IEEE802.11a. 指導教授 : 高永安 學生 : 陳穎俊. PLCP preamble. PLCP preamble 作傳輸時是 採用 OFDM modulated fixed waveform The IEEE802.11SIGNAL field ,BPSK-OFDM modulated at 6 Mbit/s,shall indicate the modulation and coding rate that shall be used to transmit the MPDU
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指導教授 : 高永安
學生 : 陳穎俊
Operating frequency range
TX RF delay
Transmit and receive antenna port impedance
Transmit and receive operating temperature
The OFDM PHY shall operate in the 5GHz band ,as allocated by a regulatory body in its operational region.
Spectrum allocation in the 5 GHz band is subject to authorities responsible for geographic-specific regulatory domains(e.g.,global,regional,and national).
The set of valid operating channel numbers by regulatory domain
The TX RF delay time shall be defined as the time between the issuance of a PMD.DATA.request to the PMD and the start of the corresponding symbol at the air interface
The slot time for the OFDM PHY shall be 9us, which is the sum of the RX-to-TX turnaround time, MAC processing delay,and CCAdetect time(<4us)
The propagation delay shall be regarded as being included in the CCA detect time
The transmit and receiver antenna port(s) impedance shall be 50 maga if the port is exposed.
Type 1 defined as 0度C 到40度C
Type 1 defined as -20度C 到50度C
Type 1 defined as -30度C 到70度C
Transmit power levels
Transmit spectrum mask
Transmit center frequency tolerance
Transmit modulation accuracy test
The maximun allowable output power according to FCC regulation
Spurious transmissions from compliant devices shall conform to national regulations
The transmission center (symbol clock) frequency tolerance shall be 20% ppm maximun .
The transmission center and the symbol clock frequency shall be derived from the same reference.
Transmitter spectral flatness
The average energy of the constellations in each of the spectral lines –16..-1 and +1..+16 will deviate no more than +-2dB from their average energy.
Transmitter constellation error
The relative constellation RMS error,average over subcarriers, OFDM frames, and pacjets, shall not exeed a data-rate depend-ent value
Receiver minimum input level sensitivity
Adjacent channel rejection
Non-adjacent channel rejection
Receiver maximun input level
The packet error rate shall be less than 10% at a PSDU length of 1000 bytes for rate-dependent input levels shall be the numbers listed in Table 91 or less
The minimum input levels are measured at the antenna connector(NF of 10 dB and 5 dB implementation margi-ns are assumed)
The adjacent (non- adjacent) channel rejection shall be measured by setting the desires signal’s strength 3 dB above the rate-dependent sensitivity specified in Table 91 and raising the power of the interfering signal until 10% PER is caused for a PSDU length of 1000 bytes.
The power difference between the interfering and the desired channel is the corresponding adjacent (non-adjacent) channel rejection.
The receiver shall provide a maximum PER(packet error rate) of 10% at a PSDU length of 1000 bytes, for a maximum input level of –30dB measured at the antenna for any baseband modulation