发明名称 |
Low complexity adaptive equalizer radio receiver employing direct reference state updates |
摘要 |
A low complexity adaptive equalizer for use in U.S. digital cellular radios demodulates pi /4-shifted differentially encoded quadrature phase shift keyed (DQPSK) encoding in the presence of intersymbol interference (ISI) with reduced decoding complexity by employing an estimated received constellation which takes into account channel changes over time and ISI. The decoding complexity is reduced by tracking a reduced number of estimated reference symbol constellation points and taking advantage of the geometry to estimate the remaining symbol constellation points. Reference symbol constellation points are updated directly to compensate for changes in the channel, instead of determining channel impulse response (CIR) coefficients, and convolving the CIR coefficients with received symbols to determine new reference symbol constellation points.
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申请公布号 |
US5371471(A) |
申请公布日期 |
1994.12.06 |
申请号 |
US19930143011 |
申请日期 |
1993.10.29 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
CHENNAKESHU, SANDEEP;KOILPILLAI, RAVINDER D.;TOY, RAYMOND L. |
分类号 |
H04L25/02;H04L25/03;(IPC1-7):H04L27/12 |
主分类号 |
H04L25/02 |
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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