What can increase the power of the transmitted signal reduce in the baseband transmission system?

Whether it is wifi or cellular, they are de facto duplex networks, information cannot always be transmitted in one direction, and the control signals (signaling) are mutual.

Therefore, there will only be one scenario at most where the amount of data received is greater than the amount of data sent.

So: 1, if it is the power transmitted from the antenna, then both sides need a considerable peak power, the power from the base station can be higher, but the signal of the client equipment must be at least strong enough to be received by the base station, otherwise how to establish communication?

2. If it is said that the PA (power amplifier) connected at the other end of the antenna feeder, the general base station will be adjusted more at this time, because the base station wants to communicate with the equipment within the entire cell, and a base station may have multiple cells, and the base station needs to work in each time slot channel; Conversely, the client device generally only needs to communicate with one base station (LTE can be multiple), and it only needs to send and receive information on its own time slot channel.

If the medium and large hair has good power, reducing the transmission system should be equivalent to reducing the signal power, so the system transmission capacity will become larger.

The received signal is almost between 70 and 100dbm, which is as weak as you can imagine, so you should tell if the radiation from your phone affects your health or not.

The signal is received by the antenna impedance matching, and then amplified and filtered into the IF chip to demodulate into an analog baseband signal, which is sent to the baseband, and after the analog-to-digital conversion, it is a digital signal, but the power is still only how much negative dBm

the ratio of signal power to noise power; Band utilization is the transmission rate of symbols in a unit frequency band; The bit error rate refers to the probability that a symbol is incorrectly transmitted in the transmission system, that is, the number of error symbols is in the total transmission symbol.

Occupied bandwidth aImprove signal-to-noise ratio bIncrease the transmission bandwidth c

Increase the signal power dReducing Noise Power If we know that the symbol rate of an octal signal is 4800 baud, then its corresponding information rate is 2400 bits s 9600 bits s 48

This is not only to increase the power to decrease, but also to increase some other aspects.

It is still difficult to reduce the simplification of the power generated by increasing the generation signal.

Increasing the number of signals sent can be reduced. Or what is the input system with the ship, you can check it on the Internet, and then ask you what is going on after the after-sales service.

Increasing the power of the transmitted signal can reduce the signal loss in the baseband transmission system. In this way, the strength of the signal can be enhanced.

The question you are asking is really professional and really can't tell you.

The power of the real transmission signal can reduce the speed of the baseband transmission system, so you can go to this to judge his specific situation.

If you increase the transmission signal power, you can reduce the speed of the baseband transmission system, so you can use this and go. Judge the specific changes in it.

Summary. For a single-user channel with only one source and one host, it is a number, the unit is bits or bits per symbol, it represents the maximum amount of information that can be transmitted per second or per channel symbol, or the information rate less than this number must be transmitted without errors in this channel, for multi-user channels, when both the source and the destination are two, it is a closed on the plane.

In baseband communication, what is the maximum data transfer rate allowed by the channel.

Channel capacity. The maximum rate at which a channel can transmit error-free.

For a single-user channel with only one source and one host, it is a number, the unit is bits or bits per symbol, it represents the maximum amount of information that can be transmitted per second or per channel symbol, or the information rate less than this number must be transmitted without errors in this channel, for multi-user channels, when both the source and the destination are two, it is a closed on the plane.

In a digital baseband signal transmission system, the transmit filter can play the role of ().

a.Filter out channel out-of-band noise.

b.Pattern transformation of the input transmission code.

c.The frequency band in which the input signal is compressed.

d.Converts the waveform of the transmission code entered by Kiri.

e.Generate bit-timed synchronization pulses.

Correct Answer: Perform a pattern transformation on the input transmission code; The frequency band of the input signal is reduced by the pressure wheel.; Converts the waveform of the input transmission code.

It's all original, non-**, and I've been writing it for a long time

In fact, Ethernet is not all baseband transmission, and there are also specifications for frequency band transmission, such as the 100broad-f standard, but it is rare.

Different from wireless transmission, which is limited by antenna size and space transmission characteristics and must modulate the signal to the frequency band, the baseband transmission performance of copper cables is relatively good, so the baseband transmission can make better use of bandwidth, and the hardware implementation cost is far lower than that of frequency band transmission.

Far from it, the base in our commonly used 10base-t and 100base-tx represents the "baseband", the information you mentioned on the Internet is too old, and the best counterexample is optical communication! The same baseband signal, but can reach 10Gbps or even 40Gbps rate, of course, copper cable can not reach such a high rate, but through optimization, 1000Mbps can be barely reached (why reluctantly, look at the strict requirements of 1000base-tx for the cable and the upper limit of the transmission distance), so it proves that no one has stipulated that the frequency band of the baseband signal is very narrow!

The reason why the bandwidth of copper cables (twisted pairs) is less than that of fiber is due to the following contradiction:

1. The larger the diameter of the copper cable, the lower the cut-off frequency, so the higher the signal frequency, the smaller the required cable diameter;

2. Copper cables have a skin effect, that is, at high frequencies, the signal will tend to be transmitted in the part of the copper core close to the outer surface, so in order to reduce attenuation, the diameter of the cable must be increased.

Therefore, it is difficult to greatly improve the limit rate of copper cables.

The latter problem, the theoretical rate of 1000base-tx and 1000base-fx is the same, but in actual use, it is not good, for example, affected by cable quality, electromagnetic interference, and light quality, it is possible to deteriorate the signal and produce bit errors.

Hope mine, helped! Hehe.

The carrier wave is the medium through which the signal is carried. For example: radio waves.

The frequency range of the carrier wave is limited, and the low-speed signal (e.g., electrical signal, sound wave) must be modulated to the high-frequency part in order to be transmitted in the channel of the radio wave. Low-speed signals cannot propagate in the channel if they do not reach the frequency points used.

Therefore, the frequency of the carrier is higher than the frequency of the signal.

Upstairs is very good, to add, in wireless transmission, electromagnetic waves travel approximately at the speed of light, which has nothing to do with frequency, and the baud rate is related to the carrier frequency.

The bandwidth depends on the baseband symbol rate, which is exactly half the baseband symbol rate, not the information rate.

The power spectrum of the digital baseband signal includes a continuum spectrum and a discrete spectrum, and the continuum always exists. Discrete spectra may not exist: If the signal is bipolar and the two polar symbols are equal, there is no discrete spectrum.

1. The reason for the bit error in the digital baseband system is the influence of the sum of sampling moments.

2.Equalizers and systems are often used in digital baseband systems to improve the performance of the system.

3.In order to measure the degree of inter-symbol interference in the baseband transmission system, the most intuitive way is to:

4.Bipolar digital baseband signal, discrete component of equal time approximation code rate fs, discrete component of unequal time approximation fs.

5.The role of a finite-length transverse filter is inter-symbol crosstalk.

6.Intersymbol crosstalk is the value of a symbol that is identified by other symbols.

Definition of Baseband Transmission In data communication, a digital data signal representing a binary bit sequence of a computer is a typical rectangular pulse signal; The natural frequency band of the rectangular pulse signal is called the basic frequency band, which is referred to as the baseband, and the rectangular pulse signal is called the baseband signal; On the digital communication channel, the judgment method of directly transmitting the baseband signal is called baseband transmission. At the transmitter end, the data transmitted by the baseband is transformed by the encoder into a directly transmitted baseband signal, such as a Manchester coded or differential Manchester coded signal; At the receiving end, the decoder restores the same rectangular vein as the transmitter to dig up the bright signal; Baseband transmission is one of the most basic methods of data transmission. Broadband transmission: Divides the channel into sub-channels to transmit audio, **, and digital signals separately, which is called broadband transmission.

Broadband is a wider frequency band than audio bandwidth, which includes most of the electromagnetic spectrum. The system that uses this broadband transmission is called a broadband transmission system. With the help of frequency band transmission, the link capacity can be split into two or more channels, each channel can carry a different signal, which is a broadband transmission.

All channels in a wideband transmission can send signals at the same time. Such as CATV, ISDN, etc. The transmission frequency band is very wide at 》=128kbps Wideband is to transmit analog signals, and the data transmission rate range is 0 400 mb s, while the transmission rate commonly used is 5 mb s to 10 mb s.

It can accommodate all broadcasts and can carry out high-speed data transmission. Broadband transmission systems are mostly analog signal transmission systems. Generally speaking, broadband transmission has the following advantages over baseband transmission:

It can transmit sound, image and data information in a single channel, making the system multi-purpose; A broadband channel can be divided into multiple logical baseband channels to achieve multiplexing, so the capacity of the channel is greatly increased. Wideband transmission is farther than baseband, because baseband transmission directly transmits digital signals, and the higher the transmission rate, the shorter the distance that can be transmitted.

Which transmission method do you use? What signal? Scheme?

1.wireless transmission; The signal is dispersed and transmitted on the carrier signal, and the receiver unplugs the signal and tunes it out.

2.In electronic circuits, signal transmission is generally carried out by direct connection or "coupling".

The effective ways are; Detection, frequency discrimination (frequency discrimination), filtering, notching, etc.