HW 2-1 Fading
Let wI be the power received by the mobile at distance "I" from the base station. The
probability distribution of the power at distance "I" is p(wI)=exp(-wI/mI )/mI where mI is
the mean.
Chapter 1
1. In case of an accident, there is a high chance of getting lost. The transportation cost is very high each
time. However, if the infrastructure is set once, it will be very easy to use it
Last Name_First Name_ID_
The carrier frequency of IS-95 system (also known as CDMAone) is 830
MHz, and slot length is 20 ms, whats the corresponding Doppler spread to a
car at speed 50 km per hour? Is
Transmission Impairments
I-Tai Lu
Department of ECE
Polytechnic Institute of NYU
1
Contents
1. Geometric Spreading Effects
2. Multipath Effects
2.1. Frequency Selectivity
2.2. Space Selectivity
3. Dop
Fundamentals of Power Electronics
Second edition Robert W. Erickson Dragan Maksimovic University of Colorado, Boulder
Fundamentals of Power Electronics
1
Chapter 1: Introduction
Chapter 1: Introductio
Chapter 3. Steady-State Equivalent Circuit Modeling, Losses, and Efficiency
3.1. The dc transformer model 3.2. Inclusion of inductor copper loss 3.3. Construction of equivalent circuit model 3.4. How
National Air Express:
National Air is a competitive air- express firm with offices around the country. Frank Smith, the
Chattanooga, Tennessee, station man-ager, is preparing his quarterly budget repo
Ans1. The situation and its challenges in the fall of 1989 are as follows:1. Product/Market: The portable is at least 2 years late and severely overweight and oversized. Apple
seems to have missed the
Name_ID_ (10pts)
A typical application example is given here. A radio transmitter with power 10mW and
frequency 900 MHZ is employed in a microcell. The background noise is -120dBm. The
height of mobil
Multipath and Doppler Effects and Models
(A Deterministic Approach to Broadband Channel Modeling)
There are two parts in this lecture.
In Part I, we will first introduce the mutipath propagation effe
HW 1 sol
1)
Consider one-dimensional cellular FDMA system serving a highway and making use of
NR cells per frequency reuse region. See two examples (NR=2 and NR=3) below.
2r
Cell 1
Use f1
Cell 2
Use f
HW 3-1. Multipah channel models
A transmitter transmits a signal s(t) with carrier frequency fc. The signal reaches the
receiving antennas through three paths. The path gains are a1, a2, and a3. The p
HW 3b-1 Delay Spread
There are two rays with arrival times at 10sec and 11sec. Find the power weighted
mean arrival time and power weighted delay spread (i.e., rms delay spread) for the
following two
HW 2-1 Path Loss Model
a.) A path loss model is given by the following equation
PL(d)= - nm 10*log10 (d/dm)+PL(dm), m=1,2,3,
dm <d<dm+1
Find the slopes nm and break points dm, m=1,2,3 from the followi
MMSE DATA DETECTION (Transmitter Processing with Total Power Constraint)
Basic MMSE Problem:
Consider the following problem. We receive a vector y of the form
y =Hx + n
(1)
where H is the known channe
Last Name_First Name_
Received signal R is the sum of a bipolar signal S and an additive Random Noise N.
Here, the bipolar signal constellation for S is
either +1 (with probability p)
or 1 (with proba
Name_
The power delay profile for channel model A is
1 - 0.2t
P (t ) =
0
0 t 5( m sec)
elsewhere
And the Doppler Power spectrum is S()
If the system bandwidth is 1MHz,
a.)
b.)
c.)
d.)
What is the mi
Let wI be the power received by the mobile at distance I from the base station. The probability
distribution of the power at distance I is
p(wI )=1/m I
if 0.5m I >= wI >= 1.5m I
Assume mI is proportio
Part I
The power of two received signals r1 and r2 are non-negative random variables. When the
system threshold is 1, the outage probability of one branch (i.e., no diversity) is 0.05.
That is
Prob( r
De Mars Product Strategy
De Mar, a plumbing, heating, and air-conditioning company located in Fresno, California, has a
simple but powerful product strategy:
Solve the customers problem no matter what