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HFA3863 Datasheet(PDF) 21 Page - Intersil Corporation |
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HFA3863 Datasheet(HTML) 21 Page - Intersil Corporation |
21 / 39 page 4-21 Signal Quality Estimate A signal quality measure is available on CR51 for use by the MAC. This measure is the SNR in the carrier tracking loop and can be used to determine when the demodulator is working near to the noise floor and likely to make errors. Figure 17 shows the performance of the SQ measure versus signal to noise level. ED Threshold The performance of the ED threshold is shown in Figure 18. Setting this threshold will effect CCA only. Using ED as part of the CCA measure will allow deferral to large signals even if they are not correlated to the desired spread signals. ED can be read from CR61 bit 4. Using ED and RSSI can assist the MAC in determining the presence of non correlating signals such as frequency hoppers or microwave ovens. For example, the MAC can elect to try to transmit over microwave oven interference but not count the results in rate shifting algorithms. A Default Register Configuration The registers in the HFA3863 are addressed with 7-bit numbers where the lower 1 bit of an 8-bit hexadecimal address is left as unused. This results in the addresses being in increments of 2 as shown in the table below. Table 9 shows the register values for a default 802.11 configuration with various rate configurations. The data is transmitted as either DBPSK, DQPSK, or CCK depending on the configuration chosen. It is recommended that you start with the simplest configuration (DBPSK) for initial test and verification of the device and/or the radio design. The user can later modify the CR contents to reflect the system and the required performance of each specific application. -100 -80 -60 -40 -20 0 120 100 80 60 40 20 0 SIGNAL LEVEL IN dBm RSSI FIGURE 16. RSSI vs SIGNAL LEVEL -10 -5 0 5 10 15 20 25 0 10 20 30 40 50 60 70 80 90 100 SNR IN THE SPREAD BANDWIDTH AT 1Mbps PER MEAN STDDEV FIGURE 17. SIGNAL QUALITY MEASURE AND PER vs SNR 40 20 10 0 -10 020 10 30 40 30 SNR IN SPREAD BANDWIDTH STARTS MISSING MISSING FIGURE 18. ED THRESHOLD vs SNR IN dB AT 1Mbps HFA3863 |
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