发明名称 |
Digital data demodulating apparatus |
摘要 |
In a digital data demodulating apparatus, a sampling circuit samples a received signal at a speed NxK (N>1, K>1; integers) times a symbol rate to output received signal sequences. N received signal sequence selection circuits estimate channel impulse responses from the respective received signal sequences to obtain channel state data, and output a control pulse and the estimated channel impulse response values. A received signal sequence selection controller outputs a switch control signal on the basis of the channel state data. N selectors select demodulation received signal sequence candidates from the received signal sequences on the basis of the control pulse. A first switch selects/outputs a received signal sequence to be demodulated on the basis of the switch control signal. A second switch selects/outputs an estimated channel impulse response value estimated from the received signal sequence to be demodulated on the basis of the switch control pulse. A demodulation circuit performs demodulation upon reception of the outputs from the first and second switches.
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申请公布号 |
US5479450(A) |
申请公布日期 |
1995.12.26 |
申请号 |
US19930172256 |
申请日期 |
1993.12.23 |
申请人 |
NEC CORPORATION |
发明人 |
OKANOUE, KAZUHIRO;USHIROKAWA, AKIHISA |
分类号 |
H04B14/04;H04L25/02;H04L25/03;H04L25/30;H04L27/00;(IPC1-7):H03D1/00;H04L27/06 |
主分类号 |
H04B14/04 |
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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