Packet Error Rate Tester
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C.S0033 Tests Performed Using PER How is a PER Measurement Made? Packet Error Rate (PER) is used to test the performance of an access terminal's receiver. PER is the ratio, in percent, of the number of FTAP or FETAP Test Packets not bit error rate tester successfully received by the access terminal (AT) to the number of FTAP or FETAP Test
Packet Error Rate Formula
Packets sent to the AT by the test set. See Forward Test Application Protocol (FTAP) , Multi-carrier Test Application Protocol and Forward Enhanced
Packet Error Rate Definition
Test Application Protocol (FETAP) . To perform a packet error rate measurement, the test set sends an FTAP (when current physical layer subtype is subtype 0) or FETAP Test Packet (when current physical layer subtype is subtype
Packet Error Rate Calculation
2) or FMCTAP Test Packet (when current physical layer subtype is subtype 3) to the access terminal. See Release A Physical Layer Subtype or Release B Physical Layer Subtype to configure the physical layer subtype. Each packet contains 16 FCS (Frame Check Sequence) bit, which provide information about the packet. If the AT is able to decode the packet and the FCS checks (the information relayed by the FCS matches the packet characteristics), then the wifi packet error rate packet is successfully received. The AT sends one or more FTAP/FETAP/FMCTAP Loop Back Packets to the test set to indicate how many FTAP/FETAP/FMCTAP Test Packets were successfully received for each 16-slot "observation interval" (frame). The AT sends one Loop Back Packet (or more, if needed to convey all of the records) containing a record for each FTAP/FETAP/FMCTAP Test Packet in the observation interval. The Loop Back Packets are queued for transmission on the Reverse Traffic Channel, and the AT must provide buffering for at least 8 FTAP/FETAP/FMCTAP Loop Back Packets. An FTAP/FETAP/FMCTAP Loop Back Packet is generated even if no FTAP/FETAP/FMCTAP Test Packets were received during the 16-slot observation interval. In performing the PER measurement, the test set: always operates with 100% packet activity (see Fixed Settings ). 100% packet activity means that all slots contain Forward Traffic Channel or Control Channel packets (data). The test set fills any empty slots with filler data directed to a random AT other than the AT under test. (0% packet activity means that the source is pulsed off when there is no data to transmit in the slot, and then pulsed on to transmit the MAC and Pilot Channels. This is not supported by the test set.) always implements forced single encapsulation. Forced single encapsulation means that there is always only one valid MAC Packet per Phy
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Федерация 中国 (China) 日本 (Japan) 대한민국 (Korea) 台灣 (Taiwan) See All Countries Toggle navigation INNOVATIONEN PRODUKTE SUPPORT COMMUNITY Deutschland WLAN Packet Error Rate Test in http://www.ni.com/example/31378/en/ LabVIEW Publish Date: Apr 05, 2010 | 6 Bewertung(en) | 2,67 von 5 | Print | Submit your review Overview This example program uses the WLAN toolkit for LabVIEW to generate WLAN packets and determine the percentage that are received correctly. The example was developed to test antennas that were intended to be used for transmitting error rate WLAN data. Introduction This example program uses the WLAN toolkit for LabVIEW to generate WLAN packets and determine the percentage that are received correctly. The example was developed to test antennas that were intended to be used for transmitting WLAN data. To do this, we generate a WLAN signal on an RF Signal Generator and packet error rate acquire the data on an RFSignal Analyzer. We don't actually compare the individual bits that are transmitted, but instead we check to make sure the header information was correct and make sure there were not triggering errors or missed packets. The program gradually decreases the power by the amount specified and generates a specific number of packets at each power. In the end, you are given a chart that displays packet error rate against generation power. Requirements This example program needs several things to work. First, you need LabVIEW, the WLAN toolkit, and drivers for all the required hardware installed on a computer. As far as hardware goes, the example program requires an RF Signal Generator, an RF Signal Analyzer, a preamplifer (NI-5690), and antennas to test. Using the Example Program Because you will be transmitting data using antennas, we need to characterize the expected path loss and determine the amount of gain to apply using the preamplifier. To do t
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