Impact of diversity, Electrical Engineering

Assignment Help:

Both GSM and DECT use GMSK, but with different Gaussian filters (BGT = 0.3 in GSM, BGT = 0.5 in DECT). What are the advantages of having a larger bandwidth time product? Why is the lower ones used in GSM?

A system should transmit as high a data rate as possible within a 1-MHz bandwidth, where to use MSK or BPSK with root-raised cosine filters with α = 0.35? Note: this question concentrates on spectral efficiency, and avoids other considerations like the peak-to-average ratio of the signal.

Consider a point-to-point radio link between two highly directional antennas in a stationary environment. The antennas have antenna gains of 30 dB, distance attenuation is 150 dB, and the RX has a noise figure of 7 dB. The symbol rate is 20M symb/s and Nyquist signalling is used. It can be assumed that the radio link can be treated as an AWGN channel without fading. How much transmit power is required (disregarding power losses at TX and RX ends) for a maximum BER of 10-5.

(a) When using coherently detected BPSK, FSK, differentially detected BPSK, or noncoherently detected FSK. 

(b) Derive the exact bit and symbol error probability expressions for coherently detected Gray-coded QPSK. Start by showing that the QPSK signal can be viewed as two antipodal signals in quadrature.

(c) What is the required transmit power if Gray-coded QPSK is used?

(d) What is the penalty in increased BER for using differential detection of Gray- coded QPSK in (c)?


Related Discussions:- Impact of diversity

Illustrate signal attenuation, Q. Illustrate Signal attenuation? Signal...

Q. Illustrate Signal attenuation? Signal attenuation in many channels can be offset by using amplifiers to boost the signal level during transmission. However, the amplifier al

What is accelerator key, A keyboard shortcut for a command. For example, Ct...

A keyboard shortcut for a command. For example, Ctrl + Alt + Delete are an accelerator key for the task manager in Windows 95.

Determine line voltage for the y- connected machine, A 3-phase, 16-pole syn...

A 3-phase, 16-pole synchronous machine is driven by a prime mover at a speed of 600-rpm with the stator open circuited. The rotor flux per pole is 0.025-Wb. Determine (a) the fr

Sketch voltage and the energy stored in the capacitor, Q. Considering the c...

Q. Considering the circuit shown in Figure, sketch v(t) and the energy stored in the capacitor as a function of time.

Machine, function of a commutator in a DC motor

function of a commutator in a DC motor

Functions of the physical layer in the internet model, (a) Describe the f...

(a) Describe the four functions of the physical layer in the Internet Model. (b) (i) With the help of a diagram describe the main stages involved in the digitization of a

Transistor Amplifier, I need help designing a BJT amplifier with that meets...

I need help designing a BJT amplifier with that meets the following parameters: voltage gain greater than 300, Ic(Vce=0)=2uA, Vcc=20V.

ECE, a problem solving problem

a problem solving problem

Elementary induction machines, Elementary Induction Machines In the dis...

Elementary Induction Machines In the discussion that followed Equation, the third possiblemethod of producing constant torque was to cause the mmf axes of stator and rotor to r

Common-emitter configuration, Common-emitter configuration: The commo...

Common-emitter configuration: The common-emitter that is abbreviated as CE transistor configuration is displayed in figure.  The transistor terminal common to both the input

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd