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| 型號(hào)： | MQ80C32E-30/883 |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 30 MHz, MICROCONTROLLER, CQFP44 |
| 文件頁(yè)數(shù)： | 198/198頁(yè) |
| 文件大?。?/td> | 4822K |
| 代理商： | MQ80C32E-30/883 |
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99
8111C–MCU Wireless–09/09
AT86RF231
8.6
Link Quality Indication (LQI)
According to IEEE 802.15.4, the LQI measurement is a characterization of the strength and/or
quality of a received packet. The measurement may be implemented using receiver ED, a sig-
nal-to-noise ratio estimation, or a combination of these methods. The use of the LQI result by the
network or application layers is not specified in this standard. LQI values shall be an integer
ranging from 0x00 to 0xFF. The minimum and maximum LQI values (0x00 and 0xFF) should be
associated with the lowest and highest quality compliant signals, respectively, and LQI values in
between should be uniformly distributed between these two limits.
8.6.1
Overview
The LQI measurement of the AT86RF231 is implemented as a measure of the link quality which
can be described with the packet error rate (PER) for this link. An LQI value can be associated
with an expected packet error rate. The PER is the ratio of erroneous received frames to the
total number of received frames. A PER of zero indicates no frame error, whereas at a PER of
one no frame was received correctly.
The radio transceiver uses correlation results of multiple symbols within a frame to determine
the LQI value. This is done for each received frame. The minimum frame length for a valid LQI
value is two octets PSDU. LQI values are integers ranging from 0 to 255.
As an example, Figure 8-6 on page 99 shows the conditional packet error when receiving a cer-
tain LQI value.
Figure 8-6.
Conditional Packet Error Rate versus LQI
The values are taken from received frames of PSDU length of 20 octets on transmission chan-
nels with reasonable low multipath delay spreads. If the transmission channel characteristic has
higher multipath delay spread than assumed in the example, the PER is slightly higher for a cer-
0
0.1
0.2
0.3
0.4
0.5
0.6
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0.8
0.9
1
0
50
100
150
200
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PER
LQI
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MR80C52CXXX-16/883R | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44 |
| MR80C52TXXX-16SB | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44 |
| MD83C154TXXX-L16P883D | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40 |
| MD83C154XXX-L16P883D | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40 |
| MQ80C32E-16SB | 8-BIT, 16 MHz, MICROCONTROLLER, CQFP44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MQ82370-20 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MQ8238020 | 制造商:Intel 功能描述:CONTROLLER: OTHER |
| MQ82380-20 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MQ82380-20/R | 制造商:Rochester Electronics LLC 功能描述: |
| MQ82592 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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