- •U n I t 1 telecommunications
- •1 Read and memorize the following words and word-combinations:
- •2 Translate the following word-combinations into English:
- •Telecommunication
- •1 Find in the text English equivalents to the following Russian words and word combinations:
- •6 Fill the blanks using the words below:
- •Telephone
- •1 Using the text give derivatives from the following words and translate them into Russian:
- •2 Fill the blanks using the words below:
- •3 Answer the following questions:
- •4 Translate the following sentences from English into Russian:
- •5 Read the text, describe the principal of telephone communication
- •Radio communications
- •1 Answer the following questions:
- •3 Choose from part II the appropriate continuation of the sentences.
- •4 Translate without using a dictionary.
- •5 Look at the following short descriptions of processes:
- •1 Using the information from the first three texts translate the following one from Russian into English.
- •U n I t 2 modulation
- •1 Read and memorize the following words and word-combinations:
- •2 Translate the following word-combinations into English:
- •Modulation
- •1 Answer the following questions:
- •2 Reply to the following sentences with a suitable question:
- •3 Translate the following fragment into English using the information from the text.
- •4 Make up a summary of the text using the cliché:
- •Digital and analog modulation methods
- •1 What do the following abbreviations stand for?
- •2 Translate the following sentences into English:
- •3 Choose from part II the appropriate continuation of the sentences.
- •4 Read the following paragraph. Fill in each blank with a suitable word given below.
- •5 Translate without using a dictionary
- •6 Make a brief summary of the text.
- •Modulator and demodulator
- •1 Translate the following word-combinations into Russian:
- •2 Answer the following questions:
- •3 Read the following paragraph. Fill in each blank with a suitable word given below.
- •4 Translate without using a dictionary.
- •1 Using the information from the first three texts translate the following one from Russian into English.
- •Модуляция и помехоустойчивое кодирование
- •U n I t 3
- •1 Read and memorize the following words and word-combinations:
- •2 Translate the following word-combinations into English:
- •Transmission systems
- •1 Answer the following questions:
- •2 Complete the following simple process description of the function of a terminal repeater station:
- •3 Complete the following tree diagram:
- •4 Read the following paragraph. Fill in each blank with a suitable word given below.
- •Why optical fibers are useful and how they work
- •1 Below are the advantages of optical fibers. Match them with an appropriate explanation:
- •2 Discuss the importance of the above advantages in using optical fiber in public telephone networks. Try to rank the above advantages in order of importance.
- •3 Complete the following tables:
- •4 Read the following paragraph. Fill in each blank with a suitable word given below.
- •5 Reply to the following sentences with a suitable question:
- •6 Make a brief summary of the text.
- •1 Answer the following questions:
- •2 Read the following paragraph. Fill in each blank with a suitable word given below.
- •3 Translate the following sentences into English:
- •1 Using the information from the first three texts translate the following one from Russian into English.
- •Оптоволокно
- •U n I t 4
- •1 Read and memorize the following words and word-combinations:
- •2 Translate the following word-combinations into English:
- •Telephone exchanges
- •1 Answer the following questions:
- •2 Complete the following table: Main characteristics of the systems
- •3 Choose from part II the appropriate continuation of the sentences.
- •4 Put the verb in brackets into the correct tense.
- •5 Read the following paragraph. Fill in each blank with a suitable word given below.
- •6 Make up a summary of the text using the cliché:
- •Switching technologies
- •1 Integrated Digital Transmission and Switching
- •1 Complete the following table:
- •3 What are the advantages of using (large-scale) integrated circuits in an exchange?
- •4 Match the following terms with a suitable explanation:
- •5 Translate the following sentences into Russian:
- •Public Data Networks
- •1 Answer the following questions:
- •2 Match the facilities with the appropriate description:
- •3 Discuss in what situations and for which user groups the above facilities would be useful.
- •1 Using the information from the first three texts translate the following one from English into Russian.
- •Digital switches
- •Оглавление
- •Английский язык
- •246653, Г. Гомель, ул. Кирова, 34.
- •Английский язык
- •246653, Г. Гомель, ул. Кирова, 34.
1 What do the following abbreviations stand for?
1 FM 6 PAM 11 AFSK
2 PM 7 ASK 12 CPM
3 RF 8. QAM 13 SSB-AM
4 FDM 9 VSM 14 VSB-AM
5 PSK 10 OFDM 15 SSB-SC
2 Translate the following sentences into English:
1 Энергетическая эффективность определяет минимальную мощность передатчика, необходимую для приемлемой работы.
2 Спектральная эффективность – отношение скорости передачи данных к необходимой полосе пропускания радиоканала.
3 На сигнал могут воздействовать такие специфичные искажения как замирание вследствие многолучевого распространения, ограничение полосы, сосредоточенные по частоте и времени помехи и др.
4 Вероятность ошибки идеального демодулятора зависит от отношения сигнал/шум.
5 Для усиления сигналов с некоторыми видами модуляции могут быть использованы нелинейные усилители класса С.
3 Choose from part II the appropriate continuation of the sentences.
1 Digital baseband modulation or line codes are methods to transfer a digital bit stream over an analog low pass channel ………..
2 Each of these phases, frequencies or amplitudes …………..
3 Usually, each phase, frequency or amplitude…………
4 PSK and ASK, and sometimes also FSK, are often generated and detected……
5 The QAM principle can generate…………
6 Any possible band-limited signal can be decomposed………….
7 The I and Q signals can be combined into a complex valued signal………….
8 This number of bits comprises the symbol that is…………..
9 The resulting signal is a combination of PSK and ASK,…………
II 1 ….using QAM into the baseband I and Q signals necessary to generate it.
2 …. called the equivalent low pass signal or equivalent baseband signal.
3 … using the principle of QAM.
4 …. represented by the particular phase.
5 ….encodes an equal number of bits.
6 ….are assigned a unique pattern of binary bits.
7 …. with a finite number of at least two phases, and a finite number of at least two amplitudes.
8 ….any possible band-limited signal.
9.….using a discrete number of signal levels, by directly modulating the voltage or current on a cable.
4 Read the following paragraph. Fill in each blank with a suitable word given below.
Channel, scheme, allowing, data, medium, into, on, different, transfers, sub-carrier, share, modulation, than, over, considered, extended, summarized.
OFDM is based ______the idea of Frequency Division Multiplex (FDM), but is utilized as a digital _______scheme. The bit stream is split ______several parallel _______streams, each transferred over its own _______using some conventional digital modulation______. The sub-carriers are ______into an OFDM symbol. OFDM is _______as a modulation technique rather ______a multiplex technique, since it ______one bit stream ______one communication______using one sequence of so-called OFDM symbols. OFDM can be ______to multi-user channel access method in the Orthogonal Frequency Division Multiple Access (OFDMA) and MC-OFDM schemes, ______several users to ______the same physical ______by giving ______sub-carriers to different users.