CN1176544A

CN1176544A - Diversity receiver

Info

Publication number: CN1176544A
Application number: CN 97117872
Authority: CN
Inventors: 中村大志
Original assignee: NEC Corp
Current assignee: NEC Corp
Priority date: 1996-07-16
Filing date: 1997-07-16
Publication date: 1998-03-18
Also published as: JPH1032529A; AU740400B2; AU2869097A; SG67402A1

Abstract

The diversity receiver is provided with a plurality of receivers each having a unique reception antenna and a maximum reception electric field strength index voltage selection circuit that selects and outputs one maximum reception electric field strength index voltage among the received electric field strength index voltages obtained by the receivers. Then the diversity receiver allows a reception electric field strength processing circuit to process information of an antenna reception electric field based on the maximum reception electric field strength index voltage from the maximum reception electric field strength index voltage selection circuit.

Description

Diversity receiver

The present invention relates to a kind of diversity receiver, relate in particular to the diversity receiver that obtains the antenna receiving signal strength information according to a RSSI voltage of from some received signal intensity indication (RSSI) voltages, selecting.

Conventional diversity receiver comprises a plurality of receivers, wherein each receiver is provided with a reception antenna, each receiver is used to export received signal intensity indication (hereinafter being referred to as ' RSSI ') voltage, be used to keep the peak holding circuit of each RSSI voltage, the mould of output that is used for the digital translation peak holding circuit is with to digital quantizer (hereinafter being referred to as " A/D converter ") be used for the comparator of comparison RSSI voltage.Each receiver is also exported the antenna input system signal as the receiver data.The output of A/D converter is imported into main circuit,, obtains the information of antenna receiving signal intensity according to these here.

At this diversity receiver, obtain the peak value retention value of RSSI voltage by receiver, be converted into digital signal by A/D converter, import this main circuit then, obtain the information of antenna receiving signal intensity here.On the other hand, comparator determines that by compare operation which RSSI voltage is bigger, and determines the information of output maximum antenna input system according to this.

Yet, in the diversity receiver of routine, have such problem, that is, peak holding circuit and A/D converter must handle from the RSSI voltage of each receiver output and only the RSSI voltage of a maximum as detecting data.Therefore, when the quantity of receiver is increased to greater than two, the quantity of have to further increase peak holding circuit and A/D converter.In other words, will strengthen integrated circuit, and integrated circuit becomes complicated and expensive thus.

Therefore, an object of the present invention is to provide a kind of diversity receiver that can effectively simplify its circuit formation.

According to the present invention, diversity receiver comprises:

A plurality of receivers, each receiver has a reception antenna;

Maximum received signal strength instructed voltage selector circuit is used to export the maximum received signal strength instructed voltage that the received signal intensity instructed voltage that obtains from a plurality of receivers is selected; With

Received signal strength information treatment circuit is used for according to the information of handling antenna receiving signal intensity from the maximum received signal strength instructed voltage of maximum received signal strength instructed voltage selector circuit input.

To explain the present invention in more detail in conjunction with the accompanying drawings, wherein:

Fig. 1 is the block diagram of the major part of the conventional diversity receiver of expression;

Fig. 2 represents the block diagram of diversity receiver major part according to the preferred embodiment of the invention;

Fig. 3 is the circuit diagram of the element of maximum RSSI selector circuit 109 in the presentation graphs 2;

Fig. 4 is the circuit diagram of the element of the maximum RSSI identification signal generation circuit 114 in the presentation graphs 2;

Fig. 5 is the identification signal A in the presentation graphs 4, the truth table of B;

Fig. 6 is that four end moulds in the presentation graphs 2 are with the circuit diagram of the element of switching circuit 115;

Fig. 7 be the expression be applicable to the diversity receiver among Fig. 2 another maximum RSSI selector circuit circuit diagram and

Fig. 8 is the block diagram that expression is applicable to another four ends analog switching circuit of the diversity receiver among Fig. 2.

Before the diversity receiver in explaining the preferred embodiments of the present invention, with the diversity receiver of the above-mentioned routine in the key-drawing 1.

Fig. 1 represents the major part of conventional diversity receiver, here 701 and 709 is to be respectively the reception antenna that receiver 702 and 710 provides, 703 and 711 is to indicate (hereinafter being referred to as ' RSSI ') voltage from the received signal intensity of receiver 702 and 710 outputs respectively, 704 and 712 is peak holding circuits of RSSI voltage, 705 and 713 is AD converters (hereinafter being referred to as ' A/D converter ') of the output of digital translation peak holding circuit 704 and 712, and 706 and 714 be the output of the A/D converter of input main circuit (not shown), obtains the information of antenna receiving signal intensity according to these outputs at main circuit.In addition, 707 and 715 is as the antenna input system signal that receives data, the 717th, and the comparator of comparison RSSI voltage, and 718 be the output of comparator 717.

Below, with the diversity receiver of the preferred embodiment of the present invention in the key-drawing 2.

At Fig. 2,101,102,103 and 104 is from having reception antenna 131 respectively, 132, four receivers 121 of 133 and 134,122,123 and the 124 RSSI voltages of exporting separately, 105,106,107 and 108 is the antenna input system signals as the radio-frequency (RF) data signal that receives from receiver 121 to 124, the 109th, select maximum RSSI (indication of the received signal intensity) selector circuit of the RSSI voltage of a maximum from RSSI voltage 101 to 104, the 111st, keeps the peak holding circuit of the peak value of maximum RSSI voltage, the 112nd, the A/D converter and 113 of digital translation peak value sustaining voltage is that 8 bit digital of maintenance antenna receiving signal strength information are exported.Received signal strength information treatment circuit 118 is by peak holding circuit 111, and the main circuit of A/D converter 112 and input aerial received signal strength information constitutes.

On the other hand, the 114th, according to the maximum RSSI identification signal generation circuit of discerning the digital signal of maximum antenna input system as the 3 bit signals output of the RSSI selection of exporting from maximum RSSI selector circuit 109.The 115th, according to the 2 bits output access of maximum RSSI identification signal generation circuit 114 and one of them four ends simulation switched circuit of output antenna input system signal 105 to 108 as maximum antenna input system signal 116.

Fig. 3 has represented maximum RSSI selector circuit 109 in detail.At this circuit, compare two RSSI voltages 101,102 by comparator 205, export a voltage that has big level between the RSSI voltage 101,102 selectively by switching-analog switch 208 according to this comparative result then.On the other hand, compare other two RSSI voltages 103,104, export a voltage that has big level between the RSSI voltage according to this comparative result selectively by switching an analog switch 209 then by comparator 206.

Then, compare through analog switch 208 by comparator 207, two RSSI voltages of 209 outputs, then according to this comparative result by switch an analog switch 210 export selectively have big level between two RSSI voltages a voltage as maximum RSSI voltage.At Fig. 3, a, b and c are the comparative result output (3 bit) from comparator 205,206 and 207.

Fig. 4 has represented maximum RSSI identification signal generation circuit 114 in detail.The 251st, import the NAND circuit that two comparative results are exported a and c, the 252nd, the inverter of anti-phase comparative result output c, the 253rd, the NAND circuit of input inversion output and comparative result output b, and 254 be between the output of NAND circuit 251,253, carry out with operate and circuit.With circuit 254 output-output A, inverter 252 output-output B.Fig. 5 is the output A to RSSI voltage, the truth table of B.

Fig. 6 represents the element of four ends simulations switched circuit 115, here according to output A, B by analog switch 271 select maximum between the antenna input system signals 105 to 108 one and with its output as maximum antenna input signal 116.

As mentioned above, in the diversity receiver of this embodiment, at first, maximum RSSI selector circuit 109 select maximum in four RSSI voltages outputs from receiver 121 to 124 one and with its output as maximum RSSI voltage 110.In detail, four RSSI voltage input comparators 205,206, pass through analog switch 208 according to comparative result then, 209 select bigger between them one and input comparator 207 once more, then according to comparative result by analog switch 210 select bigger one to export maximum RSSI voltage 110.That is to say, with match mode comparison RSSI voltage to obtain maximum RSSI voltage.

Then, resulting maximum RSSI voltage 110 is through peak holding circuit 111, and A/D converter 112 obtains the information of antenna receiving signal intensity here as 8 bit digital signal input main circuit 117 according to this digital signal.

On the other hand, at maximum RSSI identification signal generation circuit 114, the output a of maximum RSSI selector circuit 109 shown in Figure 3, the logical circuit that b and c (3 bit) input is shown in Figure 4, obtain 2 bit recognition data A corresponding to RSSI voltage shown in Figure 5 then, B.In addition, simulate switched circuit 115 as antenna input system signal 105 to 108 inputs four ends of radio-frequency (RF) data signal.At four ends simulation switched circuit 115, according to 2 bit recognition data A, B selects to output to the demodulator (not shown) as the maximum antenna input system signal 116 of one of maximum between the antenna input system signal 105 to 108 and with it, produces and export the reception data here.

Like this, by select maximum RSSI voltage as data from four RSSI voltages, can reduce the peak holding circuit that must provide and the quantity of A/D converter corresponding to the quantity routine of receiver.That is to say that it is necessary having only peak holding circuit 111 and A/D converter 113.Therefore, can reduce the quantity of parts, simplify entire circuit, reduce to the interface quantity of LSI and reduce manufacturing cost.

Simultaneously, as four ends simulation switched circuit 115, generally use double circuit type rather than single circuit type shown in Figure 6.In this case, maximum RSSI selector circuit 109A is used to the output a that provides shown in Figure 7, and b and c (3 bit) wherein omit the analog switch 210 of maximum RSSI selector circuit 109 shown in Figure 3.According to this output, maximum RSSI identification signal generation circuit 114 produces maximum RSSI identification signal A, B (2 bit).

On the other hand, according to maximum RSSI identification signal A, B, the maximum RSSI voltage 110 that the four ends simulation switched circuit 115A output with first analog switch 151 and second analog switch 152 shown in Figure 8 is selected from RSSI voltage 101 to 104 is also exported the maximum antenna input system signal of selecting from antenna input system signal 105 to 108 116.Like this, by using four ends simulation switched circuit 115A, so because RSSI voltage only needs an analog switch can save electric energy consumption.

Although according to certain embodiments has been fully and clearly openly to have described the present invention, but do not limit the appended claims thus, the appended claims can constitute and embody those skilled in the art whole modifications and interchangeable structure that can realize and that fall into its basic principle of stating fully.

Claims

1, a kind of diversity receiver comprises:

A plurality of receivers, each receiver have a reception antenna;

Maximum received signal strength instructed voltage selector circuit, the maximum received signal strength instructed voltage that the received signal intensity instructed voltage that this circuit output obtains from described a plurality of receivers is selected; With

Received signal strength information treatment circuit, this circuit is according to the information of handling antenna receiving signal intensity from the described maximum received signal strength instructed voltage of described maximum received signal strength instructed voltage selector circuit input.

2, diversity receiver according to claim 1, wherein:

Described maximum received signal strength instructed voltage selector circuit comprises a plurality of comparators, each comparator compares two described received signal intensity instructed voltage in the match mode, with a plurality of switches, each switch is exported bigger and finally export described maximum received signal strength instructed voltage by the compare operation of described match mode in described two received signal intensity instructed voltage according to the comparative result of described corresponding comparator.

3, diversity receiver according to claim 2 also comprises:

Maximum received signal strength instructed voltage identification signal generation circuit, this circuit produces the identification signal of described maximum received signal strength instructed voltage according to the output of the described comparator of described maximum received signal strength instructed voltage selector circuit; With

The simulation switched circuit, the maximum antenna input system signal that the antenna input system signal that this circuit receives from described reception antenna according to the described identification signal output that is produced by described maximum received signal strength instructed voltage identification signal generation circuit is selected.

4, diversity receiver according to claim 3, wherein:

Described simulation switched circuit comprises first analog switch, the described maximum received signal strength instructed voltage that this switch is selected from described a plurality of received signal intensity instructed voltage according to the described identification signal output that is produced by described maximum received signal strength instructed voltage identification signal generation circuit, with second analog switch, the described maximum antenna input system signal that this switch output is selected from described antenna input system signal.