Method, apparatus and system for multiple signal transmission, reception, and restoration
First Claim
1. A communication system for simultaneous transmission, reception and restoration of a plurality of individual signals superimposed in space and frequency, comprising a plurality of collocated transmitter antennas transmitting signals which reuse a common frequency band, a plurality of collocated receiver antennas receiving signals which reuse a common frequency band, a set of filters, having at least one filter, which is used to process the said received or transmitted signals, and at least one summing node which sums the signals produced by the said filters restoring at least one original individual signal and reducing the interference resulting from simultaneous transmission of a plurality of signals.
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Abstract
Techniques for increasing the capacity of a radio link, using radio signal superimposing in space and frequency and subsequent signal restoration, are described. Each of the transmitting and receiving systems are connected to a plurality of collocated antennas. The signals that are superimposed are recovered by one or a plurality of restorers. The disclosed method of signal processing involves appropriate filtering of signals, then summing them in order to restore the original individual signals and to cancel out all undesired signals received as a result of superimposing. Preferably, the spacing between antennas is optimized so that while the undesired signals are minimized or canceled out, the restored signals are maximized. In simple situations, signal filtering may be reduced to phase adjustment of the signals and the restoration may be done at RF, IF or baseband. In more complex situations, general adaptive filters implemented in baseband may be preferred. Various embodiments of the restorer are presented.
62 Citations
36 Claims
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1. A communication system for simultaneous transmission, reception and restoration of a plurality of individual signals superimposed in space and frequency, comprising
a plurality of collocated transmitter antennas transmitting signals which reuse a common frequency band, a plurality of collocated receiver antennas receiving signals which reuse a common frequency band, a set of filters, having at least one filter, which is used to process the said received or transmitted signals, and at least one summing node which sums the signals produced by the said filters restoring at least one original individual signal and reducing the interference resulting from simultaneous transmission of a plurality of signals.
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18. A method for simultaneous transmission, reception and restoration of a plurality of individual signals superimposed in space and frequency, comprising
transmitting and receiving a plurality of signals where the transmitting antennas are collocated and the receiving antennas are collocated and the said antennas reuse a common frequency band, applying a set of filters, containing at least one filter, to the said received or transmitted signals, and summing the signals processed by the said filters restoring at least one original signal and reducing the interference resulting from the simultaneous transmission of a plurality of signals.
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29. A restorer apparatus for use in a system utilizing simultaneous transmission of multiple radio signals superimposed in space and frequency, comprising
interface means to a plurality of collocated receiver antennas processing signals which reuse a common frequency band, a set of filters, consisting of at least one filter, which is used to filter the said received signals, and at least one summing node which sums the signals produced by said filters restoring at least one original individual signal and reducing the interference resulting from simultaneous transmission of a plurality of signals.
Specification