发明名称 |
Implementation of N-VSB training sequences in N-squared QAM receiver structures |
摘要 |
Training sequences designed for N-VSB systems within the embodiment of an N-squared QAM receiver facilitate designing 8-VSB receivers using methodologies of 64-QAM receiver design. A receiver designed using such methodologies converts the received modulation into a signal which can be accepted by circuitry for decoding 64 level quadrature-amplitude modulation (64-QAM) signals. This process provides a better signal to noise ratio reception than the conventional I-channel only decoding circuitry of most 8-VSB receivers. This process also employs training and equalizing algorithms developed for 64-QAM receivers which are superior to equivalent algorithms for 8-VSB receivers. The invention can be generalized to N-VSB conversion into M-QAM where M=N2. Adaptive equalization algorithms for 8-VSB transmissions implemented within the context of the 64 QAM receiver are superior to present single-channel VSP processing receivers. Present 64 QAM equalization strategies can be employed when receiving an 8-VSB waveform, given removal of the pilot tone and time offset, except when employing a training sequence. Modifications to the 8-VSB training sequence specification are employed for operation within a 64 QAM receiver design.
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申请公布号 |
US6459741(B1) |
申请公布日期 |
2002.10.01 |
申请号 |
US19990422450 |
申请日期 |
1999.10.21 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
GRABB MARK LEWIS;HERSHEY JOHN ERIK;WELLES, II KENNETH BRAKELEY |
分类号 |
H04L27/02;H04L27/34;H04N5/21;H04N5/44;H04N5/455;(IPC1-7):H04L5/12 |
主分类号 |
H04L27/02 |
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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