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What techniques can be used for mitigating the effects of frequency-selective fading? What techniques can he used for mitigating the effects of fast fading".
If there is no motion between a transmitter and receiver, how large would the inter-leaver span need to be in order to provide any time-diversity benefits?
What is the relationship between the spaced-frequency correlation function, as measured by the coherence bandwidth A, and the spaced-time.
Consider an indoor narrowband mobile communication system that is characterized by a power density profile made up of four impulse functions.
Consider a mobile wireless system, using QPSK modulation at 24.3 ksymbols/s, and a carrier frequency of 1900 MHz.
For an inter leaver to provide meaningful time diversity, a rule of thumb requires that the span of the inter leaver, TIL.
A transmitted signal having a bandwidth of 5 kHz. and propagating over a channel having a coherence bandwidth of 50 kHz.
Consider a TDMA mobile wireless system, having a carrier frequency of 1900 MHz. that operates on a high-speed train at a speed of 180 km/hr.
In the late 1980's in Japan, a digital portable telephone system. called the Portable Handy phone System (PHS) was specified.
An inter leaver span should be at least 10 times greater than the channel coherence time in order to provide significant time diversity for a mobile wireless.
What is the largest ratio of inter leaver span to channel coherence time. Tuff°. that can be used, for the following cases?
A mobile wireless system is configured to support a data rate of 200 kbits/s using QPSK modulation and a carrier frequency of 1900 MHz.
For a mobile wireless application, a phase-based modulation scheme is particularly susceptible to phase distortion.
Consider a mobile communication system which has a framing and time-slot arrangement as shown below in Figure.
Consider a mobile wireless orthogonal FDM (OFDM) system that is intended to operate in a vehicle with speeds up to 80 km/hr in an urban environment.
A mobile wireless system uses direct-sequence spread-spectrum (DS/SS) signaling to mitigate the effects of a received signal.
Given a mobile wireless system with a carrier frequency of f. = 900 MHz, and a Doppler frequency of ft = 50 Hz.
Consider a channel whose power-density profile is made up of three impulse functions with relative power and time-delay locations.
A signal within a mobile wireless system undergoes time spreading. The symbol rate = 20 k symbols/sec.
In Figures below, P-boxes and S-boxes alternate. Is this arrangement any more secure than if all the P-boxes were first grouped together.
What is the output of the first iteration of the DES algorithm when the plaintest and the key arc each made up of zero sequences?
Consider the 10-bit plaintext sequence 0 1 0 1 1 0 1 0 0 1 and its corresponding cipher text sequence 0 1 1 1 0 1 1 0 1 O.
If the prime numbers are p = 7 and q = 11. list five allowable values for the decryption key, d.
Find the nonsuper-increasing vector to be made public. and encrypt the data vector 1 1 0 1 1.
The session key in hex notation is = 0002 0003 0002 0003 0002 0003 0002 0003, where the rightmost 4-digit group represents the sub key Z1.