A clever system designer claims that the
depicted
transmitter has, despite its complexity,
advantages over the usual amplitude modulation system.The message signal
is bandlimited to
Hz, and
the carrier frequency
. The channel attenuates the transmitted signal
and adds white noise of spectral height
.
The transfer function
is given by
Find an expression for the spectrum of
.
Sketch your answer.
Show that the usual coherent receiver
demodulates this signal.
Find the signal-to-noise ratio that results
when this receiver is used.
Find a superior receiver (one that yields a
better signal-to-noise ratio), and analyze itsperformance.
Multi-tone digital communication
In a so-called multi-tone system, several bits are
gathered together and transmitted simultaneously ondifferent carrier frequencies during a
second interval. For
example,
bits would be
transmitted according to
Here,
is the frequency offset for each bit and it is
harmonically related to the bit interval
. The value of
is either
or
.
Find a receiver for this transmission scheme.
An ELEC 241 almuni likes digital systems so much
that he decides to produce a discrete-time version. Hesamples the received signal (sampling interval
). How should
be related to
, the number of
simultaneously transmitted bits?
The alumni wants to find a simple form for the
receiver so that his software implementation runs as
efficiently as possible. How
would you recommend he implement thereceiver?
City radio channels
In addition to additive white noise, metropolitan
cellular radio channels also contain multipath: theattenuated signal and a delayed, further attenuated
signal are received superimposed. As shown in
[link] , multipath occurs
because the buildings reflect the signal and thereflected path length between transmitter and receiver
is longer than the direct path.
Assume that the length of the direct path is
meters and the
reflected path is 1.5 times as long. What is themodel for the channel, including the multipath and the
additive noise?
Assume
is 1 km.
Find and sketch the magnitude of the transfer functionfor the multipath component of the channel. How would
you characterize this transfer function?
Would the multipath affect AM radio? If not, why
not; if so, how so? Would analog cellular telephone,which operates at much higher carrier frequencies (800
MHz vs. 1 MHz for radio), be affected or not? Analogcellular telephone uses amplitude modulation to
transmit voice.
How would the usual AM receiver be modified tominimize multipath effects? Express your modified
receiver as a block diagram.
Downlink signal sets
In digital cellular telephone systems, the base station
(transmitter) needs to relay different voice signals toseveral telephones at the same time. Rather than send
signals at different frequencies, a clever Rice engineersuggests using a different signal set for each data
stream. For example, for two simultaneous data streams,she suggests BPSK signal sets that have the
depicted basic
signals .
Questions & Answers
differentiate between demand and supply
giving examples
In economics, a perfect market refers to a theoretical construct where all participants have perfect information, goods are homogenous, there are no barriers to entry or exit, and prices are determined solely by supply and demand. It's an idealized model used for analysis,
When MP₁ becomes negative, TP start to decline.
Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 •
Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of lab
Kelo
Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 •
Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of labour (APL) and marginal product of labour (MPL)
Quantity demanded refers to the specific amount of a good or service that consumers are willing and able to purchase at a give price and within a specific time period. Demand, on the other hand, is a broader concept that encompasses the entire relationship between price and quantity demanded
Ezea
ok
Shukri
how do you save a country economic situation when it's falling apart
Economic growth as an increase in the production and consumption of goods and services within an economy.but
Economic development as a broader concept that encompasses not only economic growth but also social & human well being.
Shukri
production function means
Jabir
What do you think is more important to focus on when considering inequality ?
sir...I just want to ask one question... Define the term contract curve? if you are free please help me to find this answer 🙏
Asui
it is a curve that we get after connecting the pareto optimal combinations of two consumers after their mutually beneficial trade offs
Awais
thank you so much 👍 sir
Asui
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities, where neither p
Cornelius
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities,
Cornelius
Suppose a consumer consuming two commodities X and Y has
The following utility function u=X0.4 Y0.6. If the price of the X and Y are 2 and 3 respectively and income Constraint is birr 50.
A,Calculate quantities of x and y which maximize utility.
B,Calculate value of Lagrange multiplier.
C,Calculate quantities of X and Y consumed with a given price.
D,alculate optimum level of output .
the market for lemon has 10 potential consumers, each having an individual demand curve p=101-10Qi, where p is price in dollar's per cup and Qi is the number of cups demanded per week by the i th consumer.Find the market demand curve using algebra. Draw an individual demand curve and the market dema
suppose the production function is given by ( L, K)=L¼K¾.assuming capital is fixed find APL and MPL. consider the following short run production function:Q=6L²-0.4L³ a) find the value of L that maximizes output b)find the value of L that maximizes marginal product