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參數(shù)資料
| 型號： | MD80C52EXXX-16SBD |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40 |
| 封裝： | 0.600 INCH, CERAMIC, DIP-40 |
| 文件頁數(shù)： | 3/198頁 |
| 文件大小： | 4822K |
| 代理商： | MD80C52EXXX-16SBD |
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100
8111C–MCU Wireless–09/09
AT86RF231
tain LQI value. Since the packet error rate is a statistical value, the PER shown in Section 8-6
“Conditional Packet Error Rate versus LQI” on page 99 is based on a huge number of transac-
tions. A reliable estimation of the packet error rate cannot be based on a single or a small
number of LQI values.
8.6.2
Request an LQI Measurement
The LQI byte can be obtained after a frame has been received by the radio transceiver. One
additional byte is automatically attached to the received frame containing the LQI value. This
information can also be read via Frame Buffer read access, see Section 6.2.2 “Frame Buffer
Access Mode” on page 20. The LQI byte can be read after IRQ_3 (TRX_END) interrupt.
8.6.3
Data Interpretation
According to IEEE 802.15.4 a low LQI value is associated with low signal strength and/or high
signal distortions. Signal distortions are mainly caused by interference signals and/or multipath
propagation. High LQI values indicate a sufficient high signal power and low signal distortions.
Note, the received signal power as indicated by received signal strength indication (RSSI) value
or energy detection (ED) value of the AT86RF231 do not characterize the signal quality and the
ability to decode a signal.
As an example, a received signal with an input power of about 6 dB above the receiver sensitiv-
ity likely results in a LQI value close to 255 for radio channels with very low signal distortions.
For higher signal power the LQI value becomes independent of the actual signal strength. This
is because the packet error rate for these scenarios tends towards zero and further increased
signal strength, i.e. increasing the transmission power does not decrease the error rate any fur-
ther. In this case RSSI or ED can be used to evaluate the signal strength and the link margin.
ZigBee networks often require the identification of the "best" routing between two nodes. Both,
the LQI and the RSSI/ED can be used for this, dependent on the optimization criteria. If a low
packet error rate (corresponding to high throughput) is the optimization criteria then the LQI
value should be taken into consideration. If a low transmission power or the link margin is the
optimization criteria then the RSSI/ED value is also helpful.
Combinations of LQI, RSSI and ED are possible for routing decisions. As a rule of thumb RSSI
and ED values are useful to differentiate between links with high LQI values. Transmission links
with low LQI values should be discarded for routing decisions even if the RSSI/ED values are
high. This is because RSSI/ED does not say anything about the possibility to decode a signal. It
is only an information about the received signal strength whereas the source can be an
interferer.
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