Hi XingChang,
we are performing Bluetooth low energy (RF PHY) qualification testing .
Following are the test activities.
Test Details:
Test Purpose: This test verifies that the receiver sensitivity is within limits for non-ideal signals at normal operating conditions when receiving a 1 Ms/s signal. The non-ideal signals used in this test are within the specification limits but deviate from the ideal case.
Initial Condition -
The IUT is set to direct RX mode.
Dewhitening shall be turned off. - Frequency hopping off, fixed frequency -
The tester's transmit power is chosen such that the input power to the IUT receiver is -70 dBm. - The value of MAX_RX_LENGTH (for which the TC is performed) is specified in Section 6.7. -
The IUT is set to assume the transmitter has a standard modulation index.
Test Procedure:
1. The IUT is set to receive at the lowest frequency for testing as defined in Section 6.2.
2. The tester transmits LE test packets with PRBS9 payload (MAX_RX_LENGTH octets). See [4], Section 4, “LE Test Packet Definition” for details.
3. The signal characteristics of the modulated signal transmitted by the tester are to be changed over time. The signal parameter sets to be used are described in Table 4.4. All other parameters shall be as defined in Section 6.1.
4. The tester transmits the first 50 packets using the first parameter set; the next 50 packets are transmitted using the second parameter set etc. Upon completion of the last parameter set, the sequence is repeated. The PER is measured according to Section 6.4.
5. Steps 2–4 are repeated when the IUT is receiving at the remaining frequencies defined in Section 6.2.
In addition to fixed frequency offset, frequency drift over time is added to the signal characteristics. This is implemented by adding a low frequency modulation to the signal. The modulating signal shall be sinusoidal with deviation of 50 kHz and a modulation frequency of 1250 Hz. The modulating signal shall be synchronized with the packets so that packets start alternately at 0° and 180° of the modulating signal.
Expected Outcome
Pass Verdict: All measured values fulfill the following condition:
PER better than 30.8 percent for a minimum of 1500 packets transmitted by the tester if the IUT’s MAX_RX_LENGTH is 37 bytes.
PER better than the value calculated according to the formula specified in Section 6.4.1 of RF PHY spec for a minimum of 1500 packets transmitted by the tester if the IUT’s MAX_RX_LENGTH is greater than 37 bytes.
Observed Outcome-Fail
The test case is failing with PER value as 100% for 1500, 750, 100 and 10 packets. Attaching the logs for reference
Regards,
Harichandana.
