US6128486A — Reception method and base station receiver

Claim 1

Independent Claim 124 words

A reception method in a CDMA cellular radio system, comprising: in each cell, at least one base station communicating with a plurality of mobile stations located within its area, said base station measuring a direction angle of a signal arriving from each said mobile station to said base station, said base station transmitting and receiving signals of said mobile stations by an antenna array by phasing a signal to be transmitted and received so that a gain obtained from said antenna array is largest in a desired direction, said antenna array comprising several elements, wherein detection of a desired signal uses simultaneously, signals received from said plurality of mobile stations, an incoming direction of said signals being taken into account when selecting said signals.

Claim 2

Dependent Claim 124 words

A reception method in a CDMA cellular radio system, comprising: in each cell, at least one base station communicating with a plurality of mobile stations located within its area, said base station measuring a direction angle of a signal arriving from each said mobile station to said base station, said base station transmitting and receiving signals of said mobile stations by an antenna array by phasing a signal to be transmitted and received so that a gain obtained from said antenna array is largest in a desired direction, said antenna array comprising several elements, wherein detection of a desired signal uses simultaneously, signals received from said plurality of mobile stations, an incoming direction of said signals being taken into account when selecting said signals.

Claim 3

Dependent Claim 26 words

The method according to claim 1, wherein detection of said desired signal uses simultaneously, significant signals that arrive from the same direction as said desired signal.

Claim 4

Dependent Claim 68 words

The method according to claim 1, wherein said base station removes signal components interfering with said desired signal from a received transmission, when interfering signals are being removed from each said desired signal, said incoming direction and strength of said interfering signals are taken into account, and that significant signals which arrive from said same direction as said desired signal, are selected for removal from said desired signal.

Claim 5

Dependent Claim 34 words

The method according to claim 3, wherein interference cancellation of said signal received from said mobile station uses signals that have been received from said other mobile stations and that have already been detected.

Claim 6

Dependent Claim 117 words

The method according to claim 3, wherein said mobile stations measure a quality of a signal received from their own base station and from surrounding base stations, and report measurement results via their own base station to a base station controller, said base station controller detects, based on said measurement results, when interference caused by transmission from a particular mobile station of said surrounding base stations exceeds a given threshold, and when measurement of said interfering channel is started in said surrounding base stations, and said base station controller informs said base station surrounding said desired signal of parameters concerning said interfering signal, said base station activates a receiver to indicate said interfering signal for interference cancellation.

Claim 7

Dependent Claim 69 words

The method according to claim 3, wherein received radio-frequency signals are converted into an intermediate frequency, at least one interfering signal arriving from said direction of said desired signals is detected from said signal, and said at least one interfering signal is combined, modulated, and weighted with directional and weighting coefficients and supplied to said desired signal detector where interference cancellation is performed before said desired signal is detected.

Claim 8

Dependent Claim 176 words

A base station receiver, comprising: an antenna array comprising several elements; a plurality of radio-frequency units connected to said antenna array; a plurality of detectors, said detectors comprising a plurality of filters and a plurality of signal detectors adapted to a signal to be received; a phaser which phases said received signal so that a gain obtained from said antenna array is largest in said desired direction; a first detector which performs preliminary estimation on received signal components, an input to said first detector being a signal from said radio-frequency units; a switching matrix, an input to said switching matrix being a signal from said first detector, a second detector which performs signal detection and estimation by using a plurality of signal components received from different terminal equipment, an input to said second detector being a signal from said radio-frequency units and output signal of said switching matrix; and a controller which selects and guides, by said switching matrix, signals to be used based on their incoming direction from said first detector to said second detector.

Claim 9

Dependent Claim 176 words

A base station receiver, comprising: an antenna array comprising several elements; a plurality of radio-frequency units connected to said antenna array; a plurality of detectors, said detectors comprising a plurality of filters and a plurality of signal detectors adapted to a signal to be received; a phaser which phases said received signal so that a gain obtained from said antenna array is largest in said desired direction; a first detector which performs preliminary estimation on received signal components, an input to said first detector being a signal from said radio-frequency units; a switching matrix, an input to said switching matrix being a signal from said first detector, a second detector which performs signal detection and estimation by using a plurality of signal components received from different terminal equipment, an input to said second detector being a signal from said radio-frequency units and output signal of said switching matrix; and a controller which selects and guides, by said switching matrix, signals to be used based on their incoming direction from said first detector to said second detector.

Claim 10

Dependent Claim 45 words

The base station receiver according to claim 7, further comprising: an estimator which removes interfering signals from said desired signal and estimates, and a controller which guides, by said switching matrix, said interfering signals to be removed from said first detector to said second detector.

Claim 11

Dependent Claim 71 words

The base station receiver according to claim 8, wherein said second detector comprises at least one remover which removes a signal interfering with said desired signal from said received signal, at least one phaser which phases said received signal so that said gain obtained from said antenna array is largest in said desired direction, at least one demodulator which demodulates said desired signal, and a combiner which combines said demodulated signals.

Claim 12

Dependent Claim 46 words

The base station receiver according to claim 9, wherein said second detector comprises at least one calculator which calculates a direction where said gain obtained from said antenna array is largest, and a transmitter which transmits information about said direction to said phaser and said controller.

Claim 13

Dependent Claim 87 words

The base station receiver according to claim 7, wherein said first detector comprises at least one phaser which phases said received signal under control of said controller or said second detector so that said gain from said antenna array is largest in said desired directions, at least one demodulator which demodulates said signal, a combiner which combines said demodulated signals, a modulator which modulates said combined signal back to broadband, and a weighting phaser which weights and phases said modulated signal to correspond to said received signal.

Claim 14

Dependent Claim 96 words

The base station receiver according to claim 8, further comprising: a phaser connected to said antenna array which analogically phases said received signal so that said gain obtained from said antenna array is largest in said desired beam-like directions, and that said second detector comprises at least one remover which removes said signal interfering with said desired signal from said received signal, at least one demodulator which demodulates said desired signal, at least one switch which connects said received signals with said desired antenna beams to said demodulator, and a combiner which combines said demodulated signals.

Claim 15

Dependent Claim 26 words

The base station receiver according to claim 12, wherein said second detector comprises at least one controller which controls said switch based on said received signal.

Claim 16

Dependent Claim 42 words

The base station receiver according to claim 7, further comprising: a detector which simultaneously detects a plurality of signals arriving from the same direction; and a controller which guides, by said switching matrix, signals to be detected simultaneously to said second detector.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2003-10-03	2004-04-03	2004-10-03	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2007-10-03	2008-04-03	2008-10-03	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2011-10-03	2012-04-03	2012-10-03	$7700.00	Window Closed / Lapsed

Reception method and base station receiver

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