Method and apparatus for measuring the impulse response of a radio channel
First Claim
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1. A system for measuring an impulse response of a radio channel, comprising:
- (a) transmitter means for transmitting a pseudo-random signal across a radio channel;
(b) receiver means for receiving the transmitted pseudo-random signal;
(c) mixing means for down-converting the received pseudo-random signal to an intermediate frequency signal;
(d) digital sampling means, coupled to the mixing means, for digitally sampling the intermediate frequency signal; and
(e) processing means, coupled to the digital sampling means, for cross-correlating the digitally sampled intermediate frequency signal with a digital representation of the transmitted pseudo-random signal to determine the impulse response of the radio channel.
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Abstract
A system for measuring a multipath radio channel impulse response by cross-correlating digital samples of a received pseudo-random signal with a digital copy of the transmitted signal. A transmitter within the system repeatedly transmits the pseudo-random signal across a multipath radio channel. A receiver within the system receives the transmitted signal, as well as delayed versions of the original signal, and digitally samples the received signals. A computer then cross-correlates the samples of the received signal with the digital stored version of the transmitted signal to produce a measure of the impulse response of the multipath radio channel.
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Citations
17 Claims
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1. A system for measuring an impulse response of a radio channel, comprising:
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(a) transmitter means for transmitting a pseudo-random signal across a radio channel; (b) receiver means for receiving the transmitted pseudo-random signal; (c) mixing means for down-converting the received pseudo-random signal to an intermediate frequency signal; (d) digital sampling means, coupled to the mixing means, for digitally sampling the intermediate frequency signal; and (e) processing means, coupled to the digital sampling means, for cross-correlating the digitally sampled intermediate frequency signal with a digital representation of the transmitted pseudo-random signal to determine the impulse response of the radio channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for measuring an impulse response of a radio channel, comprising the steps of:
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(a) transmitting a pseudo-random signal across a radio channel; (b) receiving the transmitted pseudo-random signal; (c) down-converting the received pseudo-random signal to an intermediate frequency signal; (d) digitally sampling the intermediate frequency signal; and (e) cross-correlation the digitally sampled intermediate frequency signal with a digital representation of the transmitted pseudo-random signal to determine the impulse response of the radio channel. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification