发明申请
US20040174810A1 Method and system for dynamically increasing output rate and reducing length of a delay chain
有权
用于动态提高输出速率并缩短延迟链长度的方法和系统
- 专利标题: Method and system for dynamically increasing output rate and reducing length of a delay chain
- 专利标题(中): 用于动态提高输出速率并缩短延迟链长度的方法和系统
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申请号: US10731730申请日: 2003-12-09
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公开(公告)号: US20040174810A1公开(公告)日: 2004-09-09
- 发明人: Maneesh Soni , Kanu Chadha , Manish Bhardwaj
- 申请人: Engim, Inc.
- 申请人地址: US MA Acton
- 专利权人: Engim, Inc.
- 当前专利权人: Engim, Inc.
- 当前专利权人地址: US MA Acton
- 主分类号: H04J011/00
- IPC分类号: H04J011/00 ; H04Q007/24
摘要:
Upon a triggering event, a delay chain shifts data out at a higher rate than incoming packets and a processor controls bypassing circuitry to reduce the latency of hardware implementations of, for example, 802.11a OFDM receivers, with long delay chains. The signal processing algorithms used to recover symbol timing need a large number of samples stored in a delay chain, often consisting of pipelined registers. Such a delay chain introduces a large lag between the time samples have been acquired by the data converters and the time they are processed. This delay makes it difficult for higher level network layer implementations to meet the deadlines of 802.11a WLAN protocol. The proposed scheme implements dynamic reduction in the depth of the delay chain once timing recovery has been performed. A multi-step scheme achieves exponential reduction in the number of elements in the delay chain in every step.
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