JPH058889B2 - - Google Patents
Info
- Publication number
- JPH058889B2 JPH058889B2 JP9625686A JP9625686A JPH058889B2 JP H058889 B2 JPH058889 B2 JP H058889B2 JP 9625686 A JP9625686 A JP 9625686A JP 9625686 A JP9625686 A JP 9625686A JP H058889 B2 JPH058889 B2 JP H058889B2
- Authority
- JP
- Japan
- Prior art keywords
- base station
- antenna
- land mobile
- circularly polarized
- polarization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000010295 mobile communication Methods 0.000 claims description 10
- 230000010287 polarization Effects 0.000 description 16
- 238000010586 diagram Methods 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005562 fading Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Mobile Radio Communication Systems (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は陸上移動通信システムに関し、特に交
信対象とする陸上移動局に携帯無線装置を含んだ
陸上移動通信システムに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a land mobile communication system, and more particularly to a land mobile communication system in which a land mobile station to be communicated with includes a portable radio device.
従来の陸上移動通信システムは、交信の対象と
なる陸上移動局が専ら車載用の移動無線装置であ
つて垂直偏波（直線偏波）が用いられ、陸上移動
局のアンテナは基地局のアンテナの偏波面と一致
するように車両に垂直に固定されている。近年
UHF帯の使用と無線装置の小型化技術の発達に
より、個人が容易に携行できる小形の携帯無線装
置が実現可能となるに伴い、陸上移動通信システ
ムの対称となる陸上移動局の範囲がこのような携
帯無線装置を含むものに拡がつている。
In conventional land mobile communication systems, the land mobile stations that communicate are exclusively vehicle-mounted mobile radio devices that use vertical polarization (linear polarization), and the antenna of the land mobile station is similar to that of the base station antenna. It is fixed vertically to the vehicle to match the plane of polarization. recent years
With the use of the UHF band and the development of miniaturization technology for wireless devices, it has become possible to realize small portable wireless devices that can be easily carried by individuals. This has expanded to include portable wireless devices.
こうのようなUHF帯の携帯無線装置の場合に
は、装置に取付けられているスリーブアンテナ等
の偏波面は、通話時および待受け時のいずれにお
いても基地局アンテナの偏波面と一致しない場合
が少なくない。すなわち、基地局アンテナの垂直
偏波に対して、片手で持つて手軽に扱えるハンデ
イ型の携帯無線装置では、通話時に傾斜して使用
されたり待受け時に水平に置かれたりすることが
避けられず、従つてアンテナの偏波面が垂直から
大きく傾き又は水平となるために実効利得が大き
く低下することとなる。この実効利得の低下は携
帯無線装置が水平に置かれた状態で最大となり、
後述するように焼く11.5dBに達する。従つて、
水平に置かれた携帯無線装置に対しても通話のた
めの呼出しを可能とするためには、アンテナを常
時垂直に保持できる車載用の移動無線装置の場合
に比較し、基地局の実効送信電力11.5dBも増加
させなければならないという問題点がある。
In the case of UHF band portable wireless devices such as these, the polarization plane of the sleeve antenna etc. attached to the device often does not match the polarization plane of the base station antenna both during calls and during standby. do not have. In other words, with respect to the vertical polarization of the base station antenna, it is inevitable that hand-held portable wireless devices that can be easily held and handled with one hand are used at an angle during calls or placed horizontally during standby. Therefore, the plane of polarization of the antenna is significantly tilted from vertical or becomes horizontal, resulting in a significant decrease in effective gain. This reduction in effective gain is greatest when the portable radio device is placed horizontally;
It reaches 11.5dB as described below. Therefore,
In order to make it possible to make a call even to a mobile wireless device placed horizontally, the effective transmit power of the base station is required compared to the case of a mobile wireless device installed in a vehicle, where the antenna can be held vertically at all times. There is a problem in that it has to be increased by 11.5 dB.
本発明の目的は、基地局のアンテナを円偏波ア
ンテナとすることにより、上述の実効送信電力の
増加を低減し、水平に置かれた携帯無線装置に対
しても交信可能とすることができる陸上移動通信
システムを提供することである。 An object of the present invention is to reduce the above-mentioned increase in effective transmission power by using a circularly polarized antenna as a base station antenna, and to enable communication even with horizontally placed mobile radio devices. To provide a land mobile communication system.
本発明の陸上移動通信システムは、基地局なら
びにこれと交信する携帯無線装置を含む複数の陸
上移動局とから構成される陸上移動通信システム
において、前記基地局のアンテナが円偏波を送信
および受信する円偏波アンテナであり、前記陸上
移動局のアンテナが直線偏波を送信または受信す
る直線偏波アンテナとなるように構成されてい
る。
The land mobile communication system of the present invention comprises a base station and a plurality of land mobile stations including portable wireless devices that communicate with the base station, in which an antenna of the base station transmits and receives circularly polarized waves. The antenna of the land mobile station is configured to be a linearly polarized antenna that transmits or receives linearly polarized waves.
次に図面を参照して本発明を詳細に説明する。 Next, the present invention will be explained in detail with reference to the drawings.
第１図はUHF帯を用いた一般的な陸上移動通
信システムにおいて、携帯無線装置スリーブアン
テナを傾けたときの平均的な実効利得の低下を示
す特性図で、曲線Ａ（実線）は基地局のアンテナ
が垂直偏波である従来の場合を、曲線Ｂ（破線）
は基地局のアンテナを円偏波とした本発明の場合
を示している。第１図の曲線は市街地のように基
地局からの直接波以外に多数の水平方向からの反
射波が存在するレーレーフエージング環境下の平
均的な実効利得として、水平面内の指向性利得の
平均地（水平偏波用ダイポールアンテナで−
3.5dBとなる）を用いて算出したもので、曲線Ａ
の場合は基地局からの電波の交信偏波識別度を
8dB（900MHz帯での実測値は６〜10dBである）
と想定した。第１図の曲線Ａからの、基地局のア
ンテナが垂直偏波の場合はスリーブアンテナが水
平（θ＝90）になつたときに約11.5dBの実効利
得の低下があり、水平に置かれた携帯無線装置を
呼出すためには基地局の実効送信電力を11.5dB
も増加させねばならないことになる。これに対し
て基地局が円偏波の場合の相対実効利得の低下は
曲線Ｂから約3.5dBであり、直線偏波の場合に比
べて8dB改善される。ただし、基地局から水平偏
波成分として垂直偏波成分と同じ電力が送信され
ることから、必要な実効送信電力の増加量は
6.5dBとなり、実効送信電力としては5dBの改善
となる。また、陸上移動局のアンテナが垂直と水
平の場合の実効利得の偏差が大幅に改善されるた
め、広域サービスを実施する際のゾーン構成にお
いて、同一周波数の再使用を考慮する上でも有利
となる。 Figure 1 is a characteristic diagram showing the average effective gain drop when the sleeve antenna of a mobile radio device is tilted in a general land mobile communication system using the UHF band. Curve B (dashed line) represents the conventional case where the antenna is vertically polarized.
shows the case of the present invention in which the antenna of the base station is circularly polarized. The curve in Figure 1 is the average effective gain in a Leley fading environment where there are many reflected waves from the horizontal direction in addition to the direct waves from the base station, such as in an urban area. Earth (with a horizontally polarized dipole antenna)
3.5dB), and curve A
In the case of , the communication polarization discrimination degree of radio waves from the base station is
8dB (Actual measurement value in 900MHz band is 6-10dB)
I assumed that. From curve A in Figure 1, when the base station antenna is vertically polarized, the effective gain decreases by about 11.5 dB when the sleeve antenna is placed horizontally (θ = 90). To call a mobile wireless device, the effective transmit power of the base station must be 11.5 dB.
will also have to be increased. On the other hand, when the base station uses circularly polarized waves, the relative effective gain decreases by about 3.5 dB from curve B, which is an 8 dB improvement compared to when the base station uses linearly polarized waves. However, since the base station transmits the same power as the vertical polarization component as the horizontal polarization component, the amount of increase in effective transmission power required is
The result is 6.5dB, which is a 5dB improvement in effective transmission power. In addition, the deviation in effective gain between vertical and horizontal land mobile station antennas is significantly improved, which is advantageous when considering the reuse of the same frequency in zone configurations when implementing wide area services. .
なお、第１図の曲線Ｂは基地局からだ円偏波率
の良好な円偏波が送信されるとして産出したもの
であるが、円偏波に近い水平偏波成分の大きいだ
円偏波が送信された場合には実効利得の偏差は更
に小さくなり、長軸方向が水平でだ円偏波率が
3dBのだ円偏波ではこの偏差はほとんど無くな
る。この場合に基地局に基地局に要求される実効
送信電力の増加はほぼ5dBでよいこととなる。従
つて、本発明における円偏波には、このような円
偏波に近いだ円偏波を含むものとする。 Note that curve B in Figure 1 was generated assuming that a circularly polarized wave with a good elliptical polarization rate is transmitted from the base station, but it is also possible that an elliptical polarized wave with a large horizontal polarization component close to circularly polarized wave is transmitted. In the case of transmission, the deviation of the effective gain becomes even smaller, and the long axis direction is horizontal and the elliptical polarization coefficient is
With 3dB elliptical polarization, this deviation almost disappears. In this case, the increase in effective transmission power required of the base station may be approximately 5 dB. Therefore, circularly polarized waves in the present invention include elliptical polarized waves that are close to such circularly polarized waves.
第２図は本発明の一実施例の基地局の構成を示
す概念図、第３図は第２図に対応した広域サービ
スのためのサービスゾーンの構成法を示すゾーン
構成図である。第２図において、１は送受共用器
を含む送受信装置、２は電力分配器、３−１，…
…３−ｎは送受共用の円偏波アンテナであり、ｎ
個のだ円偏波率の良好な指向性アンテナが水平面
内の無指向特性を得るように組合わされ、第３図
に示すように基地局４を中心としてほぼ円形のサ
ービスゾーン５を有する陸上移動通信システムが
構成される。
FIG. 2 is a conceptual diagram showing the configuration of a base station according to an embodiment of the present invention, and FIG. 3 is a zone configuration diagram showing a method of configuring a service zone for wide area service corresponding to FIG. In FIG. 2, 1 is a transmitting/receiving device including a duplexer, 2 is a power divider, 3-1,...
...3-n is a circularly polarized antenna for both transmission and reception, and n
Directional antennas with good elliptical polarization are combined to obtain omnidirectional characteristics in the horizontal plane, and as shown in FIG. A communication system is configured.
第４図は本発明の他の実施例の基地局の構成を
示す概念図、第５図は第４図に対応したゾーン構
成図である。第４図においては、送受信装置６−
１，……６−ｍはそれぞれ扇型の水平面内指向性
を有する円扇波アンテナ７−１，……７−ｍに接
続されており、第５図のような基地局８を中心に
花弁状のサービスゾーン９−１，……９−ｍを有
する陸上移動通信システムが構成される。 FIG. 4 is a conceptual diagram showing the configuration of a base station according to another embodiment of the present invention, and FIG. 5 is a zone configuration diagram corresponding to FIG. 4. In FIG. 4, the transmitting/receiving device 6-
1, . . . 6-m are connected to circular fan wave antennas 7-1, . A land mobile communication system having service zones 9-1, . . . 9-m is configured.
以上詳細に説明したように、本発明の陸上移動
通信システムによれば、基地局のアンテナを円偏
波アンテナとすることにより、携帯無線装置の置
き方によるアンテナ実効利得の偏差が小さくなる
ため、基地局の実効送信電力の増加が少なくて水
平に置かれた携帯無線装置とも交信が可能となる
効果がある。
As explained in detail above, according to the land mobile communication system of the present invention, by using a circularly polarized antenna as the antenna of the base station, the deviation in the effective antenna gain due to the placement of the mobile radio device is reduced. This has the advantage that the effective transmission power of the base station does not increase much and it is possible to communicate with a horizontally placed mobile radio device.
第１図は本発明の作用を説明するための携帯無
線装置のアンテナ偏波面を傾けたときの実効利得
の低下を示す特性図、第２図は本発明の一実施例
の基地局の構成を示す概念図、第３図は第２図に
対応するゾーン構成図、第４図は本発明の他の実
施例の基地局の構成を示す概念図、第５図は第４
図に対応するゾーン構成図である。
１，６−ｊ（ｊ＝１−ｍ）……送受信装置、２
……電力分配器、３−ｉ（ｉ＝１−ｎ），７−ｊ…
…円偏波アンテナ、４，８……基地局、５，９−
ｊ……サービスゾーン。
FIG. 1 is a characteristic diagram showing the reduction in effective gain when the antenna polarization plane of a portable wireless device is tilted to explain the effect of the present invention, and FIG. 2 is a diagram showing the configuration of a base station according to an embodiment of the present invention. 3 is a zone configuration diagram corresponding to FIG. 2, FIG. 4 is a conceptual diagram showing the configuration of a base station according to another embodiment of the present invention, and FIG.
It is a zone configuration diagram corresponding to the figure. 1,6-j (j=1-m)...transmitting/receiving device, 2
...Power divider, 3-i (i=1-n), 7-j...
...Circularly polarized antenna, 4,8...Base station, 5,9-
j...Service zone.
Claims (1)
を含む複数の陸上移動局とから構成される陸上移
動通信システムにおいて、前記基地局のアンテナ
が円偏波を送信および受信する円偏波アンテナで
あり、前記陸上移動局のアンテナが直線偏波を送
信または受信する直線偏波アンテナであることを
特徴とする陸上移動通信システム。1. In a land mobile communication system consisting of a base station and a plurality of land mobile stations including portable wireless devices that communicate with the base station, the antenna of the base station is a circularly polarized antenna that transmits and receives circularly polarized waves, A land mobile communication system characterized in that the antenna of the land mobile station is a linearly polarized antenna that transmits or receives linearly polarized waves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9625686A JPS62252226A (en) | 1986-04-24 | 1986-04-24 | Land mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9625686A JPS62252226A (en) | 1986-04-24 | 1986-04-24 | Land mobile communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62252226A JPS62252226A (en) | 1987-11-04 |
| JPH058889B2 true JPH058889B2 (en) | 1993-02-03 |
Family
ID=14160116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9625686A Granted JPS62252226A (en) | 1986-04-24 | 1986-04-24 | Land mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62252226A (en) |
-
1986
- 1986-04-24 JP JP9625686A patent/JPS62252226A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62252226A (en) | 1987-11-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |