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Examples of Communication Systems/General Description of UMTS
|Untermenü=UMTS – Universal Mobile Telecommunications System ...uced,  was intended to be a forward-looking alternative to the mobile communications systems used until then.  Compared with GSM,  UMTS not only offer

25 KB (3,834 words) - 15:00, 13 March 2023
Exercise 1.6Z: Comparison of Rayleigh and Rice
...e diagram of the factor  $z(t) = x(t) + {\rm j} \cdot y(t)$  for Rayleigh and Rice fading]] ...bsp; $z(t) = x(t) + {\rm j} \cdot y(t)$   in the complex plane.  For the low-pass transmission signal  $s(t) = 1$  $($which with respe

9 KB (1,455 words) - 14:19, 18 January 2023
Exercise 1.2: Lognormal Channel Model
...imately at a fixed distance  $d_0$  from the base station.  For example, it moves on an arc around the base station. * You can use the following (rough) approximations for the complementary Gaussian error integral:

6 KB (869 words) - 16:58, 2 July 2021
Exercise 2.7: Coherence Bandwidth
For the delay power-spectral density, we assume an exponential behavior.  ...au$ .  In the theory part we also use the term  $T_{\rm V}$ for this.

6 KB (1,000 words) - 13:41, 17 February 2022
Mobile Communications/Characteristics of UMTS
|Untermenü=Mobile Radio Systems of the 2nd and 3rd Generation - an Overview |Nächste Seite=General Information on the LTE Mobile Communications Standard

21 KB (3,247 words) - 18:44, 20 February 2023
Mobile Communications/Distance Dependent Attenuation and Shading
...nt transmission channels,  a property that is of great importance for mobile communication.  The description is given throughout in the equivalent #the non-frequency selective  »Rayleigh fading«   for channels without  »line of sight«  $\rm (LoS)$,

25 KB (4,083 words) - 15:23, 29 January 2023
Exercise 1.7: PDF of Rice Fading
[[File:P_ID2133__Mob_A_1_7.png|right|frame| Rice fading for different values of  $|z_0|^2$]] ...an processes   $\sigma^2 = 1$  and parameter  $|z_0|$  for the direct path.

7 KB (976 words) - 10:19, 7 July 2021
Exercise 3.2: GSM Data Rates
...h GSM is considered.  However, since this system was mainly specified for voice transmission, we usually use the duration  $T_{\rm R} = 20 \ \rm ...ypted) data bits are combined together with  $34$  control bits (for training sequence, tail bits, guard period) and a pause $($Duration:  

6 KB (916 words) - 14:38, 23 March 2021
Exercise 1.2Z: Lognormal Fading Revisited
...bsp; $m_{\rm S}$  of the lognormal fading  (the index "S" stands for Shadowing): The path loss model shown in the graphic is suitable for the scenario described here:

9 KB (1,312 words) - 14:38, 23 March 2021
Linear and Time Invariant Systems/System Description in Frequency Domain
...quo;system«  can generally be of any kind and is not limited to communications technology alone.  In fact,  attempts are also made in other fiel ...henomenological systems theories differ significantly from the approach in Communications Engineering,  which is outlined in this first main chapter of the pres

17 KB (2,685 words) - 18:50, 1 November 2023
Modulation Methods/Objectives of Modulation and Demodulation
...;demodulation«,  two classical and important methods for Communications Engineering,  which already have a very long tradition but are neverth ...troduces the definitions and descriptive variables which are equally valid for all systems. 

22 KB (3,220 words) - 15:09, 23 January 2023
Exercise 3.4Z: GSM Full-Rate Voice Codec
...ds for a joint realization of coder and decoder and combines three methods for the compression of speech signals: - The filter for short-term prediction is recursive.

6 KB (1,023 words) - 13:25, 23 January 2023
Exercise 2.8: COST Delay Models
...sk  '''(1)'''.  Note the specified values of   $\tau_{-30}$ for  ${\it \Phi}_{\rm V}(\tau_{-30})=-30 \ \rm dB$: For the models  ${\rm RA}$,  ${\rm TU}$  and  ${\rm BU}$&nb

15 KB (2,228 words) - 13:41, 17 February 2022
Exercise 1.4Z: On the Doppler Effect
The equations given in the theoretical section for the reception frequency are {Which Doppler frequencies result for the speeds  $v_1$  and  $v_2$  in driving direction &nb

8 KB (1,208 words) - 16:42, 28 May 2021
Exercise 4.10: Turbo Encoder for UMTS and LTE
[[File:EN_KC_A_4_10_v1.png|right|frame|Turbo encoder for UMTS and LTE]] The mobile communications standards  [[Mobile_Communications/Characteristics_of_UMTS|$\rm UMTS$]

11 KB (1,568 words) - 17:11, 22 December 2022
Modulation Methods/Error Probability of Direct-Sequence Spread Spectrum Modulation
|Vorherige Seite=Spreading Sequences for CDMA ...roperties of PN modulation are now given using the example of the American mobile radio standard  [https://en.wikipedia.org/wiki/CdmaOne $\text{IS–95}

20 KB (3,049 words) - 18:30, 23 January 2023
Exercise 3.5: GMSK Modulation
The modulation method used for GSM is  "Gaussian Minimum Shift Keying",  short  $\rm GMSK$. ...lta train).  It should be noted that the sequence drawn in is assumed for the subtask  '''(3)'''.

9 KB (1,524 words) - 08:08, 18 September 2022
Exercise 2.7: Two-Way Channel once more
...T_1$  and of the same strength as the signal on the main path.  For this, the transit time  $T_1$  is assumed. ...he subtasks  '''(1)''' ... '''(4)''',  the following is obtained for the frequency response of the two-way channel,  whose magnitude is dep

11 KB (1,757 words) - 17:11, 6 October 2021
Biographies and Bibliographies/LNTwww members from LNT
...e  "Lehrstuhl für Nachrichtentechnik"   ⇒   "Chair of Communications Engineering".  ...Institute for Telecommunications at the Heinrich Hertz Institute in Berlin for two months in 2002.

25 KB (3,806 words) - 12:43, 13 January 2022
Signal Representation/Differences and Similarities of Low-Pass and Band-Pass Signals
==Motivation of band-pass signals for Communications Engineering== There can be several reasons for this:

17 KB (2,652 words) - 16:37, 19 June 2023