EC/Io, rscp, Eb/NT, Eb/IO)

E is short for energy,
C is chip (Code chip) refers to the chip in 3.84mcps,
EC refers to the average energy of a chip. Note that it is the energy in the unit of lugs/second.
I is short for interfece (interference,
O isOther abbreviation,
Io is the meaning of Total interference, which also refers to the energy density.

EC/IO: reflectsThe ratio of the signal strength to the interference level of the adjacent area.
Because the pilot channel does not contain bit information, EC/Io is often used instead of EB/NT to indicate channel quality.

Rscp: the power of the received signal code, which is the receiving power of a code word on the P-CPICH;
RSSI ed signal strength indicator (indicating the signal strength) indicates the bandwidth of the corresponding channel;

 

EB/NT, where B refers to bit, N refers to noise, and T refers to total, which is equivalent to the C/I load ratio in the GSM system. EB Chinese is the average bit energy (in general, a bit is composed of many chips, so its energy is n × EC), NT refers to the total noise, this includes white noise, interference from other residential areas, interference from other users in the residential area, and interference from users' own multi-path.

EB/No, which refers to the power spectral density of white noise. The unit is w/Hz, and no is short for noise. (Related to the device sensitivity, such as the demodulation threshold)
 

EC/Io, Eb/NT

EC/Io and Eb/NT cannot be said to be two standards. They are two Representation Methods of signal processing at different stages, EC/IO indicates the ratio of the Code piece energy after the spread spectrum to the total power spectrum density in the bandwidth, Eb/NT is not before the spread spectrum, the ratio of bit energy of useful signals to the power spectral density of all interference signals except useful signals. The demodulation thresholds are expressed by EB/NT.

EB/Nt = EC/IO + spread spectrum gain

EC: the code piece energy transmitted over the bandwidth of 1.23m. It can be the code piece energy of the channel such as the pilot, synchronization, paging, and service. However, because only the pilot channel does not need spread spectrum, it is directly transmitted on the bandwidth of 1.23m, so it is generally used to represent the power of the channel. Other channels are represented by EB.

EB: it refers to the information energy of the channel that requires spread spectrum except the pilot channel, including channels such as synchronization, paging, and business. It is the ratio of the transmit power to the Information Rate of the channel.

No: thermal noise power spectral density (not mentioned now. This parameter is derived from the is2000 test protocol. is97d and is98b test specifications are actually NT; NT is based on the is2000 series of protocols)

NT: Total interference power spectrum density. Is the total energy in the bandwidth of 1.23m minus its own information energy, that is, the total interference except its own energy.

IO: the power spectral density of all 1.23m bandwidth, which is also the energy, including all interference, noise, and effective energy.

EC/IO: represents the ratio of energy on the channel to total interference, so it is always negative, because Io is all energy, including the energy of the channel itself.

EB/NT: represents the ratio of Information energy of various channels (except the Pilot Channel) to total interference other than its own information energy. At present, this ratio must be greater than zero, can be effectively demodulated.

Note: ec eb nt Io indicates both the energy and power spectral density, in the unit of lugs or watt/Hz. It is often expressed by DBM * s and DBM/Hz. 1 in-ear monitoring = 1 watt * Second,

EC/IO Eb/NT is the ratio, and the Unit is dB.

EB/NT, where B refers to bit, N refers to noise, and T refers to total, which is equivalent to the C/I load ratio in the GSM system. EB Chinese is the average bit energy (in general, a bit is composed of many chips, so its energy is n × EC), NT refers to the total noise, this includes white noise, interference from other residential areas, interference from other users in the residential area, and interference from users' own multi-path.

The quality of data service channels is measured by EB/NT.

EB/No, which refers to the power spectral density of white noise. The unit is w/Hz, and no is short for noise. (Related to the device sensitivity, such as the demodulation threshold) EB/NT, where B refers to bit, N refers to noise, T refers to total, it is equivalent to the C/I load ratio in the GSM system. EB Chinese is the average bit energy (in general, a bit is composed of many chips, so its energy is n × EC), NT refers to the total noise, this includes white noise, interference from other residential areas, interference from other users in the residential area, and interference from users' own multi-path.
The quality of data service channels is measured by EB/NT.

EB/No, which refers to the power spectral density of white noise. The unit is w/Hz, and no is short for noise. (Related to the device sensitivity, such as the demodulation threshold)

 

1. Symbols

1.1 signal symbol

1. C: carrier power

2. EC: the energy of the QR code.

3. EB: Bit energy in the business channel. The relationship between EC and 95 and 1X is EB = EC + w/R (db)

4. IOR: The concept in do, which refers to the power spectral density of useful signals.

 

1.2 noise disturbance symbol
1. I: Total interference power, including thermal noise, excluding useful signal power.
2. IO: interference power spectrum density, including thermal noise. It is mainly used in combination with EC on the pilot channel to form EC/Io.
3. No Eb/NO can be interpreted as? : Thermal noise power spectral density. The formula is 10lg (KT) + NF. (CDMA system engineering manual p652) Such ratio of the total energy (including pilot, DRC and ACK) Written ed per tenna from that mobile during an information bit to thermal noise PSD. (80-h0447-1, X4 p10)
4. nt: noise power spectrum density, including thermal noise and interference. (NT. The specified tive noise power spectral density at the sector RF input ports.) limit PP2 C. s0032. "Fig 2.3.1 demonstrates the EC, P/no per? EC, P/NT per antenna (or? Reverse traffic channel per versus total antenna at 0% loading in which situation Nt = no ). "" due to the assumed geometry, IOR/NT saturates while ior/no-> ∞. "in 80-h0447-1, X4

5. IOC: interference power spectral density of other residential areas and users, excluding hot noise. Note: Noise (rather than hot noise) generally refers to hot noise and interference.

 

1.3 ratio symbol

1. EC/IO: the EC/IO of the pilot channel. The SNR of 95 and 1X is equal to that of the Pilot Channel.

2. EC/NT: Same as EC/Io, but used to use EC/Io.

3. Eb/NT: The demodulation threshold. It is the same as EB/NO in the absence of interference. Otherwise, it is smaller than Eb/No.

4. Eb/No: it is the same as EB/NT when there is no interference (0 load in reverse direction), and increases with the increase of load (interference.

5. c/I: Load-to-dry ratio

6. SNR: signal noise ratio, snrreq = (EB/no)/(W/R ).

7. ior/IOC: Used in evdo to indicate the ratio of useful signal spectral density to interference spectral density.

8. ior/(IOC + NO): Used in the evdo forward direction. It refers to the ratio of useful signal spectral density to noise spectral density, which is equal to C/I, SNR, and integrated EC/Io.

 

 

2. Relationship between Symbols

2.1 signal symbols

1. c and EC: C are the carrier power, EC is the code piece energy, and the relationship between them in CDMA is c = W * EC. (W indicates the bitrate ).

2. Bits of EB and EC: 95 and 1X business channels, EB = EC + w/R (db ).

3. ior and EC: IOR are the power spectral density of useful signals. They are a comprehensive value, and the product of bandwidth W is the total power. From this point of view, it is the same as the value, why not use EC, the main reason is that the EC values in the forward direction of a time slot in do are different. Therefore, IOR is equivalent to a comprehensive EC, or an average of the forward EC.

 

2.2 interference symbols

1. Io and NT:Both are noise spectral density. The thermal noise spectral density and interference spectral density are the same. Io focuses on interference, While NT focuses on noise.

2. nt and no: NT indicates the thermal noise spectral density and interference spectral density, while no indicates the thermal noise spectral density.

3. I and I: I is the total interference power (including thermal noise), and I/O is the interference spectral density (including thermal noise). The relationship between the two is I = W * IO, where W is the bandwidth.

4. Io and IOC: Io is the interference spectral density that includes hot noise, and IOC is the interference spectral density that does not include hot noise. IO = IOC + NO

2.3 ratio symbol

1. EC/Io, EC/NT, SNR, C/I, IOR/(NO + IOC) EC/Io and EC/NT are the same as SNR and C/I and IOR/(NO + IOC.

2. EB/NT and EC/Io, EC/NT, SNR, C/I, IOR/(NO + IOC) EB/NT are the above ratios plus W/R (db ).

 

Ratio of EB/no per bit energy to noise power density (noise ratio)

Ratio of EB/IO per bit energy to interference power density (Interference Ratio)

EC/No, ratio of energy to noise power density (noise ratio)

EC/IO ratio of energy per code piece to interference power density (Interference Ratio)

EC/IO: the EC/IO of the pilot channel. The SNR of 95 and 1X is equal to that of the Pilot Channel.
EC/NT: Same as EC/Io, but used to use EC/Io.
EB/NT: The demodulation threshold. It is the same as EB/No when no interference exists. Otherwise, it is smaller than Eb/No.
EB/No: it is the same as EB/NT when there is no interference (0 load in the reverse direction), and increases with the increase of load (interference.
Ior/IOC: Used in evdo, which refers to the ratio of useful signal spectrum density to interference spectrum density.
Ior/(IOC + NO): Used in the evdo forward direction. It refers to the ratio of useful signal spectral density to noise spectral density, which is equal to C/I, SNR, and integrated EC/Io.

N0 indicates the noise power spectral density, while Io focuses on Interference (included noise). Eb/N0 and Eb/Io are sometimes common, in different scenarios, the dominant factor is noise or interference.