Packet Error Rate Definition
Contents |
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 bit error rate calculation FTAP or FETAP Test Packets not successfully received by the access terminal (AT)
Bit Error Rate Test
to the number of FTAP or FETAP Test Packets sent to the AT by the test set. See Forward Test Application packet error rate to bit error rate Protocol (FTAP) , Multi-carrier Test Application Protocol and Forward Enhanced Test Application Protocol (FETAP) . To perform a packet error rate measurement, the test set sends an FTAP (when current physical layer subtype is
Bit Error Rate Example
subtype 0) or FETAP Test Packet (when current physical layer subtype is subtype 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 bit error rate pdf decode the packet and the FCS checks (the information relayed by the FCS matches the packet characteristics), then the 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 s
be challenged and removed. (March 2013) (Learn how and when to remove this template message) In digital transmission, the number of bit errors is the number of received bits of a data stream over a
Acceptable Bit Error Rate
communication channel that have been altered due to noise, interference, distortion or bit synchronization
Packet Loss Rate Definition
errors. The bit error rate (BER) is the number of bit errors per unit time. The bit error ratio (also packet error rate wireless BER) is the number of bit errors divided by the total number of transferred bits during a studied time interval. BER is a unitless performance measure, often expressed as a percentage.[1] The bit error http://rfmw.em.keysight.com/rfcomms/refdocs/1xevdo/1xevdo_meas_cperror_desc.html probability pe is the expectation value of the bit error ratio. The bit error ratio can be considered as an approximate estimate of the bit error probability. This estimate is accurate for a long time interval and a high number of bit errors. Contents 1 Example 2 Packet error ratio 3 Factors affecting the BER 4 Analysis of the BER 5 Mathematical draft 6 Bit error rate https://en.wikipedia.org/wiki/Bit_error_rate test 6.1 Common types of BERT stress patterns 7 Bit error rate tester 8 See also 9 References 10 External links Example[edit] As an example, assume this transmitted bit sequence: 0 1 1 0 0 0 1 0 1 1 and the following received bit sequence: 0 0 1 0 1 0 1 0 0 1, The number of bit errors (the underlined bits) is, in this case, 3. The BER is 3 incorrect bits divided by 10 transferred bits, resulting in a BER of 0.3 or 30%. Packet error ratio[edit] The packet error ratio (PER) is the number of incorrectly received data packets divided by the total number of received packets. A packet is declared incorrect if at least one bit is erroneous. The expectation value of the PER is denoted packet error probability pp, which for a data packet length of N bits can be expressed as p p = 1 − ( 1 − p e ) N {\displaystyle p_{p}=1-(1-p_{e})^{N}} , assuming that the bit errors are independent of each other. For small bit error probabilities, this is approximately p p ≈ p e N . {\displaystyle p_{p}\approx p_{e}N.} Similar measurements can be carried out for the trans
be down. Please try the request again. Your cache administrator is webmaster. Generated Sun, 23 Oct 2016 20:01:35 GMT by s_nt6 (squid/3.5.20)