发明名称 |
Techniques and systems for communications based on time reversal pre-coding |
摘要 |
Techniques, apparatuses and systems for providing communications based on time reversal of a channel impulse response of a pulse in a transmission channel between a transmitter and a receiver to enhance reception and detection of a pulse at the receiver against various effects that can adversely affect and complicate the reception and detection of the pulse at the receiver. |
申请公布号 |
US8743976(B2) |
申请公布日期 |
2014.06.03 |
申请号 |
US201013142236 |
申请日期 |
2010.09.03 |
申请人 |
Ziva Corporation |
发明人 |
Smith David F.;Husain Anis |
分类号 |
H04L27/00 |
主分类号 |
H04L27/00 |
代理机构 |
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代理人 |
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主权项 |
1. A method comprising:
detecting at a base a channel impulse response, comprising copies of an impulse-pulse emitted by a remote target, modulated at a first carrier frequency, wherein each copy is received at a different time based on a length of a respective path traveled by the respective copy through a communication channel; obtaining at the base the channel impulse response modulated at an intermediate frequency by combining the detected channel impulse response modulated at the first carrier frequency with a signal generated at the base and having a first frequency, wherein the intermediate frequency is a difference between the first carrier frequency and the first frequency; digitizing at the base the obtained channel impulse response modulated at the intermediate frequency into a channel impulse response waveform; storing at the base the channel impulse response waveform; performing a time-reversal operation on the stored channel impulse response waveform, wherein the time-reversal operation includes adding a time delay, which is determined based on both a time to receive the channel impulse response waveform at the base from the remote target and a time to reverse in the time domain the stored channel impulse response waveform; preparing a data signal comprising a copy of the time reversed channel impulse response waveform corresponding to each bit of a data stream that comprises information to be provided to the remote target; modulating the prepared data signal at a transmission frequency; and transmitting the modulated data signal from the base to the remote target.
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地址 |
San Diego CA US |