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Please design a modem to transmit in a passband channel from 0 Hz to 3 KHz. The targeting bandwidth efficiency is 4 bits/sec/Hz. Please find the appropriate modulation, symbol rate, bit rate, raised-cosine roll-off factor, and carrier frequency?
Ron don
Given the constraints of the passband channel, the most appropriate modulation scheme to use would be Quadrature Amplitude Modulation (QAM). This modulation scheme is capable of achieving high data throughput, which is necessary for the targeted bandwidth efficiency of 4 bits/sec/Hz.
The symbol rate (SR) should be chosen so that it is within the given passband channel, while also allowing for a high enough bit rate to reach the targeted efficiency. To do this, the SR should be chosen to be in the range of 1Khz to 3Khz, depending on the specific requirements of the system.
The bit rate (BR) should be chosen based on the symbol rate and the targeted bandwidth efficiency. For a given symbol rate, the bit rate can be calculated by multiplying the symbol rate by the number of bits per symbol. For example, if the symbol rate is 1Khz, then the bit rate can be calculated as 1Khz x 4 bits/symbol = 4Kbps.
The raised-cosine roll-off factor should be chosen based on the specific requirements of the system. Generally, a roll-off factor of 0.25 is a good choice and will provide good performance.
The carrier frequency should be chosen based on the specific requirements of the system. Generally, a carrier frequency in the range of 1Khz to 3Khz is a good choice.
David Denton
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Which cellular system uses the most bandwidth efficient modulation?
I think it is Frequency Modulation with Phase modulation which it the most bandwidth efficient
Which analog modulation scheme requires minimum transmitted power and minimum channel bandwidth?
ssb modulation scheme
Which modulation scheme requires the least minimum bandwidth?
Suppressed carrier single sideband amplitude modulation - SCSSBAM.
Why do you use sigma delta modulation instead of adaptive delta modulation?
if we need simple transmitter and receiver, if we need low bandwidth
What are the contrast of amplitude modulation to frequency modulation?
AM (Amplitude Modulation) has a smaller bandwidth and can have more stations available in any frequency range. AM is cheaper and can be transmitted over long distances. FM (Frequency Modulation) signals are prone to interference due to physical obstructions. The better sound quality is due to a much higher bandwidth, using FM.
What is the channel bandwidth for 2KHZ signal?
depends on type of modulation and other variables
Conclusion about amplitude modulation?
A carrier is used to make the wavelength smaller for practical transmission and to permit multiplexing. The spectrum is used to measure bandwidth (the range of frequencies) and the efficiency (the power in the side-bands compared to the total power) Bandwidth can be predicted using BW = 2 fm where fm = the maximum modulating frequency Efficiency depends only on the modulating index, m (the fraction of the carrier you modulate by) AM is limited to 33% efficiency because the modulation index cannot be increased to > 1.0 without introducing distortion in the receiver.
What determines the data rate that a modem can support?
The bandwidth of the transmission media The modulation encoding used
The relationship of the bandwidth required for double-sideband emitted carrier AM to the bandwidth of the modulating signal of?
In Amplitude Modulation (AM), specifically in the case of Double Sideband Suppressed Carrier (DSB-SC) or Full Carrier (DSB-FC) AM, the required bandwidth is twice the bandwidth of the modulating signal. If the modulating signal has a bandwidth of B Hz, the bandwidth required for AM would be 2B Hz. This is because both the upper and lower sidebands of the carrier wave are utilized in the modulation process, each consuming bandwidth equivalent to the original signal.
What the difference between the single carrier and the multi-carrier modulation?
Multi-carrier modulation (MCM) is a method of transmitting data by splitting it into several components, and sending each of these components over separate carrier signals. The individual carriers have narrow bandwidth , but the composite signal can have broad bandwidth.
What are Advantages of delta modulation?
The delta modulation transmits only one bit for one sample. Thus the signaling rate and transmission channel bandwidth is quite small for delta modulation. The transmitter and receiver implementation is very much simple for delta modulation. There is no analog to digital converter involved in delta modulation. The disadvantages of delta modulation are slope overload distortion and granular noise. These are the two drawbacks of delta modulation.
What is the effect of increasing the bits per second in pulse code modulation?
when the bit rate increases bandwidth increases.
