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What are the advantages and disadvantage of pulse position modulation?
advantage-its a base for all the digital modulation technique disadvantage- 1.since amplitude keeps varying so there is noise associated with it. 2.due to nyquist criteria its require high bandwidth. 3.due to amplitude variation peek power of receiver also varies with it nitesh
What is 200KQ7W emission?
200KQ7W is the emission bandwidth of GSM 900/1800 network. 200K - 200KHz bandwidth Q - The carrier is angle-modulated during the period of the pulse 7 - Two or more channels containing quantized or digital information. W - Information to be transmitted- telegraphy, facsimile,telemetry, data transmission, telephony and television(video)
What are the types of pulse modulation?
Pulse width mod, pulse amplitude mod, pulse position mod, pulse code mod.
How do you calculate spectral efficiency?
1.Find the Fourier Transform of the pulse used to transmit data over the channel. 2.Determine the bitrate of the signal by the modulation format (QPSK for example has 2bits/symbol so 1 symbol per second would equate to 2 bits/s) 3.The first null in the Fourier transform is the required bandwidth (~0.75 x bitrate in optical communications, depends on channel) 4. Divide bits/s by the required bandwidth to find the spectral efficiency.
What is triggered pulse in electronics?
A: It is a pulse of any duration designed to trigger an event i logic design
Smaller the pulse width larger is the bandwidth How?
For the Radar Case: The bandwidth of the pulse is the reciprocal of the Pulse Duration (called Pulse Width) as any filtering needs to be able to detection and follow the pulse shape and its edges. The pulse width is the AM modulation to a Fixed Frequency Carrier Frequency and the AM modulation will be greater bandwidth then the Carrier Frequency. As you are attempting to reject receiving other emissions and noise that do not match your own emissions such that your receiver is "match filtered" to your emissions, your receiver bandwidth will be at least the reciprocal of the pulse width but is lightly to be a smaller bandwidth then the reciprocal of the pulse width.
What is increased if pulse duration is decreased?
bandwidth
What is the bandwidth of pulse position modulation?
probably (the carrier frequency +- the maximum frequency of the pulse train)/(the carrier frequency) but pulses have a lot of harmonics
Which medication requires a pulse check?
Digoxin
A pulse reaches the boundary of a medium in which the speed of the pulse becomes higher. Is the reflection of the pulse the same as for the incident pulse or is it inverted?
same
What is the effect of increasing the bits per second in pulse code modulation?
when the bit rate increases bandwidth increases.
Why rectangular pulse cannot be sent in ssb modulation?
In theory it can but requires infinite bandwidth. A square wave (or pulse) is a combination of the fundamental frequency and the odd harmonics. If you send a square wave of 1kHz, you need to also be able to send 3kHz, 5kHz, 7kHz, 11kHz ....... etc. Since the bandwidth allowed for most SSB transmissions only allow up to 3kHz bandwidth, all you get is the fundamental of a 1kHz sin wave. On the other hand, if you send a 200Hz tone you can send 200Hz, 600Hz, 1kHz, 1.4Hz, 1.8Hz, 2.2kHz 2.6kHz and this combination will look a lot more like the original 200Hz square wave tone.
What is staggered PRI?
Background: PRI = Pulse Rate Interval. PRI is a term used in Radio Frequency (RF) systems. Specifically, Pulse mode RF systems, as apposed to continuous wave (CW) systems. Each pulse has an on period, pulse width (PW), and an off period. PRI is the time from the start of one pulse to the start of the next pulse. For example, if a pulse on time is 10 microseconds (uSec) and the off time is 90 uSec then the PRI is 100 uSec. Answer: A staggered PRI does not have a constant on and off time. The off time varies.
Which vicitim requires CPR?
a victim who is unresponsive with no normal breading and no pulse
Would the pulse rate be higher or lower after running for 10 minutes?
Higher.
What is the relationship between activity and pluse rate?
The higher level of an activity means the higher level pulse rate. For example running will produce a higher pulse rate than walking would.
Why are apical pulse usually taken on infants and children?
because infants have higher average pulse rates.
