CDMA adaptive antenna receiving apparatus and communication system

Claim 2

A receiving apparatus for receiving a desired signal by synthesizing a plural of desired signal components incoming at a plural of different timings and from a plural of different directions at each timing while eliminating interference signals, which comprises: a plural of receivers (3-1 to 3-M) of which each receives one or more of said desired signal components incoming from different directions at the same time, wherein each of said plural of receivers (3-1 to 3-M) comprises a plural of adaptive receiving units (6-1 to 6-L) of which each updates a directivity thereof so as to match with an incoming direction of one of said desired signal components incoming from different directions at the same time.

Claim 3

The receiving apparatus according to claim 2, wherein said plural of adaptive receiving units (6-1 to 6-L) included in the same receiver (3-1 to 3-M) employ a symbol decision error of said same receiver (3-1 to 3-M) in common.

Claim 4

The receiving apparatus according to claim 2 or 3, wherein each said receiver (3-1 to 3-M) further comprises: a means (95, 96) for detecting a plural of sections containing said incoming directions of said plural of desired signal components; and a control means (94) for controlling directivities of said plural of adaptive receiving units (6-1 to 6-L) in accordance with said detected sections containing said incoming directions of said plural of desired signal components and said directivities of said plural of adaptive receiving units (6-1 to 6-L).

Claim 5

The receiving apparatus according to claim 4, wherein in case of directivities of all the working adaptive receiving units (6-1 to 6-L) being not contained within one of said plural of sections containing said incoming directions, said control means (94) adds another adaptive receiving unit (6-1 to 6-L) having a directivity to be included within the section concerned.

Claim 6

The receiving apparatus according to claim 4, wherein in case of directivities of a plural of working adaptive receiving units (6-1 to 6-L) being contained within one of said plural of said sections including said incoming directions, said control means (94) halts operations of adaptive receiving units (6-1 to 6-L) other than that having relatively higher reception accuracy among said plural of said working adaptive receiving units (6-1 to 6-L).

Claim 7

The receiving apparatus according to claim 4, wherein said control means (94) halts operations of adaptive receiving units (6-1 to 6-L) having directivities not contained within any of said plural of said sections containing said incoming directions.

Claim 8

The receiving apparatus according to claim 4, wherein said control means (94) sets a directivities representing said plural of said sections including said incoming directions as directivities for said plural of said adaptive receiving units (6-1 to 6-L) at the beginning of operation of said apparatus.

Claim 9

The receiving apparatus according to claim 4, wherein in case of an instantaneous disconnection occurred, said control means (94) sets directivities of said plural of adaptive receiving units (6-1 to 6-L) of at the time before said instantaneous disconnection as directivities for said plural of adaptive receiving units (6-1 to 6-L) of at the time after said instantaneous disconnection.

Claim 10

A receiving apparatus for receiving a desired signal by synthesizing a plural of desired signal components incoming at a plural of different timings and from a plural of different directions at each timing while eliminating interference signals, which comprises: a plural of receivers (3-1 to 3-M) of which each receives one of said desired signal components incoming from different directions at the same time, wherein each of said plural of receivers (3-1 to 3-M) comprises: an adaptive receiving unit (6-1 to 6-L) which updates a directivity thereof so as to match with any one of incoming directions of said plural of desired signal components; a means (95, 96) for detecting a plural of sections containing said incoming directions of said plural of desired signal components; and a control means (94) for controlling the directivity of said adaptive receiving unit (6-1 to 6-L) in accordance with said detected sections containing said incoming directions of said plural of desired signal components and the directivity of said adaptive receiving unit (6-1 to 6-L).

Claim 11

The receiving apparatus according to claim 10, wherein in case of said directivity of said adaptive receiving unit (6-1 to 6-L) being not contained within a section capable of obtaining desired signal components with relatively higher levels among said plural of sections including said incoming directions, said control means (94) sets a directivity representing the section concerned as the directivity of said adaptive receiving unit (6-1 to 6-L).

Claim 12

The receiving apparatus according to claim 10, wherein said control means (94) sets a directivity representing a section capable of obtaining desired signal components with relatively higher levels among said plural of sections containing said incoming directions as the directivity for said adaptive receiving unit (6-1 to 6-L) at the beginning of operation of said apparatus.

Claim 13

The receiving apparatus according to claim 10, wherein in case of an instantaneous disconnection occurred, said control means (94) sets a directivity of said adaptive receiving unit (6-1 to 6-L) of at the time before said instantaneous disconnection as a directivity for said adaptive receiving unit (6-1 to 6-L) of at the time after said instantaneous disconnection.

Claim 14

A CDMA adaptive antenna receiving apparatus which comprises: a plural of antennas (1-1 to 1-N); a plural of delay circuits (2-2 to 2-M) of which each delays a plural of signals received at said plural of antennas(1-1 to 1-N) by a certain time period in accordance with a time delay of a desired signal; a plural of adaptive receiving means (31-1 to 31-M) of which each receives an output of said delay circuit (2-2 to 2-M) with antenna beams, each said antenna beam being adaptive to an output of said delay circuit (2-2 to 2-M) and independent from the other antenna beams; a plural of reception weight control means (32-1 to 32-M) of which each controls reception weight vectors of each of said adaptive receiving means (31-1 to 31-M) so that each of said adaptive receiving means (31-1 to 31-M) receives desired signal components incoming from different directions at the same time by means of the antenna beams formed with the reception weight vectors; a first adder (4) for synthesizing outputs from said plural of adaptive receiving means (31-1 to 31-M); and a decision device (5) for performing symbol decision for an output of said first adder (4), said decision device (5) feeding a decided symbol therefrom to said plural of adaptive receiving means (31-1 to 31-M).

Claim 15

The CDMA adaptive antenna receiving apparatus according to claim 14, wherein said adaptive receiving means (31-1 to 31-M) comprises: a plural of adaptive receiving units (6-1 to 6-L) each comprising the antenna beam; a second adder (7) for summing outputs of said plural of adaptive receiving units (6-1 to 6-L); and a subtracter (8) for subtracting an output of said second adder (7) from said decided symbol, said subtracter (8) feeding a difference therefrom to said plural of adaptive receiving means (6-1 to 6-L), wherein the antenna beam in each of adaptive receiving units (6-1 to 6-L) receives each of desired signal components coming from different directions at the same time.

Claim 16

The CDMA adaptive antenna receiving apparatus according to claim 15, wherein each said plural of adaptive receiving means (6-1 to 6-L) comprises: a plural of despread means (61-1-1 to 61-L-N) corresponding to a plural of signals received at antennas (1-1 to 1-N); a plural of first multipliers (62-1-1 to 62-L-N) for weighting outputs of said despread means (61-1-1 to 61-L-N) by the reception weight vector; a third adder (63-1 to 63-L) for synthesizing outputs of said plural of first multipliers (62-1-1 to 62-L-N); a detector (65-1 to 65-L, 66-1 to 66-L, 67-1 to 67-L) for demodulating an output of said third adder; a second multiplier (68-1 to 68-L) for multiplying an output of said subtracter (8) by a communication channel distortion output from said detector (65-1 to 65-L, 66-1 to 66-L, 67-1 to 67-L); and an adaptive update means (69-1 to 69-L) for computing the reception weight vector adaptively based on an output of said second multiplier (68-1 to 68-L) and signals output from a plural of said despread means (61-1-1 to 61-L-N) and delayed, wherein the reception weight vector of said adaptive receiving unit (6-1 to 6-L) is controlled independently from the reception weight vectors of the other adaptive receiving units (6-1 to 6-L).

Claim 17

The CDMA adaptive antenna receiving apparatus according to claim 16, wherein said adaptive update means (69-1 to 69-L) controls said reception weight vector by means of a least mean square error control using a common symbol decision error output from said subtracter (8).

Claim 18

The CDMA adaptive antenna receiving apparatus according to claim 16, wherein said detector (65-1 to 65-L, 66-1 to 66-L, 67-1 to 67-L) comprises: a communication channel estimating means (67-1 to 67-L) for estimating said communication channel distortion based on the output of said third adder (63-1 to 63-L); a complex conjugate generating means (66-1 to 66-L) for generating a complex conjugate number of said communication channel distortion; and a third multiplier (65-1 to 65-L) for multiplying the output of said third adder (63-1 to 63-L) by the complex conjugate number.

Claim 19

The CDMA adaptive antenna receiving apparatus according to claim 15, wherein said reception weight control means (32-1 to 32-M) comprises: a plural of despread means (91-1 to 91-N) corresponding to a plural of signals received at antennas (1-1 to 1-N); a multi-beam forming means (92) for performing a plural of weight synthesis different from one another for outputs of said plural of said despread means (91-1 to 91-N) so as to form a multi-beam for a plural of different incoming directions, said multi-beam forming means (92) generating signals received by each beam of said multi-beam; a beam selecting means (93) for selecting one or more beams having desired signals of higher levels among outputs of said multi-beam forming means (92), said beam selecting means (93) generating the reception weight vectors and incoming directions corresponding to said selected beams; an incoming direction estimating means (96) for estimating incoming directions of desired signal components by using adaptive reception weight vectors (6-1-b to 6-L-b) computed at said adaptive receiving means (31-1 to 31-M); a comparing means (95) for comparing said estimated incoming directions of said desired signal components with said incoming directions of said selected beams; and a selecting means (94) for selecting said reception weight vectors of said selected beams or said adaptive reception weight vectors (6-1-b to 6-L-b) based on outputs of said comparing means (95), said selecting means (94) feeding outputs therefrom as selected reception weight vectors (6-1-a to 6-L-a) to said adaptive receiving means (31-1 to 31-M).

Claim 20

The CDMA adaptive antenna receiving apparatus according to claim 19, wherein said comparing means (95) compares said incoming directions of said selected beams with said estimated incoming directions of said desired signal components in a certain cycle, wherein in case of said estimated incoming direction of said desired signal component corresponding to said incoming direction of said selected beam being not present, said selecting means (94) provides said reception weight vector of said selected beam as an initial value of a reception weight vector for said adaptive receiving unit (6-1 to 6-L) to be newly added, whereby a new adaptive receiving operation is started for said incoming direction of said selected beam.

Claim 21

The CDMA adaptive antenna receiving apparatus according to claim 19, wherein said comparing means (95) compares said incoming directions of said selected beams with said estimated incoming directions of said desired signal components in a certain cycle, wherein in case of two or more of said estimated incoming directions of said desired signal components corresponding to a certain one of said incoming directions of said selected beams being present, said selecting means (94) provides one adaptive reception weight vector (6-1-b to 6-L-b) controlled in the highest accuracy among said two or more of adaptive reception weight vectors (6-1-b to 6-L-b) as an selected weight vector (6-1-a to 6-L-a) for one adaptive receiving unit (6-1 to 6-L) to be operated continuously, whereby an operation of said one of said adaptive receiving units (6-1 to 6-L) for said certain one incoming direction of said selected beam is continued, and operations of the others of said adaptive receiving units (6-1 to 6-L) for said certain one incoming direction of said selected are halted.

Claim 22

The CDMA adaptive antenna receiving apparatus according to claim 19, wherein said comparing means (95) compares said incoming directions of said selected beams with said estimated incoming directions of said desired signal components in a certain cycle, wherein in case of said incoming direction of said selected beam corresponding to said estimated incoming direction of said desired signal component for one adaptive receiving unit (6-1 to 6-L) being not present, said selecting means (94) halts feeding a selected reception weight vector (6-1-a to 6-L-a) to said adaptive receiving unit (6-1 to 6-L), whereby operation of said adaptive receiving unit (6-1 to 6-L) for said estimated incoming direction is halted.

Claim 23

The CDMA adaptive antenna receiving apparatus according to claim 19, wherein in case of, before an initial communication, said estimated incoming directions of said desired signal components being not in said comparing means (95), and the inputs of said adaptive reception weight vectors (6-1-b to 6-L-b) being not present in said selecting means (94), said selecting means (94) selects and sends all said reception weight vectors of said selected beams to said adaptive receiving units (6-1 to 6-L) as initial values of selected reception weight vectors (6-1-a to 6-L-a), whereby new adaptive receiving operations for all said directions of said selected beams are performed.

Claim 24

The CDMA adaptive antenna receiving apparatus according to claim 19, wherein in case of re-starting a communication after a certain short time period from the termination of the previous communication, said comparing means (95) employs said estimated directions of said desired signal components of at the time of said termination of said previous communication as inputs thereof, and said selecting means (94) employs said adaptive reception weight vectors (6-1-b to 6-L-b) of at the time of said termination of said previous communication as inputs thereof.

Claim 25

A communication system including a base station and mobile stations, wherein said CDMA adaptive antenna receiving apparatus according to claim 1 is used as said base station or said mobile stations.

Claim 26

A communication system including a base station and mobile stations, wherein said receiving apparatus according to any one of claims 2-9 is used as said base station or said mobile stations.

Claim 27

A communication system including a base station and mobile stations, wherein said receiving apparatus according to any one of claims 10-13 is used as said base station or said mobile stations.

Claim 28

A communication system including a base station and mobile stations, wherein said CDMA adaptive antenna receiving apparatus according to any one of claims 14-24 is used as said base station or said mobile stations.

Claim 29

A CDMA adaptive antenna receiving method comprising the steps of: receiving a plural of desired signal components incoming at a plural of different timings and from a plural of different directions at each timing at a plural of antenna beams, each of said antenna beams being formed adaptively to each incoming timing and each incoming direction; and obtaining a desired signal by synthesizing said plural of desired signal components received at said plural of different antenna beams.