收藏本站
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 signal-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 Atmel AT86RF232 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
zero to 255.
As an example, Figure 8-13 shows the conditional packet error rate (PER) when
receiving a certain LQI value.
Figure 8-13. Conditional Packet Error Rate versus LQI.
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
50
100
150
200
250
LQI
That means that a large number of transmission with an identical LQI value results in a
packet error rate shown in the Figure 8-13 . Lost packets have been discarded since in
this case there is no LQI value available.
98
AT86RF232
8321A – MCU Wireless – 10/11
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
AT88CK201BK BRD CRYPTORF READER AT88RF1354
AT88SC-ADK2 KIT ARIS+ DK CRYPTOMEM/COMPANION
AT88SC3216CRF-MY1 IC EEPROM 32KBIT 13MHZ TAG
ATA-2001 LVDT AMPLIFIER
ATAB5429-9-B BOARD BASESTATN UHF RCVR 915MHZ
ATAB5749-3 BOARD XMITTER FOR 315MHZ ATA5749
ATAKSTK511-3 KIT RF MODULE 315MHZ FOR STK500
ATAKSTK512-3 KIT RF MOD REMOTE 315MHZ UNIDIR
相关代理商/技术参数
AT86RF232-ZXR 功能描述:射频收发器 2.4 GHZ ZIGBEE TRANSCEIVER RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
AT86RF233-ZF 功能描述:IC RF TXRX+MCU 802.15.4 32-VFQFN 制造商:microchip technology 系列:- 包装:托盘 零件状态:在售 类型:TxRx + MCU 射频系列/标准:802.15.4，通用 ISM > 1GHz 协议:6LoWPAN，Zigbee? 调制:O-QPSK 频率:2.4GHz 数据速率（最大值）:2Mbps 功率 - 输出:4dBm 灵敏度:-101dBm 存储容量:128B SRAM 串行接口:SPI 电压 - 电源:1.8 V ~ 3.6 V 电流 - 接收:11.3mA ~ 11.8mA 电流 - 传输:7.2mA ~ 13.8mA 工作温度:-40°C ~ 125°C 封装/外壳:32-VFQFN 裸露焊盘 标准包装:490
AT86RF233-ZFR 功能描述:IC RF TXRX+MCU 802.15.4 32-VFQFN 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:在售 类型:TxRx + MCU 射频系列/标准:802.15.4，通用 ISM > 1GHz 协议:6LoWPAN，Zigbee? 调制:O-QPSK 频率:2.4GHz 数据速率（最大值）:2Mbps 功率 - 输出:4dBm 灵敏度:-101dBm 存储容量:128B SRAM 串行接口:SPI 电压 - 电源:1.8 V ~ 3.6 V 电流 - 接收:11.3mA ~ 11.8mA 电流 - 传输:7.2mA ~ 13.8mA 工作温度:-40°C ~ 125°C 封装/外壳:32-VFQFN 裸露焊盘 标准包装:1
AT86RF233-ZU 功能描述:射频收发器 2.4GHz ZigBee Transceiver RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
AT86RF233-ZUR 功能描述:射频收发器 2.4GHz ZigBee Transceiver RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
AT86RF233-ZUS 功能描述:IC RF TxRx + MCU 802.15.4, General ISM > 1GHz 6LoWPAN, Zigbee? 2.4GHz 32-VFQFN Exposed Pad 制造商:atmel 系列:- 包装:托盘 零件状态:过期 类型:TxRx + MCU 射频系列/标准:802.15.4，通用 ISM > 1GHz 协议:6LoWPAN，Zigbee? 调制:O-QPSK 频率:2.4GHz 数据速率（最大值）:2Mbps 功率 - 输出:4dBm 灵敏度:-101dBm 存储容量:128B SRAM 串行接口:SPI GPIO:- 电压 - 电源:1.8 V ~ 3.6 V 电流 - 接收:11.3mA ~ 11.8mA 电流 - 传输:7.2mA ~ 13.8mA 工作温度:-40°C ~ 85°C 封装/外壳:32-VFQFN 裸露焊盘 标准包装:490
AT86RF401 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Smart RF Wireless Data Microtransmitter
AT86RF401E 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Smart RF Wireless Data Microtransmitter