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

Guenter at 16:26, 30 January 2023

2023-01-30T16:26:43Z

Guenter at 16:02, 26 January 2023

2023-01-26T16:02:51Z

Guenter at 16:02, 26 January 2023

2023-01-26T16:02:01Z

Guenter at 16:01, 26 January 2023

2023-01-26T16:01:22Z

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"

Guenter at 14:43, 20 January 2021

2021-01-20T14:43:58Z

Guenter at 14:36, 20 January 2021

2021-01-20T14:36:09Z

Guenter at 14:30, 20 January 2021

2021-01-20T14:30:12Z

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

2020-12-15T14:10:33Z

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

Javier: Text replacement - "Mobile Kommunikation/Gemeinsamkeiten von GSM und UMTS" to "Mobile_Communications/Similarities_Between_GSM_and_UMTS"

2020-12-15T14:02:16Z

Text replacement - "Mobile Kommunikation/Gemeinsamkeiten von GSM und UMTS" to "Mobile_Communications/Similarities_Between_GSM_and_UMTS"

@@ Line 4: / Line 4: @@
 }}
-[[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,&nbsp; with the transmitter on the left and the receiver on the right.

@@ Line 24: / Line 24: @@
 <u>Hint:</u>
-*The task belongs to the chapter&nbsp; [[Mobile_Communications/Similarities_Between_GSM_and_UMTS|"Similarities between GSM and UMTS"]].
+*The exercise belongs to the chapter&nbsp; [[Mobile_Communications/Similarities_Between_GSM_and_UMTS|"Similarities between GSM and UMTS"]].
 *Reference is also made to the chapter&nbsp;  [[Mobile_Communications/Characteristics_of_GSM|"Characteristics of GSM"]].

@@ Line 24: / Line 24: @@
 <u>Hint:</u>
-*The task belongs to the chapter&nbsp; [[Mobile_Communications/Similarities_Between_GSM_and_UMTS|Similarities between GSM and UMTS]].
+*The task belongs to the chapter&nbsp; [[Mobile_Communications/Similarities_Between_GSM_and_UMTS|"Similarities between GSM and UMTS"]].
-*Reference is also made to the chapter&nbsp;  [[Mobile_Communications/Characteristics_of_GSM|Characteristics of GSM]].
+*Reference is also made to the chapter&nbsp;  [[Mobile_Communications/Characteristics_of_GSM|"Characteristics of GSM"]].

@@ Line 4: / Line 4: @@
 }}
-[[File:EN_Mob_A_3_2_Z.png|right|frame|GSM system components]]
+The illustration refers only to speech transmission.&nbsp; In GSM data transmission,&nbsp; only the top block&nbsp; $($speech encoder or decoder$)$&nbsp; is replaced by another channel encoder or decoder&nbsp; $($concatenation of two channel codes$)$.
-The representation only refers to voice transmission.&nbsp; In GSM data transmission, only the uppermost block (voice encoder or decoder) is replaced by another channel encoder/decoder (concatenation of two channel codes).
+In this exercise,&nbsp; on the other hand,&nbsp; some basic properties are queried from
-This task deals with some basic properties of
+*convolutional encoder and convolutional decoder,
 *Reference is also made to the chapter&nbsp;  [[Mobile_Communications/Characteristics_of_GSM|Characteristics of GSM]].
 <quiz display=simple>
+{Which statements are true for speech encoding/decoding?
 |type="[]"}
-+ They are components of source coding.
++ These are source coding components.
 - They are components of channel coding.
-- The voice encoder adds redundancy.
+- Redundancy is added by the speech encoder.
-+ The voice encoder  removes redundancy.
++ Redundancy is removed by the speech encoder.
-{Which statements apply to the convolutional encoder/decoder?
+{Which statements are true for the convolutional encoder or decoder?
 |type="[]"}
-- These are components of the source coding.
+- They are components of source coding.
-+ These are components of the channel coding.
++ They are components of channel coding.
 + Redundancy is added by the convolutional encoder.
 - Redundancy is removed by the convolutional encoder.
-{What statements apply to the interleaver and de-interleaver?
+{Which statements are true for the interleaver and de-interleaver?
 |type="[]"}
 - The interleaver adds redundancy.
-+ The de&ndash;interleaver is used to distribute bundling errors.
++ The interleaver is used to distribute bundle errors.
-- The interleaver is most important in the AWGN channel.
+- The interleaver has the most significance for the AWGN channel.
-{What statements apply to encryption and decryption?
+{Which statements are true for encryption and decryption?
 |type="[]"}
 + Both serve data security in the sense of data protection.
-- These components are used for error correction.
+- These components are for error correction.
-- The encryption adds redundancy.
+- Encryption adds redundancy.
-+ GSM usually uses symmetric encryption.
++ GSM mostly uses symmetric encryption.
 </quiz>
 ===Solution===
 {{ML-Kopf}}
 *This is a typical task of source coding.
-'''(4)'''&nbsp; The <u>answers 1 and 4</u> are correct:
+'''(4)'''&nbsp; Correct are the&nbsp; <u>answers 1 and 4</u>:
-*Encryption and decryption &ndash; the counterpart on the receiving side &ndash; serve only to protect user data against unauthorized access.
+*Encryption and decryption&nbsp; (the counterpart on the receiving side)&nbsp; are used solely to protect user data from unauthorized access.
-*They are not used for error correction and do not add redundancy.
-*A distinction is made between symmetric and asymmetric encryption.&nbsp; GSM mainly uses the first variant.
+*They are not used for error correction,&nbsp; nor do they add redundancy.

← Older revision		Revision as of 12:38, 23 March 2021
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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
	^]]		^]]

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 {{ML-Kopf}}
-'''(1)'''&nbsp; The answers <u>1 and 4</u> are correct:
+'''(1)'''&nbsp; 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.
-'''(2)'''&nbsp; The answers <u>2 and 3</u> are correct:
+'''(2)'''&nbsp; 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.
-*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&ndash; and channel coding&rdquo;.
+*This is called "Common Source&ndash; and Channel Coding".
-'''(3)'''&nbsp; Only the answer <u>2</u> is correct:
 *The convolution decoder has big problems if the transmission errors do not occur statistically independent, but bundled.
-*Task of Interleaver and De&ndash;interleaver is to break up such bundle errors and distribute them over a longer period of time.
+*Task of interleaver and de&ndash;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.
-*In the AWGN&ndash;channel, bit errors occur statistically independently, so that interleaver and de&ndash;interleaver can be dispensed with.
+*In the AWGN channel, bit errors occur statistically independently, so that interleaver and de&ndash;interleaver can be dispensed with.
-'''(4)'''&nbsp; The answers <u>1 and 4</u> are correct:
+'''(4)'''&nbsp; The <u>answers 1 and 4</u> are correct:
 *Encryption and decryption &ndash; the counterpart on the receiving side &ndash; serve only to protect user data against unauthorized access.
 *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.&nbsp; GSM mainly uses the first variant.

@@ Line 11: / Line 11: @@
-The representation only refers to voice transmission.&nbsp; 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.&nbsp; 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
-*speech coder and speech decoder,
+*voice encoder and voice decoder,
 *convolution encoder and convolution decoder,
-*interleaver and de-interleaver and
+*interleaver and de&ndash;interleaver and
 *encryption and decryption.
@@ Line 38: / Line 38: @@
 <quiz display=simple>
-{Which statements apply to speech coding or decoding?
+{Which statements apply to voice encoding or decoding?
 |type="[]"}
 + They are components of source 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?
@@ Line 55: / Line 55: @@
 |type="[]"}
 - The interleaver adds redundancy.
-+ The de-interleaver is used to distribute bundling errors.
++ The de&ndash;interleaver is used to distribute bundling errors.
 - The interleaver is most important in the AWGN channel.

← Older revision		Revision as of 14:02, 15 December 2020
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−	{{quiz-Header\|Buchseite=~~Mobile Kommunikation~~/~~Gemeinsamkeiten von GSM und UMTS~~	+	{{quiz-Header\|Buchseite=Mobile_Communications/Similarities_Between_GSM_and_UMTS

	}}		}}