The paper presents an overview of design methodology and results of experiments with a Prototype of highly efficient optimal adaptive feedback communication systems (AFCS), transmitting low frequency analog signals without coding. The paper emphasizes the role of the forward transmitter saturation as the factor that blocked implementation of theoretical results of pioneer (1960-1970s) and later research on FCS. Deepened analysis of the role of statistical fitting condition in adequate formulation and solution of AFCS optimization task is given. Solution of the task – optimal transmission/reception algorithms is presented in the form useful for elaboration of the hardware/software Prototype. A notable particularity of the Prototype is absence of the encoding/decoding units, whose functions are realized by the adaptive pulse amplitude modulator (PAM) of the forward transmitter (FT) and estimating/controlling algorithm in the receiver of base station (BS). Experiments confirm that the Prototype transmits signals from FT to BS “perfectly”: with the bit rate equal to the capacity of the system, and with limit energy [J/bit] and spectral [bps/Hz] efficiency. Another, not less important and confirmed experimentally, particularity of AFCS is its capability to adjust parameters of FT and BS to the characteristics of scenario of application and maintain the ideal regime of transmission including spectralenergy efficiency. AFCS adjustment can be made using BS estimates of mean square error (MSE). The concluding part of the paper contains discussion of the presented results, stressing capability of AFCS to solve problems appearing in development of dense wireless networks.
The paper discusses particularities of optimal adaptive communication systems (AFCS) design conditioned by the particularities of their architecture and way of functioning, as well as by the approach to their design. The main one is that AFCS employ the analog method of transmission (in the paper - amplitude modulation), and are intended for short-range transmission of signals from the analog sources. Another one is that AFCS design is carried out on the basis of strict results of concurrent analytical optimisation of the transmitting and receiving parts of the system. Below, general problems appearing during transition from the theoretical results to the real engineering design, as well as approach to their solution are discussed. Some concrete tasks of AFCS design are also considered.
The goal of the paper is a discussion of general principle and stages of the optimal analog feedback communication systems (AFCS) design. Previous research devoted to the analysis of particularities of AFCS functioning gave necessary analytical basis for transition to practical design of optimal AFCS. This is new class of communication systems (CS) transmitting the signals, under given bit error rate (BER), with bit rate equal to the capacity of the forward channel and power-bandwidth efficiency attaining the theoretical limit. In the paper, we describe the ordered sequence of the stages of transition from the abstract results to designing of the pre-commercial versions of optimal AFCS considering them as the basic communication link “sensor node (SN)” - “base station” (BS) of the wireless sensor network (WSN). We also show that verified theoretical results enable analytically argued decision making at different stages of designing of the high quality and energy efficient WSN communication links. This facilitates optimisation of the project works schedule, distribution of the tasks and resources for their realization, reduce the time and cost of design.
KEYWORDS: Analytical research, Telecommunications, MATLAB, Systems modeling, Data acquisition, Model-based design, Data processing, Data modeling, Transmitters, Interference (communication)
It is shown in [1], feedback communication systems (FCS) with the analog feedback channel (AFCS) may explore the
recourses of forward transmission channels in the most effective way and transmit the signals at the rate equal to their
capacity. Designing of new AFCS requires deepened research of the work of the systems in different conditions, in many
cases difficult for theoretical study but available if the model-based simulations are used. In the paper, we discuss
particularities of the design and applications of flexible and interactive virtual research bench (VRB) for the analysis of
AFCS which is was developed in MATLAB computing environment.
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