发明申请
US20110090948A1 ADAPTIVE QAM TRANSMISSION SCHEME TO IMPROVE PERFORMANCE ON AN AWGN CHANNEL
有权
自适应QAM传输方案提高AWGN频道的性能
- 专利标题： ADAPTIVE QAM TRANSMISSION SCHEME TO IMPROVE PERFORMANCE ON AN AWGN CHANNEL
- 专利标题（中）： 自适应QAM传输方案提高AWGN频道的性能
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申请号： US12737094申请日： 2009-05-22
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公开(公告)号： US20110090948A1公开(公告)日： 2011-04-21
- 发明人: Wei Zhou , Li Zou
- 申请人： Wei Zhou , Li Zou
- 优先权： EP08305257.1 20080613
- 国际申请： PCT/IB2009/005684 WO 20090522
- 主分类号： H04N11/02
- IPC分类号： H04N11/02 ; G06F11/00 ; H03M13/00
摘要：
A cable transmitter supports a number of low density parity check (LDPC) coding rates, e.g., 1/4, 1/3, 2/5, 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9 and 9/10; and supports a number of quadrature amplitude modulation (QAM) schemes, e.g., 4-QAM, 16-QAM, 64-QAM, 256-QAM, 1024-QAM or higher. For a selected modulation scheme, the cable transmitter selects between using a non-uniform symbol constellation or a uniform symbol constellation as a function of a selected coding rate.
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