发明名称 |
Method and apparatus for encoding compressible data for transmission over variable quality communication channel |
摘要 |
A multi-carrier communication system ( 400 ) groups subchannels ( 802 ) into different quality-of-signal (QoS) regions ( 804 ). An unconstrained optimization process ( 1200 ) is performed independently for the subchannels ( 802 ) of the different QoS regions ( 804 ) to allocate bit rates and power to the individual subchannels ( 802 ) so that the indicated QoS will result. Coders ( 504, 508, 512, 516, 1700 ) partition and error-correction encode source information using encoding schemes matched to the different QoS regions ( 804 ). A set ( 1100 ) of only a few directed QoS partition vectors ( 1102 ) direct the unconstrained optimization process ( 1200 ) to attempt bit-rate and power allocations on only a few promising groupings of subchannels ( 802 ) and QoS regions ( 804 ). An iterative process may take place between bit-rate and power allocation on one side and source information coding on the other for different directed QoS partition vectors ( 1102 ) to identify the best solution. A coder ( 1700 ) may use a dual allocation process ( 1800 ) to iteratively combine a rate-allocation process ( 1724 ) with a QoS-region-allocation process ( 1726 ) to specify codebooks ( 1720 ) for use by a codebook quantizer ( 1718 ).
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申请公布号 |
US7339881(B1) |
申请公布日期 |
2008.03.04 |
申请号 |
US20030437422 |
申请日期 |
2003.05.12 |
申请人 |
GENERAL DYNAMICS C4 SYSTEMS, INC. |
发明人 |
ABOUSLEMAN GLEN PATRICK;KLEIDER JOHN ERIC;FETTE BRUCE ALAN |
分类号 |
H04J99/00;H04J1/00;H04J3/16;H04J3/22;H04K1/02;H04K1/10;H04L27/28 |
主分类号 |
H04J99/00 |
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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