Invention Grant
US6075815A Symbol-energy-to-noise-density estimation in a QPSK modulated
communication system
失效
QPSK调制通信系统中的符号能量噪声密度估计
- Patent Title: Symbol-energy-to-noise-density estimation in a QPSK modulated communication system
- Patent Title (中): QPSK调制通信系统中的符号能量噪声密度估计
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Application No.: US931991Application Date: 1997-09-17
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Publication No.: US6075815APublication Date: 2000-06-13
- Inventor: Ashvin Chheda , Michael S. Feeney , Ahmad Jalali
- Applicant: Ashvin Chheda , Michael S. Feeney , Ahmad Jalali
- Applicant Address: TX Richardson
- Assignee: Nortel Networks Corporation
- Current Assignee: Nortel Networks Corporation
- Current Assignee Address: TX Richardson
- Main IPC: H04B7/005
- IPC: H04B7/005 ; H04B17/00
Abstract:
The process determines the I channel and Q channel components for each received soft value. The location of each soft value with respect to the fade line is determined using the I and Q channel components. These locations are averaged over a power control group duration to determine the noise density. The symbol energy is determined by subtracting the average perpendicular distance from the soft value point to the fade line from half the square of the average of the distance from the soft value point to the origin.
Public/Granted literature
- US4148461A Self-aligning scissor type jack Public/Granted day:1979-04-10
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