JPS6357972B2 - - Google Patents

Info

Publication number
JPS6357972B2
JPS6357972B2 JP54057243A JP5724379A JPS6357972B2 JP S6357972 B2 JPS6357972 B2 JP S6357972B2 JP 54057243 A JP54057243 A JP 54057243A JP 5724379 A JP5724379 A JP 5724379A JP S6357972 B2 JPS6357972 B2 JP S6357972B2
Authority
JP
Japan
Prior art keywords
signal
frequency
antenna
antennas
frequency converter
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
Application number
JP54057243A
Other languages
Japanese (ja)
Other versions
JPS55149544A (en
Inventor
Shinichi Ootani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Electric Co Ltd filed Critical Nippon Electric Co Ltd
Priority to JP5724379A priority Critical patent/JPS55149544A/en
Publication of JPS55149544A publication Critical patent/JPS55149544A/en
Publication of JPS6357972B2 publication Critical patent/JPS6357972B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0822Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection according to predefined selection scheme

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Description

【発明の詳細な説明】 本発明は通信の相手側より送られてくる信号の
電界強度の変動(フエージング)に対応できる時
分割ダイバーシテイ受信装置に関するものであ
る。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a time division diversity receiving apparatus that can cope with fluctuations in electric field strength (fading) of signals sent from a communication partner.

一般に、中距離以上の短波通信、見通し外通信
などではフエーシング対策としてダイバシテイ方
式が採用されている。これはフエーシングの状況
ができるだけ相関の少ない2つ以上の信号を得る
ようにして、これらの信号を選択または合成する
ことによつて良質の通信を行なうものである。
In general, a diversity method is adopted as a countermeasure against facing in shortwave communication over medium distances, non-line-of-sight communication, etc. This is to obtain two or more signals whose phasing conditions have as little correlation as possible, and to perform high-quality communication by selecting or combining these signals.

従来のダイバーシテイ方式は、走差法、選択法
最適比合成比、等利得合成法などがあり、それぞ
れに適した信号伝送が可能である。しかし、これ
ら各方式は、2台以上の同種受信機を設け、受信
信号のレベル合せ回路、位相合成回路等を必要と
し、その構成が複雑となる場合が多かつた。特に
移動通信においては通信機器の複雑化が装置の信
頼性、保守性を劣化させ、コスト、容積等を増加
させる問題がある。
Conventional diversity methods include a running difference method, a selection method, an optimal ratio combination ratio, an equal gain combination method, etc., and signal transmission suitable for each method is possible. However, each of these systems requires the provision of two or more receivers of the same type, a level adjustment circuit for received signals, a phase synthesis circuit, etc., and the configuration thereof is often complicated. Particularly in mobile communications, there is a problem that the increasing complexity of communication equipment deteriorates the reliability and maintainability of the equipment, and increases cost, volume, etc.

本発明は、これらの欠点を改善するため、受信
機の構成を大きく変えずに、複数個のアンテナを
ナイキストの標本化速度又はそれ以上の速度で切
り換えることにより、最大の受信電界にあるアン
テナより得られる信号の信号対雑音比を確保する
ようにした時分割ダイバーシテイ受信装置にあ
る。
In order to improve these drawbacks, the present invention switches multiple antennas at the Nyquist sampling rate or faster, without significantly changing the configuration of the receiver. The present invention is a time division diversity receiving device designed to ensure the signal-to-noise ratio of the obtained signal.

以下図面について本発明を詳細に説明する。 The invention will be explained in detail below with reference to the drawings.

第1図は、単側波帯(SSB)通信に適用できる
本発明の実施例のブロツク図である。図中、11
〜1oは受信アンテナ群、2は各アンテナ群11
oのうちアンテナ切換制御器4の切換信号によ
り1個のアンテナを選択する巡回型アンテナ切換
器、3は切換られたアンテナ切換器2の出力を入
力して受信信号を復調する単側帯波受信機であ
る。この受信機3は、受信信号に局部発振器17
からの信号を供給して周波数変換する混合器5と
この混合器の出力から所定帯域の信号をそれぞれ
とり出す帯域波器6,7,8と、これら帯域
波器6〜8の各出力が搬送波発振器12,13,
14をそれぞれ供給されてSSB信号をそれぞれ復
調する復調器9,10,11と、これら復調信号
を合成する信号合成器15と、低域波器16と
から構成される。
FIG. 1 is a block diagram of an embodiment of the invention applicable to single sideband (SSB) communications. In the figure, 1 1
~1 o is the receiving antenna group, 2 is each antenna group 1 1 ~
1 o is a cyclic antenna switching device that selects one antenna according to a switching signal from an antenna switching controller 4, and 3 is a single sideband reception that inputs the output of the switched antenna switching device 2 and demodulates the received signal. It is a machine. This receiver 3 applies a local oscillator 17 to the received signal.
a mixer 5 that supplies a signal from the mixer and converts the frequency; band wave generators 6, 7, and 8 that extract signals in a predetermined band from the output of this mixer; each output of these band wave generators 6 to 8 is a carrier wave. Oscillators 12, 13,
The demodulator 14 includes demodulators 9, 10, and 11 which are each supplied with SSB signals and demodulates the SSB signals, a signal synthesizer 15 which synthesizes these demodulated signals, and a low frequency converter 16.

このアンテナ切換制御器4は、アンテナ切換器
2の切換速度、接続時間および切換電圧波形を制
御し、この制御器4の出力信号の波形は、第2図
に示すように、n番目のアンテナ1oを受信機3
へ接続するように、次の条件を満足させるもので
ある。
This antenna switching controller 4 controls the switching speed, connection time, and switching voltage waveform of the antenna switching device 2, and the waveform of the output signal of this controller 4 is as shown in FIG. o receiver 3
It satisfies the following conditions so that it can be connected to:

T≦1/2m τ=T/n ここで T:制御電圧のくり返し周期 m:ベースバンド信号の最高周波数 τ:制御電圧(パルス)の印加時間(幅) n:アンテナの数 この場合の第1図の主要個所a〜eにおける信
号波形V(t)(左側)および周波数スペクトラム
(ω)(右側)は第3図a〜eに示される。第3図
aは通信の相手側より送られた信号の時間軸にお
ける波形と、それを周波数領域で表現したSSB信
号の1例である。ここで、ωsはスペクトラムの
中心角周波数、ωmはベースバンド信号の最大角
周波数である。第3図bは2個のアンテナ(n=
2)で受けたアンテナ切換器2の出力信号を混合
器5により周波数変換した時の混合器出力波形と
周波数スペクトラムである。ここで、ω′sはωsの
周波数変換後の角周波数である。第3図cは中心
周波数がそれぞれωs,ωs′+2ωn,ωs′−2ωnの帯
域波器(BPF)6〜8を通過後の信号波形と
周波数スペクトラムで、ωs′+4ωn以上ならびに
ωs′−4ωn以下に中心周波数を持つ不要スペクト
ラムをこのBPF6〜8で除去する。例えば、通
常のSSB受信機を例に取り、 ωs′=2π×3.18×106 γad/sec ωm=2π×2.4×103 γad/sec とすると、こらBPF6〜8の通過帯域幅は、
2.4KHz〜7.2KHzの間で選べば歪のない信号が得
られる。従つて、サンプリング周波数がナイキス
トの標本化速度以上の断続された信号であつても
受信信号の正常な復調が可能である。
T≦1/2m τ=T/n where T: Repetition period of control voltage m: Maximum frequency of baseband signal τ: Application time (width) of control voltage (pulse) n: Number of antennas In this case, the first The signal waveform V(t) (left side) and frequency spectrum (ω) (right side) at main points a to e in the figure are shown in FIGS. 3 a to e. FIG. 3a shows an example of the waveform of a signal sent from the communication partner on the time axis and the SSB signal expressed in the frequency domain. Here, ωs is the center angular frequency of the spectrum, and ωm is the maximum angular frequency of the baseband signal. Figure 3b shows two antennas (n=
2) shows the mixer output waveform and frequency spectrum when the output signal from the antenna switching device 2 received in step 2 is frequency-converted by the mixer 5. Here, ω's is the angular frequency after frequency conversion of ωs. Figure 3c shows the signal waveform and frequency spectrum after passing through bandpass filters (BPF) 6 to 8 with center frequencies of ωs, ωs′+2ωn, and ωs′−2ωn, respectively, which are greater than ωs′+4ωn and less than ωs′−4ωn. The unnecessary spectrum having the center frequency is removed by this BPF6 to 8. For example, taking a normal SSB receiver as an example, and assuming that ωs'=2π×3.18×10 6 γad/sec ωm=2π×2.4×10 3 γad/sec, the passband width of BPF6 to 8 is as follows.
If you choose between 2.4KHz and 7.2KHz, you will get a distortion-free signal. Therefore, even if the received signal is an intermittent signal whose sampling frequency is higher than the Nyquist sampling rate, normal demodulation of the received signal is possible.

また、第1図の構成の変形として復調損失を約
7dB程度まで許容し得るシステムであればωs′+
2ωnとωs′−2ωnの各々に中心周波数を持つ帯域
波器(例えば、6と8)と各々に接続される復
調器は省略することも可能である。
In addition, as a modification of the configuration shown in Figure 1, the demodulation loss can be reduced to approximately
If the system can tolerate up to about 7dB, ωs′+
It is also possible to omit the band wave generators (for example, 6 and 8) having center frequencies at 2ωn and ωs'-2ωn, respectively, and the demodulators connected to each of them.

第3図dはSSB波復調用のそう入搬送波の周波
数スペクトラム、第3図eは電力合成回路15の
出力端子に接続される低域波器16の出力にお
ける信号波形と周波数スペクトラムである。
FIG. 3d shows the frequency spectrum of the input carrier wave for SSB wave demodulation, and FIG. 3e shows the signal waveform and frequency spectrum at the output of the low frequency converter 16 connected to the output terminal of the power combining circuit 15.

本発明によれば、アンテナ11〜1oに入射する
受信信号が等レベルでなく、n個のうちの1個を
除く他のアンテナの受信電界が極端に弱い場合で
もT≦1/2m、τ=T/nの条件を満足していれ
ばフエーシングによる回線品質の劣化を防ぐこと
ができる。この場合nが大きくなるに従つて信号
電力の損失が増大して行くが、第2図の制御波形
を矩形波の代りに三角波として、受信波形も三角
波にすることによりこの損失を少くすることもで
きる。この場合は、アンテナの切換に制御信号レ
ベルにより抵抗の変化するPINダイオードを用い
ることにより、三角受信波を得ることができる。
According to the present invention, even if the received signals incident on the antennas 1 1 to 1 o are not at the same level and the received electric fields of all but one of the n antennas are extremely weak, T≦1/2m, If the condition τ=T/n is satisfied, deterioration in line quality due to facing can be prevented. In this case, the loss of signal power increases as n increases, but this loss can be reduced by using a triangular wave instead of a rectangular wave for the control waveform shown in Figure 2, and by making the received waveform also a triangular wave. can. In this case, a triangular received wave can be obtained by using a PIN diode whose resistance changes depending on the control signal level for antenna switching.

以上説明したように、大きなフエージングのあ
る移動通信にSSBを利用する場合は、移動体に4
分の1波長(入/4)から1波長(入)程度の間
隔に2個以上のアンテナを設置し、適当な速度で
切換えて受信機へ接続することにより、振幅の安
定した復調信号が得られる。この場合、受信機通
常の回路構成のSSB受信機であればよい。
As explained above, when using SSB for mobile communications with large fading, it is necessary to
By installing two or more antennas at intervals of about 1/4 wavelength (in/4) to 1 wavelength (in) and connecting them to the receiver by switching at an appropriate speed, a demodulated signal with stable amplitude can be obtained. It will be done. In this case, the receiver may be an SSB receiver with a normal circuit configuration.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の実施例のブロツク図、第2図
は第1図のアンテナ切換制御信号の波形図、第3
図a〜eは第1図の主要個所a〜eにおける信号
波形図と周波数スペクトラムである。 図において、11o……受信アンテナ、2……
アンテナ切換器、3……受信機、4……アンテナ
切換制御回路、5……周波数変換用混合器、6〜
8……帯域波器、9〜11……信号復調器、1
2〜14……そう入搬送波発振器、15……信号
合成回路、16……低域波器、17……局部発
振器である。
Figure 1 is a block diagram of an embodiment of the present invention, Figure 2 is a waveform diagram of the antenna switching control signal in Figure 1, and Figure 3 is a waveform diagram of the antenna switching control signal in Figure 1.
Figures a to e are signal waveform diagrams and frequency spectra at main points a to e in Figure 1. In the figure, 1 1 ... o ...receiving antenna, 2...
Antenna switching device, 3...Receiver, 4...Antenna switching control circuit, 5...Frequency conversion mixer, 6-
8... Bandwidth wave generator, 9-11... Signal demodulator, 1
2 to 14...Input carrier wave oscillator, 15...Signal synthesis circuit, 16...Low band generator, 17...Local oscillator.

Claims (1)

【特許請求の範囲】[Claims] 1 所定間隔で設けられたn個のアンテナと、こ
れらアンテナの給電部に接続され、これらn個の
アンテナを所定周期により順次切換えて1個のア
ンテナを選択するアンテナ切換器と、この切換器
の選択された端子に接続されて周波数変換する周
波数変換器と、この周波数変換器の出力を波す
る中間周波波器と、この中間周波波器の出力
を最高周波数mのベースバンド信号に復調する
復調器と、前記アンテナ切換器の前記切換周期お
よび切換電圧の印加時間を制御する切換制御器と
を備え、前記アンテナ切換周期Tを1/2mまたは
それ以下とし前記印加時間をT/nとすることを
特徴とする時分割ダイバーシテイ受信装置。
1. n antennas arranged at predetermined intervals, an antenna switching device that is connected to the feeder of these antennas and that sequentially switches these n antennas at a predetermined period to select one antenna; A frequency converter that is connected to a selected terminal to convert the frequency, an intermediate frequency converter that converts the output of this frequency converter, and a demodulator that demodulates the output of this intermediate frequency converter to a baseband signal of the highest frequency m. and a switching controller for controlling the switching period of the antenna switching device and the application time of the switching voltage, wherein the antenna switching period T is 1/2 m or less and the application time is T/n. A time division diversity receiving device characterized by:
JP5724379A 1979-05-10 1979-05-10 Time sharing diversity receiver Granted JPS55149544A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5724379A JPS55149544A (en) 1979-05-10 1979-05-10 Time sharing diversity receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5724379A JPS55149544A (en) 1979-05-10 1979-05-10 Time sharing diversity receiver

Publications (2)

Publication Number Publication Date
JPS55149544A JPS55149544A (en) 1980-11-20
JPS6357972B2 true JPS6357972B2 (en) 1988-11-14

Family

ID=13050084

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5724379A Granted JPS55149544A (en) 1979-05-10 1979-05-10 Time sharing diversity receiver

Country Status (1)

Country Link
JP (1) JPS55149544A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH081429U (en) * 1990-10-22 1996-10-01 五郎 松田 Car visor amulet case

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63318827A (en) * 1987-06-22 1988-12-27 Matsushita Electric Works Ltd Radio equipment

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5087516A (en) * 1973-12-05 1975-07-14

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5087516A (en) * 1973-12-05 1975-07-14

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH081429U (en) * 1990-10-22 1996-10-01 五郎 松田 Car visor amulet case

Also Published As

Publication number Publication date
JPS55149544A (en) 1980-11-20

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