发明名称 |
Method and apparatus for quadrature multi-pulse modulation of data for spectrally efficient communication |
摘要 |
A modulator produces a modulated signal including a carrier and data signals representing data bits. The data signals include at least two in-phase modulating pulses which have different shapes and which are interfering in time and frequency; the data signals further include at least two quadrature modulating pulses which have different shapes and which are interfering in time and frequency. The modulator includes a filter for producing each shape of pulse, and combining circuits for combining the pulses with each other and with a carrier. The demodulator (or receiver) receives the combined signal and separates the pulses from the carrier. The demodulator further includes filters for separating the pulses, and a circuit for processing the pulses to reproduce the data bits. The processing circuit preferably includes one or more maximum likelihood sequence estimation equalizers.
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申请公布号 |
US6608874(B1) |
申请公布日期 |
2003.08.19 |
申请号 |
US19980005469 |
申请日期 |
1998.01.12 |
申请人 |
HUGHES ELECTRONICS CORPORATION |
发明人 |
BEIDAS BASSEL F.;HAMMONS, JR. A. ROGER |
分类号 |
H03K7/02;H04L25/03;H04L27/18;(IPC1-7):H03K7/02 |
主分类号 |
H03K7/02 |
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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