发明名称 |
Method and apparatus for an X-DSL modem supporting multiple X-DSL line codes |
摘要 |
An X-DSL modem supporting multiple X-DSL line codes including discrete multi-tone (DMT) and carrierless phase and amplitude (CAP). The modem includes: components coupled to one another to form a transmit path and a receive path. The components include an encoder component and a Fourier transform component. The encoder component encodes data associated with a CAP communication channel into QAM symbols and encodes data associated with a DMT communication channel into DMT sub-symbols. The Fourier transform component couples to the encoder component on the transmit path for transforming DMT sub-symbols from a frequency-to-time domain and for transforming QAM symbols from the time-to-frequency domain followed by a filtering in the frequency domain and a subsequent transformation back from the frequency-to-time domain to effect a pulse shaping function without requiring a discrete pulse shaping component in the transmit path.
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申请公布号 |
US6959036(B1) |
申请公布日期 |
2005.10.25 |
申请号 |
US20010776067 |
申请日期 |
2001.02.02 |
申请人 |
IKANOS COMMUNICATIONS INC. |
发明人 |
REZVANI BEHROOZ;SMITH DALE;HEIDARI SAM;SHAHRI HOMAYOUN |
分类号 |
H04B1/38;H04L12/56;H04L25/49;H04L27/00;H04L27/26;(IPC1-7):H04B1/38 |
主分类号 |
H04B1/38 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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