JPH07212828A - Spread spectrum communication method - Google Patents
Spread spectrum communication methodInfo
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- JPH07212828A JPH07212828A JP6002787A JP278794A JPH07212828A JP H07212828 A JPH07212828 A JP H07212828A JP 6002787 A JP6002787 A JP 6002787A JP 278794 A JP278794 A JP 278794A JP H07212828 A JPH07212828 A JP H07212828A
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、スペクトル拡散方式に
より無線通信を行なう１台の親局と１又は複数台の子局
からなる無線ゾーンを複数形成した無線システムのスペ
クトル拡散通信方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spread spectrum communication method for a wireless system in which a plurality of wireless zones are formed, each of which comprises one master station and one or a plurality of slave stations which perform wireless communication by a spread spectrum system.
【０００２】[0002]
【従来の技術】この種の無線システムは、例えば図４に
示すように、サービスエリア１を複数の無線ゾーン２，
２，…に分割し、隣接する無線ゾーン２間には異なる周
波数を配置し、その周波数の異なる無線ゾーン２の組を
単位としてサービスエリア１に割り当てるものが知られ
ている。2. Description of the Related Art In this type of wireless system, a service area 1 is divided into a plurality of wireless zones 2, as shown in FIG.
It is known that it is divided into 2, ..., Different frequencies are arranged between adjacent wireless zones 2, and a set of wireless zones 2 having different frequencies is assigned to the service area 1 as a unit.
【０００３】すなわち、図中斜線で示す無線ゾーンＯ，
Ａ，Ｂ，〜Ｅ，Ｆに同一の周波数を割り当て、また無線
ゾーンａ1 〜ａ6 には無線ゾーンＯ，Ａ，Ｂ，〜Ｅ，Ｆ
と異なり、かつ互いに異なる周波数を割り当てる。従っ
て全ゾーンに割り当てるのに必要な周波数群の数は７と
なる。That is, the wireless zone O, which is indicated by the diagonal lines in the figure,
The same frequency is assigned to A, B, to E, and F, and wireless zones O, A, B, to E, and F are assigned to the wireless zones a 1 to a 6.
And different frequencies are assigned. Therefore, the number of frequency groups required to be assigned to all zones is 7.
【０００４】また、特定の拡散コードを用いて通信チャ
ンネルを形成することにより、コード分割多元接続方式
（ＣＤＭＡ）を実現したものとして図５に示すものが知
られている。Further, as shown in FIG. 5, it is known that a code division multiple access system (CDMA) is realized by forming a communication channel using a specific spreading code.
【０００５】すなわち、無線ゾーン２内では親局から拡
散符号により拡散変調された信号を出力し、子局では親
局で使用した拡散符号と同一の符号で逆拡散を行ない、
情報信号を再生するようになっている。そしてどの無線
ゾーン２でも同じ周波数ｆを使用し、各無線ゾーン２間
では異なる拡散符号ＰＮ0 〜ＰＮ6 を使用している。ま
た、図中斜線で示すゾーン、すなわち拡散符号ＰＮ5 を
使用するゾーンのように、互いに電波干渉のないゾーン
間では同一の拡散符号を繰り返し使用していた。That is, in the wireless zone 2, the master station outputs a signal that has been spread and modulated by the spreading code, and the slave station performs despreading with the same code as the spreading code used by the parent station.
It is designed to reproduce information signals. The same frequency f is used in every wireless zone 2, and different spreading codes PN 0 to PN 6 are used in each wireless zone 2. Further, the same spreading code is repeatedly used between zones where there is no radio wave interference, such as a shaded zone in the figure, that is, a zone using the spreading code PN 5 .
【０００６】さらに、図６に示すように、信号の周波数
オフセットにより整合フィルタの相関値出力ピークが減
少することに着目し、無線ゾーン２間の互いの周波数を
ずらすことにより、ただ一つの拡散符号だけでスペクト
ル拡散通信による多元接続行なうものが知られている。
（１９９３年電子情報通信学会春季大会のＡ−２０７
「キャリア周波数オフセット拡散多元接続方式」） これは、各無線ゾーン２ともに同一の拡散符号ＰＮを使
用し、各無線ゾーン２間で互いの周波数を情報伝達速度
に相当する周波数Δｆの整数倍を中心周波数ｆ0 からず
らすようにしている。Further, as shown in FIG. 6, paying attention to the fact that the correlation value output peak of the matched filter decreases due to the frequency offset of the signal, by shifting the mutual frequency between the radio zones 2, only one spreading code is obtained. It is known that only multiple access is performed by spread spectrum communication.
(A-207 of the 1993 IEICE Spring Conference)
"Carrier frequency offset spreading multiple access method") This is because the same spreading code PN is used for each wireless zone 2 and the mutual frequency between the wireless zones 2 is centered on an integral multiple of the frequency Δf corresponding to the information transmission speed. The frequency f0 is shifted.
【０００７】[0007]
【発明が解決しようとする課題】図４に示す無線通信方
法は、他のゾーンからの干渉を受けにくくするためには
多数の周波数群を必要とする問題があった。The radio communication method shown in FIG. 4 has a problem that a large number of frequency groups are required to make it difficult to receive interference from other zones.
【０００８】例えば、図４において全ゾーンに割り当て
るのに必要な周波数群の数、すなわち繰り返しゾーン数
を７つから４つに減らせば、１つおきのゾーンで同一周
波数を使用することになり、繰り返しゾーン間の干渉が
増大することになる。すなわち、繰り返しゾーン数と同
一周波数を繰り返して使用するゾーン間距離とはトレー
ドオフの関係にある。For example, if the number of frequency groups required to be assigned to all zones in FIG. 4, that is, the number of repeating zones is reduced from 7 to 4, the same frequency is used in every other zone. Interference between repeating zones will increase. That is, there is a trade-off relationship between the number of repeating zones and the distance between zones where the same frequency is repeatedly used.
【０００９】このように図４に示す無線通信方法は、周
波数群の数が多く取れる自動車電話などの狭帯域の無線
通信方式には適しているが、周波数群の数が多く取れな
い広帯域のスペクトル拡散通信方式には適さなかった。As described above, the wireless communication method shown in FIG. 4 is suitable for a narrow band wireless communication system such as a car telephone in which a large number of frequency groups can be taken, but a wide band spectrum in which a large number of frequency groups cannot be taken. It was not suitable for the spread communication system.
【００１０】また、図５に示す無線通信方法は、システ
ムの全ゾーンにおいて同一の周波数帯の変調波を使用す
るので、希望波だけでなく、干渉波成分が雑音のように
重畳され、電波の使用状況によっては受信側において逆
拡散処理を行なっても希望波のみを取り出すことが困難
になる場合があり、干渉波のレベルが大きくなると一定
の通信品質を確保することができなくなる問題があっ
た。Further, since the radio communication method shown in FIG. 5 uses the modulated wave of the same frequency band in all zones of the system, not only the desired wave but also the interference wave component is superposed like noise, and Depending on the usage conditions, it may be difficult to extract only the desired wave even if despreading processing is performed on the receiving side, and there was a problem that a certain communication quality could not be secured when the level of the interference wave increased. .
【００１１】また、図６に示す無線通信方法は、有線に
おけるような同期通信の場合、すなわち各ゾーンで使用
する拡散符号間で同期が取れている場合には、情報伝送
速度の整数倍の周波数オフセットに対し相関値ピークは
理論的に０となる（送信データが連続１のとき）ため、
多元接続方式を行なう上で有効な方法である。しかし無
線通信の場合にはゾーン間で各拡散符号間の同期を取る
ことが非常に困難なことや実際のデータは連続１のみで
なく、１から０への反転もあることから、周波数オフセ
ットに対し相関値は０ではなくある値を示すことにな
る。Further, in the wireless communication method shown in FIG. 6, in the case of synchronous communication such as wired communication, that is, when the spread codes used in each zone are synchronized, a frequency that is an integer multiple of the information transmission rate. Since the correlation value peak is theoretically 0 with respect to the offset (when the transmission data is 1 continuously),
This is an effective method for performing a multiple access method. However, in the case of wireless communication, it is very difficult to synchronize each spreading code between zones, and the actual data is not only continuous 1 but also inverted from 1 to 0. On the other hand, the correlation value will show a certain value instead of zero.
【００１２】このため、図６のゾーン構成で周波数オフ
セットを行なって多元接続を行なう場合には、隣接する
ゾーンからの影響を大きく受ける。For this reason, when frequency offset is performed in the zone configuration of FIG. 6 to perform multiple access, it is greatly affected by the adjacent zones.
【００１３】このようなことから図６の場合も図５の場
合と同様、干渉波成分が雑音のように重畳され、電波の
使用状況によっては受信側において逆拡散処理を行なっ
ても希望波のみを取り出すことが困難になる場合があ
り、干渉波のレベルが大きくなると一定の通信品質を確
保することができなくなる問題があった。Therefore, in the case of FIG. 6 as well, as in the case of FIG. 5, the interference wave component is superimposed like noise, and only the desired wave is generated even if despreading processing is performed on the receiving side depending on the usage state of the radio wave. In some cases, it may be difficult to take out the signal, and when the level of the interference wave becomes large, there is a problem that a certain communication quality cannot be secured.
【００１４】そこで本発明は、周波数の有効利用を図る
ことができ、しかも各ゾーン間の干渉を大幅に低減でき
るスペクトル拡散通信方法を提供する。Therefore, the present invention provides a spread spectrum communication method capable of effectively utilizing frequencies and significantly reducing interference between zones.
【００１５】[0015]
【課題を解決するための手段】本発明は、スペクトル拡
散方式により無線通信を行なう１台の親局と１又は複数
台の子局からなる無線ゾーンを複数形成し、各無線ゾー
ンにおいて少なくとも隣接する無線ゾーン間は異なる周
波数帯を使用し、同一周波数帯を繰り返し使用する繰り
返し無線ゾーン間では同一の拡散符号を使用すると共に
情報伝送速度の整数倍に等しい周波数を中心周波数から
互いにオフセットさせ、かつ近接する繰り返し無線ゾー
ン間は少なくともオフセットさせる周波数の量を異なら
せて各無線ゾーンで親局と子局の無線通信を行なうこと
にある。According to the present invention, a plurality of wireless zones each including one master station and one or a plurality of slave stations that perform wireless communication by a spread spectrum system are formed, and each wireless zone is at least adjacent to each other. Different frequency bands are used between wireless zones, the same frequency band is repeatedly used.The same spreading code is used between repeated wireless zones, and frequencies equal to integer multiples of the information transmission rate are offset from the center frequency and close to each other. It is to perform the wireless communication between the master station and the slave station in each wireless zone by at least differentiating the amount of frequency to be offset between the wireless zones.
【００１６】[0016]
【作用】このようにすれば隣接するゾーン間では使用す
る周波数帯が異なるので、隣接ゾーンからの干渉は起こ
らない。また、同一周波数帯を繰り返し使用する繰り返
し無線ゾーンは隣接して配置せず、各ゾーン間において
は同一符号を使用し、かつ互いに情報伝送速度の整数倍
に等しい周波数を中心周波数から互いにオフセットさせ
ているので、繰り返しゾーン間の干渉を少なくでき、そ
の結果周波数の有効利用が図れる。By doing so, since the frequency bands used are different between the adjacent zones, interference from the adjacent zones does not occur. In addition, repetitive wireless zones that repeatedly use the same frequency band are not placed adjacent to each other, the same code is used between the zones, and frequencies equal to integer multiples of the information transmission rate are offset from the center frequency with respect to each other. Since the interference between the repeating zones can be reduced, the effective use of the frequency can be achieved.
【００１７】[0017]
【実施例】以下、本発明の実施例を図面を参照して説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００１８】第１実施例 図１に示すようにサービスエリア１１を複数の無線ゾー
ン１２，１２，…に分割している。各無線ゾーン１２，
１２，…は１台の親局と例えば複数台の子局からなり、
親局と各子局との間でスペクトル拡散通信方式で無線通
信を行なうようになっている。First Embodiment As shown in FIG. 1, the service area 11 is divided into a plurality of wireless zones 12, 12, .... Each wireless zone 12,
12, ... consists of one master station and multiple slave stations,
Wireless communication is performed between the master station and each slave station by a spread spectrum communication method.
【００１９】前記各無線ゾーン１２，１２，…に４つの
周波数帯ｆ1 〜ｆ4 を図に示すように割り当てる。すな
わち、周波数帯で見ればゾーン構成の繰り返しゾーン数
は４になっている。なお、各無線ゾーン１２の半径はＲ
になっている。Four frequency bands f 1 to f 4 are assigned to the respective radio zones 12, 12, ... As shown in the figure. That is, in the frequency band, the number of repeated zones in the zone configuration is four. The radius of each wireless zone 12 is R
It has become.
【００２０】ｆ1 の周波数帯を使用するゾーン２はゾー
ンＯ，Ａ〜Ｆの７つで、ゾーンＯの周波数を基準にして
ゾーンＡ，Ｃ，ＥではΔｆ、ゾーンＢ，Ｄ，Ｆでは２Δ
ｆだけオフセットさせ、それぞれのゾーンでは同一の拡
散符号を使用している。Zones 2 using the frequency band of f 1 are zones O, A to F, and Δf in zones A, C and E and 2Δ in zones B, D and F on the basis of the frequency of zone O.
It is offset by f and the same spreading code is used in each zone.
【００２１】なお、Δｆは、情報伝送速度に相当する周
波数となっている。It should be noted that Δf is a frequency corresponding to the information transmission speed.
【００２２】また、ｆ2 ，ｆ3 ，ｆ4 の周波数帯を使用
するゾーン２についてもｆ1 の周波数帯を使用するゾー
ン２と同様に周波数をオフセットさせている。Further, the frequency of the zone 2 using the frequency bands of f 2 , f 3 and f 4 is offset similarly to the zone 2 using the frequency band of f 1 .
【００２３】従って、同一周波数帯でかつ同一周波数オ
フセットとなるゾーンは、ゾーンＡ，Ｃ，Ｅ及びゾーン
Ｂ，Ｄ，Ｆとなる。そして同一周波数帯でかつ同一周波
数オフセットとなるゾーン間の距離、例えばゾーンＡ，
Ｃ間やゾーンＢ，Ｄ間の距離は、１つのゾーン半径がＲ
なので、６Ｒとなる。Therefore, zones having the same frequency band and the same frequency offset are zones A, C, E and zones B, D, F. Then, the distance between zones in the same frequency band and having the same frequency offset, for example, zone A,
As for the distance between C and zones B and D, one zone radius is R
So it will be 6R.
【００２４】この距離６Ｒはゾーン間の干渉をほぼ無視
できる距離になっている。The distance 6R is such that interference between zones can be almost ignored.
【００２５】この距離６Ｒのゾーン間隔を図４に示す従
来の周波数の繰り返し利用のみで実現しようとすると必
要な周波数帯の数は１２となり、本実施例の３倍の周波
数帯が必要となる。If the zone interval of the distance 6R is to be realized only by repeatedly using the conventional frequency shown in FIG. 4, the required number of frequency bands is 12, and the frequency band which is three times that of the present embodiment is required.
【００２６】このように従来に比べて３倍の周波数利用
効率となる。As described above, the frequency utilization efficiency is three times that of the conventional one.
【００２７】同一周波数帯で周波数をオフセットさせる
ゾーン間の距離、例えばゾーンＯ，Ａ間やゾーンＯ，Ｂ
間の距離は、１つのゾーン半径がＲなので、４Ｒとな
る。Distances between zones for offsetting frequencies in the same frequency band, for example, between zones O and A or zones O and B
The distance between them is 4R because one zone radius is R.
【００２８】これに対して図６に示す従来のものは周波
数をオフセットさせるゾーン間の距離は２Ｒで、ゾーン
間は隣接している。On the other hand, in the conventional device shown in FIG. 6, the distance between the zones for offsetting the frequency is 2R, and the zones are adjacent to each other.
【００２９】従って周波数帯が同じで周波数オフセット
させるているゾーン間の干渉を本実施例と図６に示す従
来のものを比較すると、本実施例は従来に比べてゾーン
間の距離が２倍となっているので、干渉となる電波の強
度は４分の１となり、従来に比べ干渉波による影響を大
幅に低減できる。Therefore, when comparing the interference between the zones having the same frequency band and offsetting the frequency between this embodiment and the conventional one shown in FIG. 6, the distance between the zones in this embodiment is twice that of the conventional one. As a result, the intensity of the radio wave that causes interference is reduced to 1/4, and the influence of the interference wave can be greatly reduced compared to the conventional case.
【００３０】従って、各ゾーン１２における親局と各子
局とのスペクトル拡散通信において一定の通信品質を確
保することが容易に実現できる。Therefore, it is possible to easily realize a certain communication quality in the spread spectrum communication between the master station and each slave station in each zone 12.
【００３１】また、使用する拡散符号を同じ周波数帯の
ゾーンのみでなく異なる周波数帯のゾーンにおいても同
一にしている。換言すれば、サービスエリア１１全域に
わたって同一の拡散符号が使用できる。従って、受信部
にＳＡＷマッチドフィルタを使用する場合には異なる符
号毎にフィルタを用意する必要が無く共通のフィルタを
使用でき、経済性を向上できる。Further, the spreading code to be used is made the same not only in zones of the same frequency band but also in zones of different frequency bands. In other words, the same spreading code can be used throughout the service area 11. Therefore, when the SAW matched filter is used in the receiving unit, it is not necessary to prepare a filter for each different code, a common filter can be used, and the economical efficiency can be improved.
【００３２】第２実施例 情報伝送速度が４８Ｋｂｐｓ、拡散符号が３１ｂｉｔの
場合、帯域幅は約３ＭHzとなる。２．４ＧHz帯の無線Ｌ
ＡＮシステムにこれを当てはめると、システム全体の帯
域幅は２６ＭHz確保されているため、図２に示すように
スペクトルが隣接する周波数帯と重ならないように周波
数を割り当てると、ｆ1 〜ｆ4 、ｆa 〜ｆd の８波確保
できる。そこでｆ1 〜ｆ4 の周波数帯とｆa 〜ｆd の周
波数帯を図に示すように交互に配置する。Second Embodiment When the information transmission rate is 48 Kbps and the spreading code is 31 bits, the bandwidth is about 3 MHz. 2.4GHz wireless L
When this is applied to the AN system, the bandwidth of the entire system is secured at 26 MHz, so if frequencies are assigned so that the spectrum does not overlap the adjacent frequency bands as shown in FIG. 2, f 1 to f 4 , f 8 waves a to f d can be secured. Therefore, the frequency bands f 1 to f 4 and the frequency bands f a to f d are alternately arranged as shown in the figure.
【００３３】サービスエリアがビル内のように階層構造
となり、さらにゾーンの形状が四角形の場合、例えば階
層構造が３階の場合には、１階の各ゾーンには図３の
(a) に示すように４つの周波数帯ｆ1 〜ｆ4 を隣接する
ゾーンからの干渉をなくすために図に示すように配置す
る。When the service area has a hierarchical structure like in a building and the shape of the zone is a quadrangle, for example, when the hierarchical structure is the third floor, each zone on the first floor is shown in FIG.
As shown in (a), four frequency bands f 1 to f 4 are arranged as shown in the figure in order to eliminate interference from adjacent zones.
【００３４】また、同一周波数帯、同一周波数オフセッ
トのゾーン間の干渉を無視できるようにするため、周波
数オフセット量として、０ＫHz、４８ＫHz、９６ＫHz、
１４４ＫHzの４つの量を図に示すように各ゾーンに割り
当てる。Further, in order to make it possible to ignore interference between zones having the same frequency band and the same frequency offset, the frequency offset amount is 0 KHz, 48 KHz, 96 KHz,
Four quantities of 144 KHz are assigned to each zone as shown.
【００３５】また、２階の各ゾーンには図３の(b) に示
すように４つの周波数帯ｆa 〜ｆdを隣接するゾーンか
らの干渉をなくすために図に示すように配置する。Further, on the second floor each zone is arranged as shown in FIG. In order to eliminate interference from adjacent zones four frequency bands f a ~f d as shown in (b) of FIG.
【００３６】また、同一周波数帯、同一周波数オフセッ
トのゾーン間の干渉を無視できるようにするため、周波
数オフセット量として、０ＫHz、４８ＫHz、９６ＫHz、
１４４ＫHzの４つの量を図に示すように１階と同様にし
て各ゾーンに割り当てる。Further, in order to make it possible to ignore interference between zones having the same frequency band and the same frequency offset, the frequency offset amount is 0 KHz, 48 KHz, 96 KHz,
Four quantities of 144 KHz are assigned to each zone in the same manner as the first floor as shown in the figure.
【００３７】さらに、３階の各ゾーンには図３の(c) に
示すように４つの周波数帯ｆ1 〜ｆ4 を隣接するゾーン
からの干渉をなくすために図に示すように１階と同様に
して配置する。Further, in each zone on the third floor, as shown in FIG. 3 (c), four frequency bands f 1 to f 4 are arranged on the first floor as shown in the figure in order to eliminate interference from adjacent zones. Place in the same way.
【００３８】また、同一周波数帯、同一周波数オフセッ
トのゾーン間の干渉を無視できるようにするため、周波
数オフセット量として、０ＫHz、４８ＫHz、９６ＫHz、
１４４ＫHzの４つの量を図に示すように１階とは異なら
せて各ゾーンに割り当てる。すなわち、３階は１階と同
一周波数帯を使用するため、相互の干渉が発生する可能
性がある。そこで相互の干渉を極力避けるため、距離が
最も近くなるゾーン間ではオフセット量を１階とは異な
らせる。Further, in order to make it possible to ignore interference between zones having the same frequency band and the same frequency offset, the frequency offset amount is 0 KHz, 48 KHz, 96 KHz,
The four frequencies of 144 KHz are assigned to each zone differently from the first floor as shown in the figure. That is, since the third floor uses the same frequency band as the first floor, mutual interference may occur. Therefore, in order to avoid mutual interference as much as possible, the offset amount is made different from that of the first floor between the zones having the shortest distance.
【００３９】例えば１階の中央のゾーンは周波数帯がｆ
1 で周波数オフセット量が０ＫHzであるのに対し、３階
の中央のゾーンは周波数帯がｆ1 と同じであるが周波数
オフセット量を４８ＫHzとして互いのゾーン間の干渉を
無くしている。For example, in the central zone on the first floor, the frequency band is f
While the frequency offset amount is 0 KHz at 1, the central zone on the third floor has the same frequency band as f1, but the frequency offset amount is set to 48 KHz to eliminate interference between the zones.
【００４０】なお、拡散符号は１〜３間の全てのゾーン
に対して同一の拡散符号を使用する。As the spreading code, the same spreading code is used for all zones between 1 and 3.
【００４１】このようにして３階構造のビルに対して周
波数帯ｆ1 〜ｆ4 、ｆa 〜ｆd 及び周波数オフセット量
０ＫHz、４８ＫHz、９６ＫHz、１４４ＫHzを適宜割り当
てることにより、同一階は勿論、上下の階のゾーンから
の干渉を受けること無く良好なスペクトル拡散通信を行
なうことができる。[0041] In this way, the frequency band with respect to building 3 floor structures f 1 ~f 4, f a ~f d and the frequency offset 0 kHz, 48KHz, 96KHz, by assigning appropriate 144 kHz, on floor, of course, Good spread spectrum communication can be performed without interference from the zones on the upper and lower floors.
【００４２】なお、ゾーン内の親局と子局との関係は１
対複数であっても１対１であってもよい。The relationship between the master station and the slave stations in the zone is 1
The number of pairs may be one or one.
【００４３】[0043]
【発明の効果】以上、本発明によれば、隣接するゾーン
間では使用する周波数帯が異なるので、隣接ゾーンから
の干渉は起こらない。また、同一周波数帯を使用する繰
り返しゾーンは隣接して配置されることはなく、各ゾー
ン間においては同一符号を使用し、かつ伝送速度の整数
倍に等しい周波数を中心周波数から互いにオフセットさ
せ、さらに少なくとも近接する繰り返しゾーン間ではオ
フセットさせる周波数の量を異ならせているので、繰り
返しゾーン間の干渉を大幅に低減することができる。As described above, according to the present invention, since the frequency bands used are different between the adjacent zones, interference from the adjacent zones does not occur. Further, repetitive zones using the same frequency band are not arranged adjacent to each other, the same code is used between the zones, and frequencies equal to an integral multiple of the transmission rate are offset from the center frequency, and Since at least adjacent repeating zones have different amounts of frequencies to be offset, interference between repeating zones can be significantly reduced.
【００４４】従って、周波数の有効利用が図れ、他のゾ
ーンからの干渉を受けずに無線通信ができるスペクトル
拡散通信方式を提供できる。Therefore, it is possible to provide a spread spectrum communication system which enables effective use of frequencies and enables wireless communication without interference from other zones.
【図１】本発明の第１実施例におけるゾーン構成を示す
図。FIG. 1 is a diagram showing a zone configuration according to a first embodiment of the present invention.
【図２】本発明の第２実施例における周波数配置を示す
図。FIG. 2 is a diagram showing a frequency allocation according to a second embodiment of the present invention.
【図３】本発明の第２実施例におけるゾーン構成を示す
図。FIG. 3 is a diagram showing a zone configuration in a second embodiment of the present invention.
【図４】従来のゾーン構成例を示す図。FIG. 4 is a diagram showing a conventional zone configuration example.
【図５】従来のゾーン構成例を示す図。FIG. 5 is a diagram showing an example of a conventional zone configuration.
【図６】従来のゾーン構成例を示す図。FIG. 6 is a diagram showing a conventional zone configuration example.
１１…サービスエリア １２…無線ゾーン 11 ... Service area 12 ... Wireless zone
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｊ 13/00 Ｇ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location H04J 13/00 G
Claims (1)
なう１台の親局と１又は複数台の子局からなる無線ゾー
ンを複数形成し、各無線ゾーンにおいて少なくとも隣接
する無線ゾーン間は異なる周波数帯を使用し、同一周波
数帯を繰り返し使用する繰り返し無線ゾーン間では同一
の拡散符号を使用すると共に情報伝送速度の整数倍に等
しい周波数を中心周波数から互いにオフセットさせ、か
つ近接する繰り返し無線ゾーン間は少なくともオフセッ
トさせる周波数の量を異ならせて各無線ゾーンで親局と
子局の無線通信を行なうことを特徴とするスペクトル拡
散通信方法。1. A plurality of wireless zones each including one master station and one or more slave stations that perform wireless communication by a spread spectrum method are formed, and different frequency bands are provided in at least adjacent wireless zones in each wireless zone. The same spreading code is used between repetitive wireless zones that use the same frequency band repeatedly, and frequencies equal to integer multiples of the information transmission rate are offset from the center frequency, and at least offset between adjacent repetitive wireless zones. A spread spectrum communication method, wherein wireless communication between a master station and a slave station is performed in each wireless zone with different amounts of frequencies to be used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6002787A JPH07212828A (en) | 1994-01-14 | 1994-01-14 | Spread spectrum communication method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6002787A JPH07212828A (en) | 1994-01-14 | 1994-01-14 | Spread spectrum communication method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07212828A true JPH07212828A (en) | 1995-08-11 |
Family
ID=11539073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6002787A Pending JPH07212828A (en) | 1994-01-14 | 1994-01-14 | Spread spectrum communication method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07212828A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003003782A1 (en) * | 2001-06-27 | 2003-01-09 | Nec Corporation | Cdma mobile communication system and its call cut-off prevention method |
| WO2008004577A1 (en) | 2006-07-04 | 2008-01-10 | Panasonic Corporation | Radio communication system |
| JP2009200657A (en) * | 2008-02-20 | 2009-09-03 | Nec Corp | Satellite communications system, transmitter, receiver, and satellite communication method used for them |
| US8504109B2 (en) | 2000-12-11 | 2013-08-06 | Apple Inc. | Antenna systems with common overhead for CDMA base stations |
| US9538392B2 (en) | 2000-12-11 | 2017-01-03 | Apple Inc. | Antenna systems with common overhead for CDMA base stations |
-
1994
- 1994-01-14 JP JP6002787A patent/JPH07212828A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8504109B2 (en) | 2000-12-11 | 2013-08-06 | Apple Inc. | Antenna systems with common overhead for CDMA base stations |
| US9538392B2 (en) | 2000-12-11 | 2017-01-03 | Apple Inc. | Antenna systems with common overhead for CDMA base stations |
| WO2003003782A1 (en) * | 2001-06-27 | 2003-01-09 | Nec Corporation | Cdma mobile communication system and its call cut-off prevention method |
| WO2008004577A1 (en) | 2006-07-04 | 2008-01-10 | Panasonic Corporation | Radio communication system |
| US9066356B2 (en) | 2006-07-04 | 2015-06-23 | Panasonic Intellectual Property Management Co., Ltd. | Wireless communication system provided in aircraft for communicating using plural wireless channels |
| JP2009200657A (en) * | 2008-02-20 | 2009-09-03 | Nec Corp | Satellite communications system, transmitter, receiver, and satellite communication method used for them |
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