AN432 RX BER MEASUREMENT ON EZRADIOPRO® WITH A LOOPED BIT SEQUENCE
The purpose of this application note is to provide a description of a simple procedure that allows measurement of Bit Error Rate (BER) in RX mode on EZRadioPRO® receiver-capable devices, such as the Si443x family of transceivers and the Si433x family of receivers. The method uses a continuously-looped bit sequence (e.g.,continuous preamble, PN9, PN11 etc.) without the need for operation in Packet mode as with the usual Preamble/Sync/Payload packet structure.
Although there are limitations on the use of this procedure, it is quite useful for quick verification of the receive sensitivity of the RFIC, with a minimal amount of lab test equipment required. In fact, the test procedure described in this application note provides the ability to measure BER using only the MSC-DKLB2 (load board) and WDS Software script (in addition to standard RF lab test equipment, such as signal generator, oscilloscope, and BER analyzer); no microcontroller or firmware is required.
This application does not discuss methods of measuring Packet Error Rate (PER) in detail. Validation of correct reception of an entire packet is a function that is best performed by a microcontroller (e.g., by polling the PKT_VALID interrupt). As this application note is focused more on tests that may be performed with only a Load Board, RF Test Card, and minimal peripheral test equipment, the topic of measuring PER is left for discussion in SDBC-DK3 User's Guide Rev 0.3.
However, there is an approximate relationship between BER and PER sensitivity levels that may be used as a guide or “rule of thumb”. In many applications, the RF input level required to obtain PER = 1% is found to be approximately 2 to 3 dB higher (stronger) than the RF input level required to obtain BER = 0.1% (1E-3). This relationship is clearly dependent upon the length of the packet; 1 bit error in a packet length of 10 bytes and 1 bit error in a packet length of 100 bytes result in the same PER value but considerably different BER values.
As a result, the BER sensitivity measurements obtained with the test methods described in this document may be useful for estimating a corresponding value of PER performance.
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Si433x 、 MSC-DKLB2 、 Si443x 、 EZRadioPRO 、 443x-T-B1-B 、 443x T-B1-D 、 443x T-B1-A 、 443x-T-B1-C 、 443x-T-B1-D-x 、 443x-T-B1-B-x 、 443x-T-B1-A-x 、 443x-T-B1-C-x 、 EZRADIOPRO® |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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4/10 |
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Rev.0.2 |
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AN432 |
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1.2 MB |
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