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2018-1-17 19:57| : ˷| 鿴: 76| : 1

ժҪ: ƵBluetoothߴϵͳһϵͳвڹ̶ĻվӲάͬи豸λƽȵ,ӲҪԱûĸԤ,ɸBluetooth豸Զ ...
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Bluetoothߴϵͳһϵͳвڹ̶ĻվӲάͬи豸λƽȵ,ӲҪԱûĸԤ,ɸBluetooth豸Զɡ

ͳһһΧڽһгԱ,BluetoothͬһΧͬʱʮ໥֮ûκͬϵ磨Bluetoothг֮Ϊ΢΢,PiconetЩPiconet˴֮䲻ɱػ໥š,ʹõƵ2.4 GHzISM(ҵѧҽѧ)ƵΣ24002 483.5 MHz,ȫͨõƵ,ƵеĸֶпԤĸԴ΢¯ijЩ豸ȣ,ʹøƵεߵϵͳ802.11߾ȣҲȽصĸ,ټϲͬBluetooth΢΢֮໥,Bluetoothߴ价˵൱ӡ

ܿŵһͨijӦ㷨ҵISMƵδظŵIJ,һDzƵBluetoothõƵƵ,FH-CDMABluetooth,ISMƵαΪ791 MHzƵ,Ƶ1 MHz,˴֮ƵϵͳƵα,,Կزһɱ仯ĶƵƵƼأMFSK

Ͽ,źűչһܿƵ,һʱֻһСƵαʹ,ISMƵεĴ󲿷ָŶַܡBluetoothĸ΢΢Ƶб˴֮䲻,ʱš

Bluetooth֮ԲƵ,һΪͨίԱᣨFCCISMƵβƵ,һǸPiconet֮˴ûϵ,ͬBluetoothŵõƵ/ʱָ÷,ŵΪɸ625sʱ϶,ÿһʱ϶ӦͬƵʡ

ƵΪ1600/,ÿһʱ϶Դһʱ϶ݰ3ʱ϶5ʱ϶ݰʱ,Ƶв䣨ÿʱ϶ӦƵ뵥ʱ϶ͬ,ڴһݰĹƵ,ʹú͵һʱ϶ӦƵ

Bluetooth淶10Ƶѡ񷽰,5ֶӦ79ϵͳƵ㷨Ҫָ£ƵBluetooth豸־豸Bluetoothַλ28 bit,ÿʱ϶Ƶɸʱ϶λʱ϶ţBluetooth豸־28λ,228Ƶ,dz޴ʱ϶ţλ27λ豸CLK,һƵгʱΪ227625̣23 hƵ32ƵǵķΧٴ64 MHz,ÿƵʵķʻᶼͬġ

ɼBluetoothƵ޴,ÿжнϺõԡ

ΪҪ,ʱ̵ƵȫBluetooth豸־ʱӾ,߼·ʵ,Ҫд洢,Ƶʵּ򵥡Bluetooth豸־ʱҪ;ǶԿྶ˥䡣ڶྶ˥Ĵڣʹͬһ֡·ͬû˵ʱкصƵϵĻز֮໥ţӰܡ

⣬ѭǰ׺ʹIFFT FFTԭԾѭӦźŴӶȡ֪ôͿô

2.ȽϸĹǣ

OFDMźŷԭǣûźԴеķʽ뷢ΪR/롣ЩȱһУб任УʹźԲеķʽ·ϡM·ϵκһϵݴΪR/M/롣

OFDMһпٸҶ任ģ飬пٸҶ任ٸҶ任԰ƵɢתΪʱɢݡ

ɴˣûԭʼݾͱOFDMƵݽ˾ٸҶ任ֵ֮һѭǰ׺ӵֵǰγһѭչOFDMϢ֡ѭǰ׺õɢϵͳԭеһ

֪ʱʱźŵľ͵źƵʽij˻ǣɢʱһDzģʹ޾޴ֵNһźԵģڸ£źſԱԲܾ)

Ϊֻʹ޵ֵNֻѭǰ׺ʹOFDMϢǸȤʱڳԡѭչϢֵٴͨһУתģ顣Ȼմеķʽͨŵʵ˲͵ƣڴУŵijӦʱź˸š

ѭǰ׺ʹOFDMźűֳԣ־ͳһԲܾɢʱϵͳԭԲܾ൱OFDMźŵƵӦŵƵӦij˻뷢෴IJյźʱźš

ŵӰ췢һı仯յźžһУеתҰѭǰ׺ѭǰ׺ûɾκϢѭǰ׺еϢġʹѭǰ׺Ϊ˱֤ǰᵽľԵijţҪڵȻʵŵʵƵϵͳȷͬ

Դˣ迼¸㻻ʱ,Ƶл, ͬƵмлΪѸ١

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˷ 2018-1-17 20:37
Ƶ (Frequency-Hopping Spread SpectrumFHSS)ͬͬʱ£ضʽխƵزѶţһضĽFHSSѶŶԣֻFHSSչѶſرOne-to-ManyķظƵЩƵѶűFCCҪʹ75ϵƵѶšƵһƵʵʱ (Dwell Time)Ϊ400ms

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