Aufgaben:Exercise 3.2Z: Components of the GSM System - Revision history

Maintenance script: Add German interlanguage link

2026-03-16T12:27:10Z

Add German interlanguage link

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	[[Category:Mobile Communications: Exercises\|^3.2 Similarities between GSM and UMTS		[[Category:Mobile Communications: Exercises\|^3.2 Similarities between GSM and UMTS
	^]]		^]]
			[[de:Exercises:Exercise_3.2Z:_Components_of_the_GSM_System]]

Guenter at 16:26, 30 January 2023

2023-01-30T16:26:43Z

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	}}		}}
	[[File:~~EN_Mob_A_3_2_Z~~.png\|right\|frame\|GSM system components ~~'''Korrektur''' auch MOB 3.2Z~~]]		[[File:EN_Bei_Z_3_7.png\|right\|frame\|GSM system components]]
	The diagram shows the entire GSM transmission path,  with the transmitter on the left and the receiver on the right.		The diagram shows the entire GSM transmission path,  with the transmitter on the left and the receiver on the right.

Guenter at 16:02, 26 January 2023

2023-01-26T16:02:51Z

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	<u>Hint:</u>		<u>Hint:</u>
	*The ~~task~~ belongs to the chapter  [[Mobile_Communications/Similarities_Between_GSM_and_UMTS\|"Similarities between GSM and UMTS"]].		*The exercise belongs to the chapter  [[Mobile_Communications/Similarities_Between_GSM_and_UMTS\|"Similarities between GSM and UMTS"]].

	*Reference is also made to the chapter  [[Mobile_Communications/Characteristics_of_GSM\|"Characteristics of GSM"]].		*Reference is also made to the chapter  [[Mobile_Communications/Characteristics_of_GSM\|"Characteristics of GSM"]].

Guenter at 16:02, 26 January 2023

2023-01-26T16:02:01Z

← Older revision		Revision as of 18:02, 26 January 2023
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	<u>Hint:</u>		<u>Hint:</u>
	*The task belongs to the chapter  [[Mobile_Communications/Similarities_Between_GSM_and_UMTS\|Similarities between GSM and UMTS]].		*The task belongs to the chapter  [[Mobile_Communications/Similarities_Between_GSM_and_UMTS\|"Similarities between GSM and UMTS"]].

	*Reference is also made to the chapter  [[Mobile_Communications/Characteristics_of_GSM\|Characteristics of GSM]].		*Reference is also made to the chapter  [[Mobile_Communications/Characteristics_of_GSM\|"Characteristics of GSM"]].

Guenter at 16:01, 26 January 2023

2023-01-26T16:01:22Z

Show changes

Javier: Text replacement - "Category:Exercises for Mobile Communications" to "Category:Mobile Communications: Exercises"

2021-03-23T12:38:22Z

Text replacement - "Category:Exercises for Mobile Communications" to "Category:Mobile Communications: Exercises"

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	[[Category:~~Exercises for~~ Mobile Communications\|^3.2 Similarities between GSM and UMTS		[[Category:Mobile Communications: Exercises\|^3.2 Similarities between GSM and UMTS
	^]]		^]]

Guenter at 14:43, 20 January 2021

2021-01-20T14:43:58Z

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	{{ML-Kopf}}		{{ML-Kopf}}

	'''(1)'''  The ~~answers~~ <u>1 and 4</u> are correct:		'''(1)'''  The <u>answers 1 and 4</u> are correct:
	*The goal of speech ~~coding~~ is to compress data and thus reduce redundancy.		*The goal of voice encoding (or speech encoding) is to compress data and thus reduce redundancy.
	*This is a typical task of source coding.		*This is a typical task of source coding.


	'''(2)'''  The ~~answers~~ <u>2 and 3</u> are correct:		'''(2)'''  The <u>answers 2 and 3</u> are correct:
	*Convolutional coding is a form of channel coding that enables the receiver (decoder) to detect and possibly correct errors.		*Convolutional coding is a form of channel coding that enables the receiver (decoder) to detect and possibly correct errors.
	*The channel ~~coder~~ adds (meaningful) redundancy to this, while the ~~speech coder~~ removes irrelevant redundancy.		*The channel encoder adds (meaningful) redundancy to this, while the voice encoder removes irrelevant redundancy.
	*In many cases, both components are implemented together or at least closely coordinated		*In many cases, both components are implemented together or at least closely coordinated.
	*This is called ~~&bdquo;common source~~– and ~~channel coding”~~.		*This is called "Common Source– and Channel Coding".

	'''(3)'''  Only the ~~answer~~ <u>2</u> is correct:
			'''(3)'''  Only the <u>answer 2</u> is correct:
	*The convolution decoder has big problems if the transmission errors do not occur statistically independent, but bundled.		*The convolution decoder has big problems if the transmission errors do not occur statistically independent, but bundled.
	*Task of ~~Interleaver~~ and De–interleaver is to break up such bundle errors and distribute them over a longer period of time.		*Task of interleaver and de–interleaver is to break up such bundle errors and distribute them over a longer period of time.
	*The redundancy is not changed by this procedure.		*The redundancy is not changed by this procedure.
	*In the AWGN~~–~~channel, bit errors occur statistically independently, so that interleaver and de–interleaver can be dispensed with.		*In the AWGN channel, bit errors occur statistically independently, so that interleaver and de–interleaver can be dispensed with.



	'''(4)'''  The ~~answers~~ <u>1 and 4</u> are correct:		'''(4)'''  The <u>answers 1 and 4</u> are correct:
	*Encryption and decryption – the counterpart on the receiving side – serve only to protect user data against unauthorized access.		*Encryption and decryption – the counterpart on the receiving side – serve only to protect user data against unauthorized access.
	*They are not used for error correction and do not add redundancy.		*They are not used for error correction and do not add redundancy.
	*A distinction is made between symmetric and asymmetric encryption. GSM mainly uses the first variant.		*A distinction is made between symmetric and asymmetric encryption.  GSM mainly uses the first variant.

Guenter at 14:36, 20 January 2021

2021-01-20T14:36:09Z

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	The representation only refers to voice transmission.  In GSM data transmission, only the uppermost block (~~speech~~ encoder or decoder) is replaced by another channel encoder/decoder (concatenation of two channel codes).		The representation only refers to voice transmission.  In GSM data transmission, only the uppermost block (voice encoder or decoder) is replaced by another channel encoder/decoder (concatenation of two channel codes).

	This task deals with some basic properties of		This task deals with some basic properties of
	*~~speech coder~~ and ~~speech~~ decoder,		*voice encoder and voice decoder,
	*convolution encoder and convolution decoder,		*convolution encoder and convolution decoder,
	*interleaver and de-interleaver and		*interleaver and de–interleaver and
	*encryption and decryption.		*encryption and decryption.

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	<quiz display=simple>		<quiz display=simple>

	{Which statements apply to ~~speech coding~~ or decoding?		{Which statements apply to voice encoding or decoding?
	\|type="[]"}		\|type="[]"}
	+ They are components of source coding.		+ They are components of source coding.
	- They are components of channel coding.		- They are components of channel coding.
	- The ~~speech coder~~ adds redundancy.		- The voice encoder adds redundancy.
	+ The ~~speech coder~~ removes redundancy.		+ The voice encoder removes redundancy.

	{Which statements apply to the convolutional encoder/decoder?		{Which statements apply to the convolutional encoder/decoder?
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	\|type="[]"}		\|type="[]"}
	- The interleaver adds redundancy.		- The interleaver adds redundancy.
	+ The de-interleaver is used to distribute bundling errors.		+ The de–interleaver is used to distribute bundling errors.
	- The interleaver is most important in the AWGN channel.		- The interleaver is most important in the AWGN channel.

Guenter at 14:30, 20 January 2021

2021-01-20T14:30:12Z

← Older revision		Revision as of 16:30, 20 January 2021
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	The representation only refers to voice transmission. In GSM data transmission, only the uppermost block (speech encoder or decoder) is replaced by another channel encoder/decoder (concatenation of two channel codes).		The representation only refers to voice transmission.  In GSM data transmission, only the uppermost block (speech encoder or decoder) is replaced by another channel encoder/decoder (concatenation of two channel codes).

	This task deals with some basic properties of		This task deals with some basic properties of
	*speech coder and speech decoder,		*speech coder and speech decoder,
	*~~Convolution~~ encoder and convolution decoder,		*convolution encoder and convolution decoder,
	*~~Interleaver~~ and de-interleaver and		*interleaver and de-interleaver and
	*~~Encryption~~ and decryption.		*encryption and decryption.


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	''Notes:''		''Notes:''

	*The task belongs to the chapter  [[Mobile_Communications/~~Gemeinsamkeiten_von_GSM_und_UMTS~~\|~~Gemeinsamkeiten von~~ GSM ~~und~~		*The task belongs to the chapter  [[Mobile_Communications/Similarities_Between_GSM_and_UMTS\|Similarities between GSM and UMTS]].
	UMTS]].		*Reference is also made to the chapter  [[Mobile_Communications/Characteristics_of_GSM\|Characteristics of GSM]].
	*Reference is also made to the chapter  [[Mobile_Communications/~~Die_Charakteristika_von_GSM~~\|~~Die Charakteristika von~~ GSM]].


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	{What statements apply to the interleaver and de-interleaver?		{What statements apply to the interleaver and de-interleaver?
	\|type="[]"}		\|type="[]"}
	- The ~~Interleaver~~ adds redundancy.		- The interleaver adds redundancy.
	+ The de-interleaver is used to distribute bundling errors.		+ The de-interleaver is used to distribute bundling errors.
	- The interleaver is most important in the AWGN channel.		- The interleaver is most important in the AWGN channel.

Javier: Text replacement - "===Sample Solution===" to "===Solution==="

2020-12-15T14:10:33Z

Text replacement - "===Sample Solution===" to "===Solution==="

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	</quiz>		</quiz>

	===~~Sample~~ Solution===		===Solution===
	{{ML-Kopf}}		{{ML-Kopf}}