2 https://dvb.org/?standard=dvb-s2x-implementation-guidelines.
si (t ) = Aav (I i cos ω0t − Qi sin ω0t ), t ∈ (0,Ts ], i = 0,1,...M − 1,
(1)
where Aav = 2Esav Т s is the average signal amplitude ( Esav = E bav log2 M is the energy of the channel symbol, the average of all informational combinations; Ebav is the average energy per bit of information); Ii and
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