JPH0626356B2 - Wireless communication device - Google Patents
Wireless communication deviceInfo
- Publication number
- JPH0626356B2 JPH0626356B2 JP63266860A JP26686088A JPH0626356B2 JP H0626356 B2 JPH0626356 B2 JP H0626356B2 JP 63266860 A JP63266860 A JP 63266860A JP 26686088 A JP26686088 A JP 26686088A JP H0626356 B2 JPH0626356 B2 JP H0626356B2
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- Prior art keywords
- capacity
- signal
- transmission
- signals
- switching control
- Prior art date
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Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はディジタルマイクロ波通信システムにおいて用
いられる無線通信装置に係り、特にフェージング発生時
の通信救済方式に関する。The present invention relates to a wireless communication device used in a digital microwave communication system, and more particularly to a communication rescue method when fading occurs.
（従来の技術） 周知のように、無線伝送路では降雨減衰や大気中に発生
するダクト等に起因するフラットフェージング、受信点
に至る電波伝搬路が複数となることによるマルチパスフ
ェージングなど各種のフェージングが発生する。(Prior Art) As is well known, various fading such as flat fading caused by rain attenuation and ducts generated in the atmosphere in a radio transmission path, multipath fading due to multiple radio wave propagation paths reaching a receiving point, etc. Occurs.
そこで、従来のディジタルマイクロ波通信システムで
は、フェージング発生時の通信救済方式として、フラッ
トフェージングに対してはスペースダイバーシチ方式や
周波数ダイバーシチ方式を採用し、またマルチパスフェ
ージングに対してはこれによる振幅歪を自動等化器によ
って補償する方式を採用している。Therefore, in the conventional digital microwave communication system, as a communication rescue method when fading occurs, a space diversity method or a frequency diversity method is adopted for flat fading, and amplitude distortion due to this is applied for multipath fading. It employs a method of compensation by an automatic equalizer.
（発明が解決しようとする課題） しかしながら、前述した従来の通信救済方式には次のよ
うな問題がある。(Problems to be Solved by the Invention) However, the above-described conventional communication rescue method has the following problems.
スペースダイバーシチ方式は、２面以上のアンテナを用
いるので、アンテナの数量が増加すること、および例え
ば鉄塔の異なる位置に配置する場合には鉄塔の強度を余
分に高める必要のあること等から設備費用が嵩む。Since the space diversity method uses antennas with two or more surfaces, the number of antennas increases, and, for example, when arranging at different positions of the steel tower, it is necessary to increase the strength of the steel tower. Bulky.
また、周波数ダイバーシチ方式は、同一データあるいは
同一電話回線等を２波以上の周波数を用いて伝送するの
で、周波数有効利用の観点からすれば問題のある方式で
ある。Further, the frequency diversity method is a problematic method from the viewpoint of effective use of frequencies, since the same data or the same telephone line is transmitted using frequencies of two or more waves.
さらに、自動等化器は、マルチパスフェージングに対し
ては有効であるが、フラットフェージングに対しては何
ら回線品質の改善に寄与し得ない。Furthermore, although the automatic equalizer is effective for multipath fading, it cannot contribute to the improvement of line quality for flat fading.
本発明は、このような従来の問題に鑑みなされたもの
で、その目的は、安価な構成で周波数の有効利用が図
れ、かつ各種のフェージングに有効に機能しうる通信救
済方式を備える無線通信装置を提供することにある。The present invention has been made in view of such a conventional problem, and an object thereof is to provide a wireless communication device having a communication rescue method capable of effectively using frequencies with an inexpensive configuration and capable of effectively functioning for various types of fading. To provide.
（課題を解決するための手段） 前記目的を達成するために、本発明の無線通信装置は次
の如き構成を有する。(Means for Solving the Problems) In order to achieve the above object, the wireless communication device of the present invention has the following configuration.
即ち、本発明の無線通信装置は、所定数の送信信号を含
む複数の送信信号についてディジタル変調処理を施し大
容量伝送信号を形成する大容量変調手段と；前記所定数
の送信信号についてディジタル変調処理を施し小容量伝
送信号を形成する小容量変調手段と；受信復調された第
１の切替制御信号に基づき前記所定数の送信信号を前記
大容量変調手段と前記小容量変調手段のいずれか一方へ
切替え出力するとともに、前記大容量伝送信号と前記小
容量伝送信号のいずれか一方が無線送信されるように切
替え制御する第１の切替手段と；無線受信信号について
ディジタル復調処理を施し複数の受信信号を復調出力す
るとともに、第１の回線品質評価信号を形成出力する大
容量復調手段と；無線受信信号について復調処理を施し
所定数の受信信号を復調出力するとともに、第２の回線
品質評価信号を形成出力する小容量復調手段と；第２の
切替制御信号に基づき前記複数の受信信号と前記所定数
の受信信号のいずれか一方を受信信号として取込む第２
の切替手段と；前記第１および第２の回線品質評価信号
に基づき前記第２の切替制御信号と前記所定数の送信信
号に含ませる第１の切替制御信号とを形成出力する切替
制御手段と；を備えたことを特徴とするものである。That is, the wireless communication device of the present invention comprises a large-capacity modulating means for performing digital modulation processing on a plurality of transmission signals including a predetermined number of transmission signals to form a large-capacity transmission signal; and a digital modulation processing for the predetermined number of transmission signals. A small capacity modulation means for applying a predetermined number of transmission signals to one of the large capacity modulation means and the small capacity modulation means based on the first switching control signal received and demodulated; First switching means for switching and outputting, and controlling switching so that either one of the large-capacity transmission signal and the small-capacity transmission signal is wirelessly transmitted; a plurality of reception signals which are subjected to digital demodulation processing on the radio reception signal A large-capacity demodulation means for demodulating and outputting the first line quality evaluation signal; Small capacity demodulation means for demodulating and outputting and forming and outputting a second line quality evaluation signal; one of the plurality of reception signals and the predetermined number of reception signals as a reception signal based on a second switching control signal Second to capture
Switching means for forming and outputting the second switching control signal and the first switching control signal included in the predetermined number of transmission signals based on the first and second line quality evaluation signals. Is provided.
（作用） 次に、前記の如く構成される本発明の無線通信装置の作
用を説明する。(Operation) Next, the operation of the wireless communication device of the present invention configured as described above will be described.
周知のように、ディジタルマイクロ波通信システムにお
ける伝送帯域幅は例えば位相変調（ＰＳＫ）方式のよう
に低多値の小容量変調方式の方が、例えば直交振幅変調
（ＱＡＭ）方式のような高多値の大容量変調方式よりも
狭いものである。As is well known, for a transmission bandwidth in a digital microwave communication system, a low multilevel small capacity modulation system such as a phase modulation (PSK) system has a higher transmission bandwidth than a quadrature amplitude modulation (QAM) system. The value is narrower than the large capacity modulation method.
本発明ではこの伝送帯域幅の広狭と回線品質の関係に着
目し、重要な送信信号（回線）を救済しようとするもの
である。In the present invention, attention is paid to the relationship between the width of the transmission bandwidth and the line quality, and an attempt is made to rescue an important transmission signal (line).
即ち、フェージングの発生によって回線品質が劣化する
と、送信側は受信側から送られて来た第１の切替制御信
号によって送信系を大容量変調手段から小容量変調手段
に切替える。受信側も同様に第２の切替制御信号によっ
て受信系が大容量復調手段から小容量復調手段に切替え
られる。伝送容量を大容量から小容量へ変更し、伝送帯
域幅を狭くするのである。その結果、フラットフェージ
ングに対してはＣ／Ｎ値(Carrier to Noise ratio)の許
容度が増大し、またマルチパスフェージングに対しては
帯域内振幅歪に対する許容度が増大し、大容量伝送信号
については所要の回線品質を確保することが可能とな
る。That is, when the line quality deteriorates due to the occurrence of fading, the transmitting side switches the transmission system from the large capacity modulating means to the small capacity modulating means by the first switching control signal sent from the receiving side. Similarly, on the receiving side, the receiving system is switched from the large capacity demodulating means to the small capacity demodulating means by the second switching control signal. The transmission capacity is changed from a large capacity to a small capacity to narrow the transmission bandwidth. As a result, the tolerance of C / N value (Carrier to Noise ratio) increases for flat fading, and the tolerance for in-band amplitude distortion increases for multipath fading. Can secure the required line quality.
斯くして、アンテナを２面以上設けたり、また複数の周
波数を用いることなく、つまり、安価な構成で周波数の
有効利用が図れ、かつ各種のフェージングに有効に機能
しうる通信救済方式を実現できることとなる。Thus, it is possible to realize a communication rescue method that can effectively utilize frequencies with a low-cost configuration without providing two or more antennas or using a plurality of frequencies, and that can effectively function for various types of fading. Becomes
（実施例） 以下、本発明の実施例を図面を参照して説明する。(Example) Hereinafter, the Example of this invention is described with reference to drawings.
第１図は本発明の一実施例に係る無線通信装置で構成し
たシステム例を示す。第１図において、１Ａ（１Ｂ）は
伝送容量が１４０Mbps、変調方式が１６ＱＡＭ方式であ
る大容量変調送信機、２Ａ（２Ｂ）は伝送容量が３４Mb
ps、変調方式が４ＰＳＫ方式である小容量変調送信機、
３Ａ（３Ｂ）および４Ａ（４Ｂ）はこれらに対応する大
容量受信復調機および小容量受信復調機である。FIG. 1 shows an example of a system composed of a wireless communication device according to an embodiment of the present invention. In FIG. 1, 1A (1B) has a transmission capacity of 140 Mbps, and a large-capacity modulation transmitter having a 16QAM modulation scheme, and 2A (2B) has a transmission capacity of 34 Mb.
ps, small capacity modulation transmitter whose modulation method is 4PSK method,
3A (3B) and 4A (4B) are a large capacity reception demodulator and a small capacity reception demodulator corresponding to them.
無線通信装置Ａから同Ｂへの送信は無線周波数Ｆ１を使
用し、逆向きは無線周波数Ｆ′1を使用するが、送受信
信号は例えば４種であって、無線通信装置Ａの入力端子
（０１，０２，０３，０４）に印加された４種の送信信
号は無線通信装置Ｂの出力端子（０５，０６，０７，０
８）から取り出され、無線通信装置Ｂの入力端子（０
９，１０，１１，１２）に印加された４種の送信信号は
無線通信装置Ａの出力端子（１３，１４，１５，１６）
から取り出される。そして、４種の送受信信号のうちの
１つは重要信号として特別に扱われるようになってい
る。Transmission from the wireless communication device A to the same B uses the radio frequency F 1 and in the opposite direction uses the radio frequency F ′ 1 , but there are four types of transmission / reception signals, and the input terminal ( 01, 02, 03, 04), the four types of transmission signals are applied to the output terminals (05, 06, 07, 0) of the wireless communication device B.
8), and the input terminal (0
The four types of transmission signals applied to 9, 10, 11, 12) are output terminals (13, 14, 15, 16) of the wireless communication device A.
Taken from. Then, one of the four types of transmission / reception signals is specially treated as an important signal.
即ち、入力端子（０１，０２，０３，０４）および同
（０９，１０，１１，１２）のうちの３つの入力端子
（０１，０２，０３）および同（０９，１０，１１）に
印加される３種の送信信号はそれぞれ対応する大容量変
調送信機１Ａ（１Ｂ）に直接的に入力するが、残りの入
力端子０４（１２）に印加される１つの送信信号はスイ
ッチＳＷ１（ＳＷ３）に入力する。That is, three input terminals (01, 02, 03) and the same (09, 10, 11) of the input terminals (01, 02, 03, 04) and the same (09, 10, 11, 12) are applied. The three types of transmission signals are directly input to the corresponding large-capacity modulation transmitters 1A (1B), but one transmission signal applied to the remaining input terminal 04 (12) is input to the switch SW1 (SW3). input.
スイッチＳＷ１（ＳＷ３）は、（第１の）切替制御信号
ａ（ｄ）に応答して入力信号を大容量変調送信機１Ａ
（１Ｂ）と小容量変調送信機２Ａ（２Ｂ）のいずれか一
方へ入力させるとともに、大容量変調送信機１Ａ（１
Ｂ）の出力（大容量伝送信号）と小容量変調送信機２Ａ
（２Ｂ）の出力（小容量伝送信号）のいずれか一方をア
ンテナ系へ送出することを行う。The switch SW1 (SW3) responds to the (first) switching control signal a (d) to input the input signal to the large capacity modulation transmitter 1A.
(1B) or the small capacity modulation transmitter 2A (2B), and the large capacity modulation transmitter 1A (1B
B) output (large capacity transmission signal) and small capacity modulation transmitter 2A
Either one of the outputs (2B) (small-capacity transmission signal) is sent to the antenna system.
従って、大容量伝送信号は４種の送信信号からなり、小
容量伝送信号は１つの送信信号からなる。Therefore, the large-capacity transmission signal consists of four types of transmission signals, and the small-capacity transmission signal consists of one transmission signal.
これらの伝送信号は大容量受信復調機３Ｂ（３Ａ）およ
び小容量受信復調機４Ｂ（４Ａ）にて受信復調される
が、同時にその受信状態が監視されその監視結果を反映
させた回線品質評価信号ｆ（ｅ）および同ｈ（ｇ）が形
成出力される。この監視は例えば受信電界強度の検出、
あるいはビット誤り率の推移検出等によって行うことが
できる。These transmission signals are received and demodulated by the large-capacity reception demodulator 3B (3A) and the small-capacity reception demodulator 4B (4A). At the same time, the reception state is monitored and the line quality evaluation signal reflecting the monitoring result is received. The f (e) and the same h (g) are formed and output. This monitoring is, for example, detection of received electric field strength,
Alternatively, it can be performed by detecting transition of bit error rate.
大容量受信復調機３Ｂ（３Ａ）は、４種の受信信号を復
調形成するが、そのうちの３種は直接的に出力端子（０
５，０６，０７）および同（１３，１４，１５）へ送出
され、残りの重要信号はスイッチＳＷ２（ＳＷ４）の一
方の切替入力端子へ送出される。また、小容量受信復調
機４Ｂ（４Ａ）は１つの受信信号（重要信号）を復調形
成するが、それはスイッチＳＷ２（ＳＷ４）の他方の切
替入力端子へ送出される。The large-capacity reception demodulator 3B (3A) demodulates and forms four types of received signals, three of which are directly output terminals (0
5,06,07) and (13,14,15), and the remaining important signals are sent to one switching input terminal of the switch SW2 (SW4). The small-capacity reception demodulator 4B (4A) demodulates and forms one reception signal (important signal), which is sent to the other switching input terminal of the switch SW2 (SW4).
スイッチＳＷ２（ＳＷ４）は、（第２の）の切替制御信
号ｂ（ｃ）に応答して両切替入力端子への入力信号の一
方を出力端子０８（１６）へ送出する。The switch SW2 (SW4) sends one of the input signals to both switching input terminals to the output terminal 08 (16) in response to the (second) switching control signal b (c).
要するに、送信側の入力端子０４（１２）に印加された
重要信号は受信側の出力端子０８（１６）から送出され
るのである。In short, the important signal applied to the input terminal 04 (12) on the transmitting side is transmitted from the output terminal 08 (16) on the receiving side.
そして、切替制御信号発生器５Ａ（５Ｂ）は、大容量受
信復調機３Ａ（３Ｂ）が発生した（第１の）回線品質評
価信号ｅ（ｆ）および小容量受信復調機４Ａ（４Ｂ）が
発生した（第２の）回線品質評価信号ｇ（ｈ）の内容を
反映させた切替制御信号（ｃ，ｄ）［（ａ，ｂ）］を発
生する。そのうち、切替制御信号ｄ（ａ）は送信信号た
る重要信号に含ませて受信側へ伝達され、それがスイッ
チＳＷ３（ＳＷ１）の制御信号となる。また、切替制御
信号ｃ（ｂ）は自装置内のスイッチＳＷ４（ＳＷ２）へ
出力される。The switching control signal generator 5A (5B) generates the (first) line quality evaluation signal e (f) generated by the large capacity reception demodulator 3A (3B) and the small capacity reception demodulator 4A (4B). A switching control signal (c, d) [(a, b)] reflecting the contents of the (second) channel quality evaluation signal g (h) is generated. Among them, the switching control signal d (a) is included in an important signal which is a transmission signal and transmitted to the reception side, which becomes a control signal of the switch SW3 (SW1). Further, the switching control signal c (b) is output to the switch SW4 (SW2) in the own device.
以上の構成において、例えば無線通信装置Ａから同Ｂへ
大容量伝送信号を送信している際にフェージングが発生
すると、受信側の大容量受信復調機３Ｂは回線品質劣化
を内容とする回線品質評価信号ｆを発生し、これを受け
た切替制御信号発生器５Ｂは所定内容の切替制御信号
ａ，同ｂを発生する。In the above configuration, for example, when fading occurs during transmission of a large capacity transmission signal from the wireless communication device A to the same B, the large capacity reception demodulator 3B on the receiving side evaluates the line quality including the line quality deterioration. The signal f is generated, and the switching control signal generator 5B receiving the signal f generates switching control signals a and b having a predetermined content.
切替制御信号ａは重要信号に含まれて入力端子１２から
大容量変調送信機１Ｂへ入力し、他の信号とともに無線
通信装置Ａ側へ無線伝送される。従って、無線通信装置
Ａでは切替制御信号ａが大容量受信復調機３Ａで復調さ
れ、スイッチＳＷ１に制御信号として入力する。その結
果、スイッチＳＷ１が作動し、送信系が大容量変調送信
機１Ａから小容量変調送信機２Ａに切替えられ、入力端
子０４に印加される重要信号（小容量伝送信号）が無線
送信されることになる。The switching control signal a is included in the important signal, is input from the input terminal 12 to the large capacity modulation transmitter 1B, and is wirelessly transmitted to the wireless communication device A side together with other signals. Therefore, in the wireless communication device A, the switching control signal a is demodulated by the large-capacity reception demodulator 3A and input to the switch SW1 as a control signal. As a result, the switch SW1 operates, the transmission system is switched from the large capacity modulation transmitter 1A to the small capacity modulation transmitter 2A, and the important signal (small capacity transmission signal) applied to the input terminal 04 is wirelessly transmitted. become.
このとき、無線通信装置Ｂでは、スイッチＳＷ２が切替
制御信号ｂによって受信系を大容量受信復調機３Ｂから
小容量受信復調機４Ｂに切替えているので、重要信号が
出力端子０８から取り出される。At this time, in the wireless communication device B, the switch SW2 switches the reception system from the large-capacity reception demodulator 3B to the small-capacity reception demodulator 4B by the switching control signal b, so that the important signal is taken out from the output terminal 08.
つまり、重要信号については、フェージング発生によっ
ても通信が確保される。That is, for the important signal, communication is secured even if fading occurs.
そして、小容量受信復調機４Ｂは、その後重要信号の受
信状態を監視し、その回線品質が所定値を越えると、回
線品質の回復を示す回線品質評価信号ｈを発生するの
で、切替制御信号発生器５Ｂは再び所定内容の切替制御
信号ａ，同ｂを発生する。Then, the small-capacity reception demodulator 4B subsequently monitors the reception state of the important signal and, when the line quality exceeds a predetermined value, generates the line quality evaluation signal h indicating the recovery of the line quality. The device 5B again generates the switching control signals a and b having a predetermined content.
その結果、無線通信装置Ａ側では、送信系が小容量変調
送信機２Ａから大容量変調送信機１Ａに切替えられ、ま
た無線通信装置Ｂ側では、受信系が小容量受信復調機４
Ｂから大容量受信復調機３Ｂに切替えられ、通常状態へ
復帰する。As a result, on the wireless communication device A side, the transmission system is switched from the small capacity modulation transmitter 2A to the large capacity modulation transmitter 1A, and on the wireless communication device B side, the reception system is small capacity reception demodulator 4.
The B is switched to the large-capacity reception demodulator 3B to return to the normal state.
（発明の効果） 以上説明したように、本発明の無線通信装置によれば、
大容量伝送系と小容量伝送系とを備え、かつ受信系にて
受信状態を監視し、その監視結果たる切替制御信号によ
って送信側と受信側が伝送系を切替えられるようにした
ので、大容量伝送系にて送受信している際にフェージン
グが発生し回線品質が劣化したときは伝送容量を小容量
化して伝送帯域幅の狭小化が図れる。その結果、小容量
伝送信号については所要の回線品質を確保することが可
能となる。As described above, according to the wireless communication device of the present invention,
It has a large-capacity transmission system and a small-capacity transmission system, and the reception state is monitored by the reception system, and the transmission system can be switched between the transmission side and the reception side by the switching control signal that is the monitoring result. When fading occurs during transmission and reception in the system and the line quality deteriorates, the transmission capacity can be reduced to narrow the transmission bandwidth. As a result, it becomes possible to secure the required line quality for small capacity transmission signals.
斯くして、本発明によれば、アンテナを２面以上設けた
り、また複数の周波数を用いることなく、つまり安価な
構成で周波数の有効利用が図れ、かつ各種のフェージン
グに有効に機能しうる通信救済方式を提供できる効果が
ある。Thus, according to the present invention, it is possible to effectively use the frequency without providing two or more antennas or to use a plurality of frequencies, that is, with a low-cost configuration, and to function effectively for various fading. There is an effect that a relief method can be provided.
第１図は本発明の一実施例に係る無線通信装置で構成し
たディジタルマイクロ波通信システムの構成ブロック図
である。 １Ａ，１Ｂ……大容量変調送信機、２Ａ，２Ｂ……小容
量変調送信機、３Ａ，３Ｂ……大容量受信復調機、４
Ａ，４Ｂ……小容量受信復調機、５Ａ，５Ｂ……切替制
御信号発生器、ＳＷ１〜ＳＷ４……スイッチ、Ａ，Ｂ…
…無線通信装置。FIG. 1 is a configuration block diagram of a digital microwave communication system including a wireless communication device according to an embodiment of the present invention. 1A, 1B ... Large capacity modulation transmitter, 2A, 2B ... Small capacity modulation transmitter, 3A, 3B ... Large capacity receiving demodulator, 4
A, 4B ... Small-capacity reception demodulator, 5A, 5B ... Switching control signal generator, SW1-SW4 ... Switches, A, B ...
... wireless communication device.
Claims (1)
ついてディジタル変調処理を施し大容量伝送信号を形成
する大容量変調手段と；前記所定数の送信信号について
ディジタル変調処理を施し小容量伝送信号を形成する小
容量変調手段と；受信復調された第１の切替制御信号に
基づき前記所定数の送信信号を前記大容量変調手段と前
記小容量変調手段のいずれか一方へ切替え出力するとと
もに、前記大容量伝送信号と前記小容量伝送信号のいず
れか一方が無線送信されるように切替え制御する第１の
切替手段と；無線受信信号についてディジタル復調処理
を施し複数の受信信号を復調出力するとともに、第１の
回線品質評価信号を形成出力する大容量復調手段と；無
線受信信号について復調処理を施し所定数の受信信号を
復調出力するとともに、第２の回線品質評価信号を形成
出力する小容量復調手段と；第２の切替制御信号に基づ
き前記複数の受信信号と前記所定数の受信信号のいずれ
か一方を受信信号として取込む第２の切替手段と；前記
第１および第２の回線品質評価信号に基づき前記第２の
切替制御信号と前記所定数の送信信号に含ませる前記第
１の切替制御信号とを形成出力する切替制御手段と；を
備えたことを特徴とする無線通信装置。1. Large-capacity modulation means for performing digital modulation processing on a plurality of transmission signals including a predetermined number of transmission signals to form a large-capacity transmission signal; and small-capacity transmission for performing digital modulation processing on the predetermined number of transmission signals. A small capacity modulating means for forming a signal; switching the predetermined number of transmission signals to either the large capacity modulating means or the small capacity modulating means on the basis of the first switching control signal received and demodulated, and First switching means for switching control so that either one of the large-capacity transmission signal and the small-capacity transmission signal is wirelessly transmitted; and digital demodulation processing is performed on the wireless reception signal to demodulate and output a plurality of reception signals. A large-capacity demodulating means for forming and outputting a first line quality evaluation signal; and for performing demodulation processing on a radio reception signal and demodulating and outputting a predetermined number of reception signals. A small-capacity demodulation means for forming and outputting a second line quality evaluation signal; and one for receiving one of the plurality of received signals and the predetermined number of received signals as a received signal based on a second switching control signal. Two switching means; switching control for forming and outputting the second switching control signal and the first switching control signal included in the predetermined number of transmission signals based on the first and second line quality evaluation signals. And a wireless communication device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63266860A JPH0626356B2 (en) | 1988-10-22 | 1988-10-22 | Wireless communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63266860A JPH0626356B2 (en) | 1988-10-22 | 1988-10-22 | Wireless communication device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02113653A JPH02113653A (en) | 1990-04-25 |
| JPH0626356B2 true JPH0626356B2 (en) | 1994-04-06 |
Family
ID=17436666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63266860A Expired - Lifetime JPH0626356B2 (en) | 1988-10-22 | 1988-10-22 | Wireless communication device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0626356B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4426183C1 (en) * | 1994-07-23 | 1995-10-19 | Ant Nachrichtentech | Directional radio system for point-to-multipoint connections |
| SE515837C2 (en) | 1999-01-22 | 2001-10-15 | Ericsson Telefon Ab L M | Adaptable bandwidth |
| KR100376582B1 (en) * | 2000-11-27 | 2003-03-17 | 에스케이 텔레콤주식회사 | Channel switching method for packet transmission in IMT-2000 system |
-
1988
- 1988-10-22 JP JP63266860A patent/JPH0626356B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02113653A (en) | 1990-04-25 |
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