tao = 1:10;
T=2;
td=4;
ctao =
heaviside(tao-td)+0.5.*heaviside(tao-(td+T))+0.5.*heaviside(tao-(td-T));
figure(1);
plot(tao,ctao);
power = abs(ctao.^2./tao);
pdelay_dBm= 20*log10(power/10^-3);
figure(2);
stem(tao,pdelay_dBm)
rms = var(power);
ft=fft(ctao);
ft=ft(1:len(ctao)/2+1);
mag = abs(ft);
phase= angle(ft);
figure(3);
subplot(211);
plot(mag);
subplot(212);
plot(phase);
Problem 1: Consider the following time-invariant channel impulse response td and T are constants....
Problem 1: Consider the followingtime-invariant channel impulse response c(t)-6(t-td) + (1/2) δ(t-(t0+T)) + (1/2) δ(t(td-T)), td and Tare constants. a Plot this impulse response and show the delay of each path. b- Find the power delay profile for this given channel c Find the rms delay spread by using the power delay profile you find in (b) d- Find the coherence bandwidth°fthis channel (assume 90% correlation). Note that it may be a function oftd and e Find the frequency response...
Problem 2.13 A wireless channel has impulse response given by h(t) 2t 0.1) +j8(t 0.64)-0.86(t-2.2), where the unit of time is in microseconds (a) What is the delay spread and coherence bandwidth? (b) Plot the magnitude and phase of the channel transfer function H(f) over the interval -2Be,2Be], where Be denotes the coherence bandwidth computed in (a). Comment on how the phase behaves when H(f) is small. (c) Express | H(f)l in dB, taking 0 dB as the gain of...
below is a direct sequence code division multiple access Q1 A LTE system employs orthogonal frequency division multiple30 access (OFDMA) transmission for downlink transmission, in which users are allocated a specific number of subcarriers for a predetermined amount of time, referred to as physical resource blocks (PRBs) in the LTE specifications. A PRB is defined as consisting of 12 consecutive subcarriers for one slot in duration. Given that the subcarrier spacing is 15 KHz, and transmission bandwidth over a 2.7GHz...
Qodopere -Model -Dodst C Be) o 5 10 (Ms) microsecond a) For the wireless channel whose power-delay profile is given in Figure, calculate RMS delay spread or ? b) Estimate the coherence bandwidths for 90% correlation and 50% correlation? CHint: Beach for 90% , B= for %) © For the following scenarios, determine if the received signal is best described as undergoing fast fading, flat fading or frequency selective fading ? a) A binary modulation has a data rate of...
3. (20 points) The local spatial average of a power delay profile is shown in the following figure. We assume that the coherence bandwidth is approximated by B and the coherence time is estimated using the popular rule of thumb for modern digital communications. Pr(r) -10 dBm -20 dBm -30 dBm 0 5 10 excess delay r rs) If a baseband message with a bit rate R, 400 kbps is modulated by an RF carrier frequency of 5.8 GHz and...
The local spatial average of a power delay profile is shown in the following figure. We assume that the coherence bandwidth is approximated by B and the coherence time is estimated using the popular rule of thumb for modern digital communications. 5? P(z) (dBm) -10 -20 -30 0 25 50 125 ?(ns ) If a baseband message with a bit rate R, 400 kbps is modulated by an RF carrier frequency of 5.8 GHz and the mobile is traveling at...
The impulse response h(t) of a linear time-invariant system is 2*pi[(t-2)/2]. Find and plot the output when the system is driven by an input signal that is identical to the impulse response.
Determine the RMS(root mean square) delay spread. 30 Q1 A LTE system employs orthogonal frequency division multiple access (OFDMA) transmission for downlink transmission, in which users are allocated a specific number of subcarriers for a predetermined amount of time, referred to as physical resource blocks (PRBs) in the LTE specifications. A PRB is defined as consisting of 12 consecutive subcarriers for one slot in duration. Given that the subcarrier spacing is 15 KHz, and transmission bandwidth over a 2.7GHz carrier...
Problem 4. Linear Time-Invariant System.s A linear system has the block diagram y(t) z(t) →| Delay by 1 dt *h(t) where g(t) sinc(t Since this is a linear time invariant system, we can represent it as a convolution with a single impulse response h(t) a) Find the impulse response h(t). You don't need to explicitly differentiate. b) Find the frequency response H(j for this system.
Q2 Fig.2 is a simplified diagram of a WCDMA system downlink signalling 20 construction, in which different channelization code CensF are used to PAPER CODE: EEE326/17-18/S2/ exam Page 2 of 6 separate different physical channels in downlink whilst the scrambling code Sa is used to differentiate the BSs. Each physical channel is assigned to different user with a gain factor Gi. Assume QPSK modulation is employed for digital transmission and the spectrum is 3.84 MHz. One user has a data...