发明公开
EP1432193A1 Integrated modem circuit with software implemented PLL filter
审中-公开
Integrierte调制解调器软件实现了PLL滤波器
- 专利标题: Integrated modem circuit with software implemented PLL filter
- 专利标题(中): Integrierte调制解调器软件实现了PLL滤波器
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申请号: EP02293129.9申请日: 2002-12-18
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公开(公告)号: EP1432193A1公开(公告)日: 2004-06-23
- 发明人: Antoine, Philippe , Gendarme, Christophe Bernard André , Van Hoogenbemt, Stefaan Margriet Albert
- 申请人: ALCATEL
- 申请人地址: 54, rue La Boétie 75008 Paris FR
- 专利权人: ALCATEL
- 当前专利权人: ALCATEL
- 当前专利权人地址: 54, rue La Boétie 75008 Paris FR
- 代理机构: Narmon, Gisèle Marie Thérèse
- 主分类号: H04L27/26
- IPC分类号: H04L27/26 ; H04L7/00
摘要:
An integrated modem circuits comprising processor-systems (1) and hardware (2,3) for exchanging signals with another modem circuit 1 Mb/s or more are provided with low cost, accurate, flexible filter software (11) for embodying a digital phase locked loop filter. Said hardware (2,3) comprises fast modules (22,32) for compensating for sample processing. The insight of hardware phase locked loops being expensive, not accurate, inflexible and of software phase locked loops being slow results in the basic idea of the phase locked loop calculations being done in software and the compensations being done in hardware. Sample software (14,15) processes samples (shifting - adding - deleting). Said hardware (2,3) comprises in the transmission path (2) mappers (21), rotors (22) and inverse Fourier transformators (23) and in the receiving path (3) Fourier transformators (33), rotors (32) and demappers (31). Control software (12,13) controls said rotors (22,32). In software in processor-system (1) there are initialization steps (101), reading steps (102), detection steps (104,105,106,111,112,115) executing steps (108,109), adaptation steps (110,116,117), and incrementation steps (114,118).
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