Question

1.Choose ALL correct answers:

The benefits of smart antenna :(Group of answer choices)

(1)Improves LPI performance (low probability of interception) for base stations

(2)Reduces multiple access interference for base stations

(3)Increases battery life for a phone

(4)Increases transmission range for a phone

2.Choose ALL correct answers:

Diversity combining versus beamforming:(Group of answer
choices)

(1)In diversity, signals are highly uncorrelated to achieve good performance

(2)In beamforming, signals are correlated

(3)In diversity, signals are highly correlated to achieve good performance

(4)In beamforming, signals are uncorrelated

3.Choose ALL correct answers:

According to the spatial Nyquist sampling theorem, to avoid array
ambiguity, antenna spacing (inter-element spacing) should be:(Group
of answer choices)

(1)smaller than or equal to half the carrier wavelength

(2)smaller than or equal to twice the carrier wavelength

(3)large than or equal to half the carrier wavelength

(4)large than or equal to twice the carrier wavelength

4.Choose ALL correct answers:

Diversity combining techniques, :

(Group of answer choices)

(1)Selection diversity: Performs better than switched diversity

(2)Switched diversity: Requires only a single RF chain to serve all its antennas

(3)Maximal ratio combining: Performs better than equal gain combining

(4)Equal gain combining: Co-phased and weighted before combining

5.Choose ALL correct answers:

In beamforming, a beam pattern is dependent on:

(Group of answer choices)

(1)Carrier frequency

(2)Antenna weights

(3)Signal strength

(4)Signal phase

Answer #1

Answer)

**1) All options are correct**

1-> Smart Antenna Provides the directional beam therefore the LPI performance improve

2->Smart Antenna has higher gain it desired direction hence it reduces the chance of interference

3->Smart antenna provides larger coverage with higher gain therfore it is easy for phone not to search network everytime and hence battery life improves

4->Smart Antenna provides higher coverage with higher gain and directivity therefore transmission range of phone improves.

**2) option(1) and (2) are correct**

-> Diversity combinig technique is used to select the best recieved signal which arrived at reciever via different path, it means multipe copies of same signal arrive at reciever, out of which some of copies fades and some signals are strong but all are uncorrelated

-> Beamforming technique is used to increase the directivity and gain by combining the correlated signals

**3)option(1) is correct, smaller than or equal to half
the carrier wavelength**

spatial distance by nyquist criteria is given by

antenna spacing <= lambda/2

**4) All Options are correct**

1) Selection diversity-- selects the best signal (Highest SNR)from recieved signals from different braches whereas in switch diversity recieved signal from only from one branch.

2) Switch diversity-- use only one reciver chain to process further

3) Maximal ratio combining (MRC)-- recieve signals from all braches are optimally combined using weighing of each brach, magnitude scaling and cophasing . this provide maximum SNR for recieved signal. which is higher than Equal gain combining

4) Equal gain combining--signals are combined optimally using cophaing and weighing branch but with constant magnitude

**5) All options are correct**

In Beamforming The beam pattern depends on frequncy, phase ,weight and strenght

Choose
ALL correct statements about the
correlation coefficient.
Group of answer choices
It measures the extent to which two random variables move
together.
The values range between -∞ to +∞ .
A value of +1 implies that the returns for the two stocks move
together in a completely linear manner.
A value of 0 implies that the returns move in a completely
opposite direction.

Choose all correct statements.
1.The yield to maturity on a premium bond exceeds the bond's
coupon rate
2.The higher the yield to maturity, the lower the current price
of the bond.
3.All else equal, the current price of a bond increases when the
coupon rate decreases.
4.The regular interest payment of a bond is called the coupon
payment. Group of answer choices

1. The image distance s' for a flat mirror
Group of answer choices
a. Is always equal to s
b. Is always greater than s
c. Is always less than s
d. Can be greater than, equal to, or less than s
2. Choose all of the following that are true about
refraction
Group of answer choices
Refraction is the bending of light as it goes from one medium to
another
The incident angle and the refracted angle are measured...

Which of the following statements is
not correct?
Group of answer choices
The binomial option pricing model when taken to the limit
becomes the Black-Scholes option pricing model.
The Black-Scholes model uses a continuous time discount
factor.
The binomial option pricing model use a ratio of the range
values as the hedge ratio.
The Black-Scholes model is related to a heat transfer equation
and Brownian molecular motion.
The Black Scholes model only estimates the intrinsic value of
the call option....

Choose all that apply to the mammalian liver and its many
functions. Group of answer choices. 1.Detoxifies the blood by
removing and metabolizing poisonous substances 2.Produces plasma
proteins albumin and fibrinogen 3.Destroys old red blood cells
4.Produces Bile 5.Produces the digestive enzymes 6.Produces the
alkaline solution that aids in digestion in the small intestines
7.Aids in the mechanical aspects of digestion

choose the correct answer
1)
Which functional group is always found in alcohols?
phosphate
hydroxyl
2)
Ibuprofen, a drug used to relieve inflammation and pain, is a
mixture of two enantiomers; that is, molecules that ________.
Group of answer choices
differ in the arrangement of atoms around their double bonds
have identical chemical formulas but differ in the branching of
their carbon skeletons
are mirror images of each other
differ in the location of their double bonds
carbonyl
sulfhydryl
3)...

A. CHECK ALL THAT ARE CORRECT: The t-distribution is
Group of answer choices
flatter and more spread out than the normal distribution
closer to the normal distribution when df is very high
closer to the normal distribution when df is very low
more positively skewed than the normal distribution
B. In the context of a one-sample t-test, what is the
estimated standard error, sm, for a sample size of n = 4
with s2 = 16?
c. For a one...

Question 1)
Which of the following is a correct statement? Group of answer
choices
A) The A band of a sarcomere appears light in color when viewed
under a microscope
B) The tropomyosin protein contains 3 subunits: one that binds
to myosin, one that binds to actin and one that binds to ATP
C) During the power stroke of skeletal muscle contraction, ADP
and Pi are released as the hinge region of the myosin head
undergoes a conformational change, resulting...

1)what are the correct statements.
Group of answer choice:
a)If a security is underpriced, then the expected holding period
return is above the market capitalization rate.
b)The value of the equity equals the present value of all future
payouts (dividends plus repurchases).
c)The value of a share equals the present value of all future
dividends per share.
d)If a firm reinvests its earnings at an ROE equal to the market
capitalization rate, then its earnings-price (E/P) ratio is equal
to...

Which of the following statements on time lines is CORRECT?
Group of answer choices
1.Time lines cannot be constructed to deal with situations where
some of the cash flows occur annually but others occur
quarterly.
2.A time line is not meaningful unless all cash flows occur
annually.
3.Time lines are not useful for visualizing complex problems
prior to doing actual calculations.
4.Time lines can be constructed where some of the payments
constitute an annuity but others are unequal and thus...

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