发明名称 |
System and method for measuring channel quality information in a communication system |
摘要 |
A system and method to measure channel quality in terms of signal to interference plus noise ratio for the transmission of coded signals over fading channels in a communication system. A Viterbi decoder metric for the Maximum Likelihood path is used as a channel quality measure for coherent and non-coherent transmission schemes. This Euclidean distance metric is filtered in order to smooth out short term variations. The filtered or averaged metric is a reliable channel quality measure which remains consistent across different coded modulation schemes speeds. The filtered metric is mapped to the signal to interference plus noise ratio per symbol using a threshold based scheme. Use of this implicit signal to interference plus noise ratio estimate is used for the mobile assisted handoff in a cellular system, power control and data rate adaptation in the transmitter.
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申请公布号 |
US6215827(B1) |
申请公布日期 |
2001.04.10 |
申请号 |
US19980044636 |
申请日期 |
1998.03.19 |
申请人 |
LUCENT TECHNOLOGIES, INC. |
发明人 |
BALACHANDRAN KRISHNA;NANDA SANJIV;KADABA SRINIVAS R.;EJZAK RICHARD P. |
分类号 |
H04B17/00;H03M13/23;H04B1/10;H04B7/26;H04L1/00;H04L1/12;H04L1/20;H04L27/00;H04L27/18;H04L27/34;H04W36/30;H04W72/08;(IPC1-7):H04L23/02 |
主分类号 |
H04B17/00 |
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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