发明授权
US07286603B2 Method and apparatus for increasing data rates in a wideband MC-CDMA telecommunication system
失效
用于在宽带MC-CDMA电信系统中增加数据速率的方法和装置
- 专利标题: Method and apparatus for increasing data rates in a wideband MC-CDMA telecommunication system
- 专利标题(中): 用于在宽带MC-CDMA电信系统中增加数据速率的方法和装置
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申请号: US10427694申请日: 2003-05-01
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公开(公告)号: US07286603B2公开(公告)日: 2007-10-23
- 发明人: Prabodh Varshney , Hannu Vilpponen , Mohammad J. Borran
- 申请人: Prabodh Varshney , Hannu Vilpponen , Mohammad J. Borran
- 申请人地址: FI Espoo
- 专利权人: Nokia Corporation
- 当前专利权人: Nokia Corporation
- 当前专利权人地址: FI Espoo
- 代理机构: Alston & Bird LLP
- 主分类号: H04L27/28
- IPC分类号: H04L27/28
摘要:
A system and method for the efficient transmission of information in a code division multiple access (CDMA) wireless telecommunication system. To increase the rate of reliable transmission, an orthogonal frequency-division multiplexing (OFDM) scheme is implemented in a direct-spread CDMA network, this combination sometimes being referred to as multi-carrier CDMA (MC-CDMA). Information (such as voice and data), interspersed with a known pilot signal, is encoded and spread across the frequency domain, rather than the time domain as in traditional CDMA; the allowable transmission bandwidth is divided into a number of carriers. To achieve even larger transmission rates, the guardband between carriers is eliminated. To prevent interference, the number of pilot transmissions is reduced and a corresponding number of frequency bins at the border of an OFDM block are loaded with zeros. The receiver simply ignores these subcarriers when reconstructing the transmitted signal.
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