Hello Rui,
Thank you for the detailed presentation, and your answer to my questions.
Due to time limitations, some few more questions are put here in offline.
- Your presentation proposes to use 802.11b for the DL signal to be used for UL backscatter. This is somehow different than RFID and also less efficient in terms of
2.4 spectrum usage. Can we consider also CW, which is more like RFID and also more spectrally efficient instead?
- Your preference to use 802.11b preambles instead of 802.11g limits the usage of the AMP to fewer channels. For example, if the phone is associated with AP over channel
5, it will not be able to read tags. Another aspect for 802.11b preambles is that the efficiency is much lower since these preambles are very long.
- It is clear that PIE and FM0 were defined for RFID some time ago and optimized its performance (specifically distancing from the backscatter CW). However, since
there is no expectation to use RFID interrogators to read these AMP tags, the advantages of FM0 and PIE over plain Manchester are required for decision. Specifically, that no 3 dB loss due to the differential modulation is incurred and that Manchester is not
sufficient to overcome 10% clock offsets of close range backscatter. It would be efficient if we can use the same coding for all solutions.
Thank you!
Amichai
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