Need a solution It is required to design a celluar system to cover an area of 157 km2. If the radius of a mobile cellularsystem hexagon cell is 1.2km is located in area of exponent loss y = 2. Calculate:a. The no. of cells needed to cover the targeted areab. The distance between adjacent cellsC. The minimum distance between co-channelsd. The cluster size required to produce C, -18 dB.

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Answered: It is required to design a celluar…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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6-1. You are designing an FDM-PCM/FDMA analog link that will occupy 36 MHz of an INTELSAT VI transponder with 10 users of equal bandwidth. The uplink and downlink center frequencies of the occupied band are 5985.5 MHz and 3760.5 MHz. The distance from the satellite to your earth station is 40,000 km. The saturation uplink flux density (total - all carriers) for your uplink is - 75 dBW/m2 and the satellite's G/T is = -11.6 dB/K. At saturation, the transponder EIRP for your downlink is 29 dBW and the earth station's G/T is 41 dB/K. Assume that the transponder is linear (an unrealistic scenario - but do it this way such that BOI = BOo, dB. The intermodulation carrier to noise ratio, (C/N), in dB, is related to the back-off BOo in dB by (C/N)31M = 7.86 - 0.714 * BO0 In other words, at Xponder saturation the value of (C/N)31M = 7.86 dB and for example BOo = -6 dB the (C/N)31M = 7.86 0.714*(-6) = 12.14 dB. (a) Find the maximum overall carrier-to-noise ratio (C/N), in dB that this link can…
Ans. (10 W 3.4.3 A 15 km optical fiber link uses fiber with a loss of 1.5 dB km '. The fiber is jointed every kilometer with connectors which give an attenuation of 0.8 dB cach. Determine the minimum mean optical power which must be launched into the fiber in order to maintain a mean optical power level of 0.3 pw at the detector. Ans. (703 uW)
Consider a cellular system with hexagonal cells of radius R=1 Km. Suppose the minimum distance between cell centres using the same frequency must be D = 6 Km to maintain the required SINR. a. If the total number of available channels is 1800, find the number of channels that can be assigned to each cel b. Discuss two techniques to enhance cell coverage in cellular systems c. Explain the importance of link budget in the planning of cellular systems. (
Q: For the common emitter-bias network, determine the following: (Rp. RE. Re. Vec) if r, = 5.342, Z 118.37 KO, Z, = 2.2 KO, B = 140 and %3D %3D Ay=-1.81.
Figure 3 (b) is the Miller equivalent circuit of Figure 3 (a). Derive a relationship between the capacitances C, C: and C and state the main hypothesis for the valıdity of the theorem. Figure 3 (a) Figure 3 (b) (b) The open loop gain A,, for a circuit is given by: AOL-8 * JAR (C, +G1-erLR CC,) Calculate the resonant frequency fi and the gain Aot at Explain wha. you use and show the details of the calculation. (e) If C=Cy= IpF, g2.2 mS and R,5 k2, can you conclude that the circuit would oscillate if the feedback loop were closed Justify your conclusion, 1 Figure 4 (a) and Figure 4 (b) show two current mirrors based on MOSFETS Ma Ms Figure 4 (a) Figure 4 (b) (a) Derive a formula relating the input current I, to the output current I for the current mirror of Figure 4 (a) stating any assumptions. (b) Draw the small-signal equivalent circuit for the current mirror of Figure 4 (a) and determine the output resistance R Derive a formula relating I and L for the circuit of Figure 4 (b) assuming…
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Modify this circuit to extend the upper frequency limit to greater than 15 MHz. You may change the topology (i.e. configuration), but not the power supply voltage or collector bias current. The circuit voltage gain must be 46dB +/- 1 dB. Provide simulation results to show AC frequency responses of both circuits on the same plot, and annotate the 3dB upper frequency limit on both traces. Use typical ẞ values from the data sheet for the simulation. You may assume that 1% resistors are available in values below 100. The circuit must adhere to Standard Bias techniques. V4 Rser=0 SINE(0 0.02 10k) AC 1 VCC ୯ V2 +15V Cin1 1μ -VCC VCC R4 Rc1 147k 7k Q3 2N3904 R7 R6 9.09 20.5k Ce1 Re1 1.00k 10p Out
compute for the following
A 10 MHz TXCO is driving a receiver’s front end and has a frequency deviation of 4 ppm. It drives a direct down conversion RF front-end mixing the L2 frequency. What is the frequency offset at baseband due to the TXCO?
6. For an FM modulator with modulation index m = 2, modulating signal v, (t) = Vm sin (2x2000t), and an unmodulated carrier v.(t)=8 sin(27800000r), a. Determine the number of sets of significant sidebands. 2 b. Determine their amplitudes. c. Draw the frequency spectrum showing the relative amplitudes of the side frequencies. It is given that Bessel coefficient corresponding to carrier component J(2) equals 0.22. Moreover, a side frequency is not considered significant unless it has amplitude equal to or greater than 1 % of the unmodulated carrier amplitude. Abbreviations: QPSK: Quaternary Phase Shift Keying BPSK: Binary Phase Shift Keying LED: Light Emitting Diode AM: Amplitude Modulation FM: Frequency Modulation
4. A clock signal is routed on the top metal layer using a wire that is 2 µm wide and has a self-heating limit of 20 mA. The wire has a capacitance of 0.6 fF/μµm and the load capacitance is 115 fF. The clock switches at 1 GHz and has a 10 ps rise time. How far can the wire run between repeaters without overheating? Assume, VDD = 3V. 5. For a certain sequential logic circuit, a 25 MHz clock signal is used. For the timing parameters given below, compute the maximum time that can be borrowed for 2-Phased Latches and Pulsed Latches sequencing methods. Given, tsetup = 12 ns, tnonoverlap = 7 ns, tpw = 30 ns.
A spectrum analyzer with an input impedance of 200 is used to measure the power spectrum of an AM signal at the output of a preamplifier circuit. The AM signal has been modulated with a sine wave. The effective carrier power, Pc, is 750mw, and each sideband, PusB and PLSB, is 120mW. Compute the following: 1- The total effective power Pr. 2- The peak carrier voltage, Vc- 3- The modulation index, m, and the percent modulation index. 4- The modulation voltage,Vm. 5- The lower -and upper - sideband voltages, VLSB and VUB. 6- Sketch the waveform that you would you see with an oscilloscope if it were placed in parallel with the spectrum analyzer.

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