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Modulation Methods/Objectives of Modulation and Demodulation
# the  »signal-to-noise power ratio«  as a very general quality criterion, ...lytical signal«  and the  »equivalent low–pass signal«.

22 KB (3,220 words) - 15:09, 23 January 2023
Theory of Stochastic Signals/Further Distributions
[[File:P_ID62__Sto_T_3_7_S1_neu.png |right|frame|Sample signal and PDF of a Rayleigh distributed random variable|class=fit]] One can see from this representation:

12 KB (1,790 words) - 11:03, 22 December 2022
Digital Signal Transmission/Structure of the Optimal Receiver
*the basis functions and the signal space representation according to the chapter  [[Digital_Signal_Transmission/Signals,_Basis *For the transmission,  $M$  different signal forms  $s_i(t)$  are available;  for the indexing variable s

39 KB (6,156 words) - 16:18, 23 January 2023
Digital Signal Transmission/Redundancy-Free Coding
...(t)$  corresponds to the bit duration  $T_q$  of the source signal,  which is assumed to be binary and redundancy-free.<br> ...;$16\%$.  Because of  ${T_c}/{T_q} = 4/3$,  the transmitted signal  $s(t)$  is lower in frequency here than in uncoded transmission,

26 KB (4,161 words) - 16:01, 23 January 2023
Digital Signal Transmission/Applications for Multimedia Files
...irst 160 bytes of the file "LNTprofs.bmp". The file header (in hexadecimal representation from 0x00 to 0x0D) as well as the image data area (from 0x36) are highlight ...the hexadecimal representation and the trailing "d" indicates the decimal representation):

15 KB (2,365 words) - 13:54, 17 April 2023
Digital Signal Transmission/Consideration of Channel Distortion and Equalization
...espect to the signal component  $d_{\rm S}(t)$  of the detection signal if it is fully compensated with  $1/H_{\rm K}(f)$.  ...ponent  $d_{\rm S}(t)$  – originating from the transmitted signal  $s(t)$  – has exactly the same shape as calculated in the

20 KB (3,309 words) - 16:40, 28 June 2022
Modulation Methods/Error Probability of Direct-Sequence Spread Spectrum Modulation
..._Viterbi $\text{Andrew J. Viterbi}$].   In a somewhat simplified representation – without convolutional encoder,  interleaver and de-interleaver as *The spreading signal  $c(t)$  causes  "band spreading"  by the spreading fac

20 KB (3,049 words) - 18:30, 23 January 2023
Linear and Time Invariant Systems/Conclusions from the Allocation Theorem
...uo;'''impulse response'''«  $h(t)$  is equal to the output signal  $y(t)$  of the system if an infinitely short impulse with an inf ...ity condition  »the output signal cannot start before the input signal«  is:

18 KB (2,887 words) - 19:21, 15 November 2023
Mobile Communications/Characteristics of GSM
...also takes the channel coding into account.  In the case of a speech signal, for every  $20\ \rm kbit/s$  speech frame  $456$  bits ...demodulation of FSK)  we refer to two exercises in the book "Digital Signal Transmission":

17 KB (2,642 words) - 18:41, 20 February 2023
Linear and Time Invariant Systems/Properties of Coaxial Cables
'''Notes on the representation chosen here''' The time domain representation is obtained by applying the  [[Signal_Representation/Fourier_Transform

22 KB (3,399 words) - 19:37, 24 November 2023
Digital Signal Transmission/Basics of Coded Transmission
...ure.  In this process,  an adaptation of the digital transmitted signal to the characteristics of the transmission channel is achieved through the ...edundancy-free coding«  which leads to a non-binary transmitted signal,

28 KB (4,566 words) - 16:53, 23 March 2023
Digital Signal Transmission/Viterbi Receiver
...e$  of equidistant signal values after sampling has the best possible signal-to-noise power ratio  $\rm (SNR)$.<br> #This gives for the samples of the continuous decorrelation filter output signal  $d(t)$  at time  $\nu \cdot T$:   $d_{\nu} = a_{\nu}\c

31 KB (4,689 words) - 13:20, 13 July 2022
Mobile Communications/Distance Dependent Attenuation and Shading
#The  »distance-dependent attenuation of a radio signal«   and various  »path loss models«, In this representation, the radio signal reaches the mobile station via a direct path.

25 KB (4,083 words) - 15:23, 29 January 2023
Digital Signal Transmission/Error Probability with Intersymbol Interference
...ditions apply as for the last example.  The graph shows the detection signal  $d(t)$  after the Gaussian low-pass  $($before the decision [[File:Dig_T_3_2_S1c_version2_ret.png|right|frame|Detection signal with Gaussian receiver filter]]

27 KB (4,389 words) - 13:15, 10 October 2022
An e-learning project for Communications Engineering - LNTwww
...f>  link takes you to a list with a total of around  $640$  exercises and  $3100$  subtasks $($each with detailed sample solution$)$. ...courses with a total of thirty-six semester hours per week of lectures and exercises.

19 KB (2,918 words) - 14:56, 22 January 2024
Digital Signal Transmission/Optimization of Baseband Transmission Systems
|Untermenü=Digital Signal Transmission under Idealized Conditions ...el,  so that  $r(t) = s(t) + n(t)$  applies to the received signal.  The two-sided noise power density  $(N_0/2)$  is more suit

32 KB (5,279 words) - 15:51, 23 January 2023
Channel Coding/Code Description with State and Trellis Diagram
== Representation in the state transition diagram == ...d_Trellis_Diagram#State_definition_for_a_memory_register|$\text{sequential representation}$]]  in the previous section.

27 KB (4,131 words) - 18:10, 7 December 2022
Modulation Methods/Pulse Code Modulation
...n of non-ideal boundary conditions can be found in the book  "Digital Signal Transmission". ...e amplitude modulation«  $\rm (QAM)$  and more complicated signal space mappings,

44 KB (7,142 words) - 15:29, 23 January 2023
Modulation Methods/Non-Linear Digital Modulation
* in the first one an analog source signal  $q(t)$  is present,  and *in the second one a digital signal.

28 KB (4,482 words) - 16:21, 17 January 2023
Information Theory/Application to Digital Signal Transmission
==Information-theoretical model of digital signal transmission == The entropies defined so far in general terms are now applied to digital signal transmission, whereby we assume a discrete memoryless channel  $\rm (D

42 KB (6,429 words) - 16:10, 28 February 2023