Aufgaben:Exercise 3.6: FDMA, TDMA and CDMA - Revision history

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

2021-03-23T12:38:15Z

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

Guenter at 16:30, 24 February 2021

2021-02-24T16:30:53Z

Guenter at 16:26, 24 January 2021

2021-01-24T16:26:35Z

Guenter at 15:42, 24 January 2021

2021-01-24T15:42:46Z

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

2020-12-16T13:16:19Z

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

Javier: Text replacement - "Mobile Kommunikation/Die Charakteristika von UMTS" to "Mobile_Communications/Characteristics_of_UMTS"

2020-12-15T14:04:21Z

Text replacement - "Mobile Kommunikation/Die Charakteristika von UMTS" to "Mobile_Communications/Characteristics_of_UMTS"

Javier: Text replacement - "[[Modulationsverfahren" to "[[Modulation_Methods"

2020-07-09T12:59:53Z

Text replacement - "[[Modulationsverfahren" to "[[Modulation_Methods"

Javier: Text replacement - "[[Beispiele_von_Nachrichtensystemen" to "[[Examples_of_Communication_Systems"

2020-07-09T12:56:36Z

Text replacement - "[[Beispiele_von_Nachrichtensystemen" to "[[Examples_of_Communication_Systems"

Javier: Text replacement - "Mobile_Kommunikation/" to "Mobile_Communications/"

2020-07-09T09:13:16Z

Text replacement - "Mobile_Kommunikation/" to "Mobile_Communications/"

Oezdemir: /* Sample solution */

2020-07-02T15:08:11Z

Sample solution

← Older revision		Revision as of 12:38, 23 March 2021
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−	[[Category:~~Exercises for~~ Mobile Communications\|^3.4 Characteristics of UMTS^]]	+	[[Category:Mobile Communications: Exercises\|^3.4 Characteristics of UMTS^]]

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 *Notes on the communication systems considered here can be found under the following links:<br>
-::[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_GSM#.23_.C3.9CBERBLICK_ZUM_DRITTEN_HAUPTKAPITEL_.23|GSM]]&nbsp; (Global System for Mobile Communications),
+#&nbsp;[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_GSM#.23_.C3.9CBERBLICK_ZUM_DRITTEN_HAUPTKAPITEL_.23|GSM]]&nbsp; (Global System for Mobile Communications),
+#&nbsp;[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_UMTS#.23_.C3.9CBERBLICK_ZUM_VIERTEN_HAUPTKAPITEL_.23|UMTS]]&nbsp; (Universal Mobile Communications Systems),
-::[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_UMTS#.23_.C3.9CBERBLICK_ZUM_VIERTEN_HAUPTKAPITEL_.23|UMTS]]&nbsp; (Universal Mobile Communications Systems),
+#&nbsp;[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_DSL#.23_.C3.9CBERBLICK_ZUM_ZWEITEN_HAUPTKAPITEL_.23|DSL]]&nbsp; (Digital Subscriber Line).
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 '''(1)'''&nbsp; Correct is the <u>solution 2</u>:
 *FDMA, TDMA and CDMA are multiple access or multiplexing techniques,
-*which are then, however, abbreviated as FDM, TDM and CDM: &nbsp; ''Frequency (Time, Code) Division Multiplexing''.
+*which are then, however, abbreviated as FDM, TDM and CDM: &nbsp; "Frequency (Time, Code) Division Multiplexing"'.
@@ Line 103: / Line 101: @@
 '''(5)'''&nbsp; Only  <u>solution 1</u> is correct:
-*For "Fast Internet" connections nowadays, it is common to use&nbsp;  [[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_DSL#.23_.C3.9CBERBLICK_ZUM_ZWEITEN_HAUPTKAPITEL_.23|$\rm DSL$]]&nbsp; (Digital Subscriber Line).
+*For "Fast Internet" connections nowadays, it is common to use&nbsp;  [[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_DSL#.23_.C3.9CBERBLICK_ZUM_ZWEITEN_HAUPTKAPITEL_.23|$\rm DSL$]]&nbsp; ("Digital Subscriber Line").
-*This is based on&nbsp;  [[Modulation_Methods/Allgemeine_Beschreibung_von_OFDM#Das_Prinzip_von_OFDM_.E2.80.93_Systembetrachtung_im_Zeitbereich|$\rm OFDM$]]&nbsp;  (Orthogonal Frequency Division Multiplexing), which is an FDM version.
+*This is based on&nbsp;  [[Modulation_Methods/Allgemeine_Beschreibung_von_OFDM#Das_Prinzip_von_OFDM_.E2.80.93_Systembetrachtung_im_Zeitbereich|$\rm OFDM$]]&nbsp;  ("Orthogonal Frequency Division Multiplexing"), which is an FDM version.
 *The individual spectra are not separated, however, but overlap.&nbsp; There is still no mutual influence due to the orthogonality.

@@ Line 78: / Line 78: @@
-'''(2)'''&nbsp; Only the <u>both last solutions</u> are correct:
+'''(2)'''&nbsp; Correct are the <u>solutions 2 and 3</u>:
 *FDMA/FDM can also be used in analog systems, of which classical broadcasting (since the 1930s) is an example.
@@ Line 84: / Line 84: @@
 '''(3)'''&nbsp; Correct are the <u>solutions 1 and 2</u>:
-*At mobile radio standard [[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_GSM#.23_.C3.9CBERBLICK_ZUM_DRITTEN_HAUPTKAPITEL_.23|GSM]], FDMA and TDMA are used.
+*At mobile radio standard&nbsp; [[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_GSM#.23_.C3.9CBERBLICK_ZUM_DRITTEN_HAUPTKAPITEL_.23|GSM]],&nbsp; FDMA and TDMA are used.
-*Im so genannten D–Band (Uplink von $890$ bis $915 \ \rm MHz$, Downlink von $935$ bis $960 \ \rm MHz$) gibt es unter Berücksichtigung der Guard–Bänder von je $100 \ \rm kHz$ am oberen und unteren Bereichsende in jeder Richtung $124$ FDMA–Kanäle zu je $200
- \ \rm kHz$.
+*In the so-called "D-band"&nbsp; (uplink from&nbsp; $890$&nbsp; to&nbsp; $915 \ \rm MHz$, downlink from&nbsp; $935$&nbsp; to&nbsp; $960 \ \rm MHz$), there are&nbsp; $124$&nbsp; FDMA channels of&nbsp; $200 \ \rm kHz$,&nbsp; taking into account the guard bands of&nbsp; $100 \ \rm kHz$&nbsp; at the upper and lower end of the range in each direction.
-*Im E–Band (Uplink: $1710 – 1785 \ \rm MHz$, Downlink: $1805 – 1880 \ \rm MHz$) sind $374$ FDMA–Kanäle nutzbar.
+*In the "E-band"&nbsp; (uplink: $1710 - 1785 \ \rm MHz$,&nbsp; downlink: $1805 - 1880 \ \rm MHz$),&nbsp; $374$&nbsp; FDMA channels can be used.
-*Time division multiplex (TDMA) can be used to provide  $8$ users additionally in each frequency band. A TDMA frame has a length of $4,615 \ \rm ms$, so that time slots of $0,577 \ \ \rm ms$ duration are available for each user in this time interval.
+*Time Division Multiple Access (TDMA) can be used to provide eight users additionally in each frequency band.&nbsp; A TDMA frame has a length of&nbsp; $4.615 \ \rm ms$, so that time slots of&nbsp; $0.577 \ \ \rm ms$&nbsp; duration are available for each user in this time interval.
 '''(4)'''&nbsp; Correct are  <u>the solutions 2 and 3</u>:
-*The UMTS variant ''UMTS Terrestrial Radio Access-Frequency Division Duplex'' (''UTRA-FDD'') used exclusively in Germany consists of $12$ paired uplink and downlink frequency bands of $5 \ \rm MHz$ bandwidth each.
+*The UMTS variant "UMTS Terrestrial Radio Access&nbsp;-&nbsp;Frequency Division Duplex"&nbsp; $\text{(UTRA-FDD)}$&nbsp; used exclusively in Germany consists of&nbsp; $12$&nbsp; paired uplink and downlink frequency bands of&nbsp; $5 \ \rm MHz$&nbsp; bandwidth each,
 ** between $1920 \ \rm MHz$ and $1980 \ \rm MHz$ (uplink) or
 ** between $2110 \ \rm MHz$ and $2170 \ \rm MHz$ (downlink).
-*So you could definitely speak of an FDMA system. However, the various $5 \ \rm MHz$ bands are used by other network operators.
+*So you could definitely speak of an&nbsp; $\rm FDMA$&nbsp; system.&nbsp; However, the various&nbsp; $5 \ \rm MHz$&nbsp; bands are used by other network operators.
-*If, on the other hand, one considers a $5 \ \rm MHz$ band on its own, UMTS does not have an FDMA component. In each of the bands, '''CDMA''' is implemented instead, so that up to $512$ users can be active simultaneously in each frequency band. And to some extent '''TDMA''' (time slots, frames, TTI) is also used.
+*If, on the other hand, one considers a&nbsp; $5 \ \rm MHz$&nbsp; band on its own, UMTS does not have an FDMA component.&nbsp; In each of the bands,&nbsp; $\rm CDMA$&nbsp; is implemented instead, so that up to&nbsp; $512$&nbsp; users can be active simultaneously in each frequency band.&nbsp; And to some extent&nbsp; $\rm TDMA$&nbsp; (time slots, frames, TTI) is also used.
 '''(5)'''&nbsp; Only  <u>solution 1</u> is correct:
-*For fast Internet connections nowadays, it is common to use  [[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_DSL#.23_.C3.9CBERBLICK_ZUM_ZWEITEN_HAUPTKAPITEL_.23|DSL]] (''Digital Subscriber Line'').
+*For "Fast Internet" connections nowadays, it is common to use&nbsp;  [[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_DSL#.23_.C3.9CBERBLICK_ZUM_ZWEITEN_HAUPTKAPITEL_.23|$\rm DSL$]]&nbsp; (Digital Subscriber Line).
-*OFDM is based on [[Modulation_Methods/Allgemeine_Beschreibung_von_OFDM#Das_Prinzip_von_OFDM_.E2.80.93_Systembetrachtung_im_Zeitbereich|OFDM]]  (''Orthogonal Frequency Division Multiplexing''), which is an FDM version.
+*This is based on&nbsp;  [[Modulation_Methods/Allgemeine_Beschreibung_von_OFDM#Das_Prinzip_von_OFDM_.E2.80.93_Systembetrachtung_im_Zeitbereich|$\rm OFDM$]]&nbsp;  (Orthogonal Frequency Division Multiplexing), which is an FDM version.
-*The individual spectrums are not separated, however, but overlap.
+*The individual spectra are not separated, however, but overlap.&nbsp; There is still no mutual influence due to the orthogonality.
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 }}
-[[File:EN_Mob_A_3_7.png|right|frame|Schaubilder für FDMA, <br>TDMA und CDMA]]
+[[File:EN_Mob_A_3_7.png|right|frame|Charts for FDMA, <br>TDMA und CDMA]]
-The diagram illustrates the principle of
+The diagrams illustrate the principle of
-*''Frequency Division Multiple Access'' (FDMA),
+*Frequency Division Multiple Access&nbsp; $\rm (FDMA)$,
-*''Time Division Multiple Access'' (TDMA), and
+*Time Division Multiple Access&nbsp; $\rm (TDMA)$,&nbsp; and
-*''Code Division Multiple Access'' (CDMA).
+*Code Division Multiple Access&nbsp; $\rm (CDMA)$.
-The multiple access methods listed here are based on the assumption that there are several transmitter-receiver pairs that share a transmission medium independently.
+The multiple access methods listed here are based on the assumption that there are several transmitter&ndash;receiver pairs that share a transmission medium independently.
-On the other hand, multiplexing occurs when a multiplexer (MUX) bundles several signals at the beginning of transmission and a demultiplexer (DEMUX) splits the common signal at the end. In this case, FDM, TDM and CDM are abbreviated to ''Frequency (Time, Code) Division Multiplexing''.
+On the other hand, multiplexing occurs when a multiplexer&nbsp; $\rm (MUX)$&nbsp; bundles several signals at the beginning of transmission and a demultiplexer&nbsp; $\rm (DEMUX)$&nbsp; splits the common signal at the end.&nbsp; In this case, FDM, TDM and CDM are abbreviated to&nbsp; "Frequency (Time, Code) Division Multiplexing".
 The task is to determine which of these methods (FDMA/FDM, TDMA/TDM, CDMA/CDM) is used by some of today's most important communications systems (GSM, UMTS, DSL).
@@ Line 20: / Line 20: @@
 ''Notes:''
-*This task refers to the chapter [[Mobile_Communications/Die_Charakteristika_von_UMTS|Die Charakteristika von UMTS]].
+*This task refers to the chapter [[Mobile_Communications/Characteristics_of_UMTS|Characteristics of UMTS]].
 *Notes on the communication systems considered here can be found under the following links:<br>
-::[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_GSM#.23_.C3.9CBERBLICK_ZUM_DRITTEN_HAUPTKAPITEL_.23|GSM]] (''Global System for Mobile Communications''),
+::[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_GSM#.23_.C3.9CBERBLICK_ZUM_DRITTEN_HAUPTKAPITEL_.23|GSM]]&nbsp; (Global System for Mobile Communications),
-::[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_UMTS#.23_.C3.9CBERBLICK_ZUM_VIERTEN_HAUPTKAPITEL_.23|UMTS]] (''Universal Mobile Communications Systems''),
+::[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_UMTS#.23_.C3.9CBERBLICK_ZUM_VIERTEN_HAUPTKAPITEL_.23|UMTS]]&nbsp; (Universal Mobile Communications Systems),
-::[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_DSL#.23_.C3.9CBERBLICK_ZUM_ZWEITEN_HAUPTKAPITEL_.23|DSL]] (''Digital Subscriber Line'').
+::[[Examples_of_Communication_Systems/Allgemeine_Beschreibung_von_DSL#.23_.C3.9CBERBLICK_ZUM_ZWEITEN_HAUPTKAPITEL_.23|DSL]]&nbsp; (Digital Subscriber Line).
@@ Line 38: / Line 38: @@
 {What do FDMA, TDMA and CDMA mean?
 |type="[]"}
-- Modulation method,
+- Modulation methods,
-+ Multiple access method,
++ Multiple access methods,
-- Equalization procedure.
+- Equalization procedures.
 {Which of these procedures are only applicable to digital systems?
@@ Line 60: / Line 60: @@
 + CDMA/CDM.
-{What technology(ies) uses the "fast internet" (DSL)?
+{What technology(ies) uses the "Fast Internet" (DSL)?
 |type="[]"}
 + FDMA/FDM,

← Older revision		Revision as of 14:04, 15 December 2020
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−	{{quiz-Header\|Buchseite=~~Mobile Kommunikation~~/~~Die Charakteristika von UMTS~~	+	{{quiz-Header\|Buchseite=Mobile_Communications/Characteristics_of_UMTS
	}}		}}

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 </quiz>
-===Sample solution===
+===Solution===
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