Fundamentals of Information Processes 1 (Morhal, 2012)

Lecture notes compiled by O. M. Morhal for the Systems Engineering programme at the Department of Automation and Control in Technical Systems, KPI, 2012. The course sits one layer below computer networking: it never mentions a packet, and instead asks what happens to a waveform between a transmitter and a receiver. Its value now is as a map — it lays out the physical-layer territory in the order the problems actually appear — rather than as a reference for numbers, which are either timeless or thirty years stale depending on the chapter.

What the course covers #

1. 1–2 Transmission chain, signal classification and characteristics; Fourier series in trigonometric and complex form; worked spectra of rectangular, triangular and sawtooth signals.
2. 3 The three distortion families: amplitude-frequency, phase-frequency, and nonlinear — each with a different symptom and counter-measure.
3. 4–7 Modulation and reception: carrier parameter changes, pulse modulation and PCM, discrete-signal reception by minima/maxima and matched filters, and impulse-noise suppression.
4. 8–9 Electric filters: masks and parameters, LC ladders of type "k" and type "m", high-pass and band-pass derivations, active filters, notch filters, and resonators.
5. 9–11 Interference: shielding and frequency selection, narrowband, compensation and integral methods; impulse, concentrated and multiplicative noise; diversity in frequency, space, angle, and time.
6. 10–13 Transmission paths: primary line parameters and levels; pair, coax, waveguide, optical fibre; direct, relay, tropospheric, ionospheric, satellite, and optical wireless links.
7. 14 Channel multiplexing by frequency and time, including the synchronization and guard costs.
8. 15–17 Facsimile, television-image formation and transmission, and optical communication as complete application chains rather than isolated devices.
9. 18 Multi-channel systems, cable television, local networks, telemetry/data-collection systems, power-line communication, and mobile-object installations.

What is worth taking #

The distortion taxonomy is the spine of the course and it holds up. Splitting channel misbehaviour into amplitude-frequency, phase-frequency and nonlinear is not a classification exercise: each family has a different symptom, a different measurement, and a different fix. A channel that is flat in amplitude can still destroy a pulse through phase-frequency distortion alone, because group delay varies with frequency and the harmonics arrive misaligned. This is the same statement as group delay in a digital filter, arrived at from the analog side.

The interference chapter is unusually concrete for a lecture course. It does not stop at "use a filter": it separates the methods by what they exploit — narrowband reception exploits the bandwidth difference between signal and noise, compensation exploits a correlated reference of the interference, integration exploits the fact that noise averages toward zero while the signal does not. Choosing among them is a design decision that recurs far outside radio.

Diversity reception generalises well. Frequency, space, angle and time diversity are four ways of buying independent copies of the same message so that a fade that kills one does not kill all. The structure — independence is what makes redundancy pay — is the same argument that governs replica placement in a distributed system, and the course states the conditions for independence explicitly.

Where not to lean on it #

• LC filter synthesis of type "k" and "m" ladders is historically correct and practically obsolete for anything below microwave. It is the design method of the era when filters were built from discrete inductors and capacitors; today the same specification is met with an active or digital filter designed from a prototype. Read the chapter for where the terminology comes from, not for a design procedure.
• The transmission-line chapter predates the current fibre picture. Its treatment of optical links is brief and pre-coherent-detection; anything about capacity or reach should come from current sources.
• The course is Ukrainian-language and self-contained — it cites no external literature, so a claim that looks surprising cannot be traced back through it. Anything load-bearing needs a second source.

Relation to the bank #

This source is the reason the telecommunications territory is shaped the way it is: propagation and budgets, modulation, distortion and fading, coding, then systems. Where its physical-layer view meets the sampled-signal view of signal processing — group delay, filter response, spectra — the two describe one mechanism in two languages, and entries should say so rather than repeat it twice.

The full integration now has explicit destinations for the previously implicit transform and filter material: Fourier transform and the DFT, spectral estimation, and filter design. The facsimile and television chapters remain application history; their durable image-redundancy ideas feed the current image compression entry without carrying forward the analogue formats.

Source claims audit #