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| OPB840W11Z资料 | |
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OPB840W11Z PDF Download |
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File Size : 116 KB
Manufacturer:TT /OPTEK Description:DMT Signal A DMT signal is basically the sum of N inde- pendently QAM modulated signals, each carried over a distinct carrier. The frequency separation of each carrier is 4.3125kHz with a total number of 256 carriers (ANSI). For N large, the signal can be modelled by a gaussian process with a certain amplitude probability density function. Since the maximum amplitude is expected to arise very rarely, we decide to clip the signal and to trade- off the resulting SNR loss against AD/DA dy- namic. A clipping factor (Vpeak/Vrms = crest fac- tor) of 5 will be used resulting in a maximum SNR of 75dB. ADSL DMT signals are nominally sent at -40dBm/Hz 3dB (-3.65dBm/carrier) with a maximal power of 100mW for down link transmitter and 15.7mW for uplink transmitter. DMT symbols are transmitted without window- ing causing sin (x)/x like sidelobes. For spectral response shaping, the 1st sidelobe level is as- sumed to be 13dB under the carrier level with an attenuation of -20dB/dec. The minimum SNR + D neede d for DMT carrier demodulation is about (3 ⋅ N + 20) dB with a minimum of 38dB were N is the constellation size of a carrier (in bits). |
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| 1PCS | 100PCS | 1K | 10K | ||
| 价 格 | |||||
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型 号：OPB840W11Z 厂 家：TT /OPTEK 封 装： 批 号：07+ 数 量：6791 说 明：原装正品 |
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运 费：所有运费均有我司承担 所在地：深圳 新旧程度： |
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| 联系人：申小姐 |
| 电 话：0755-83330991,0755-83047629 |
| 手 机：15811820920 |
| QQ：2355514181 |
| MSN：chipstech-int@hotmail.com |
| 传 真：0755-61658118 |
| EMail：sales@chipstech-int.com |
| 公司地址： 深圳市福田区中航路鼎城国际1017 |
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1. 所有我司提供的货物，均为原厂原装正品！ 2. 我们的报价是不含税价格。含税需要增加相应的税点。
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