JPH0779306B2 - Packet spreading communication method - Google Patents

Packet spreading communication method

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Publication number
JPH0779306B2
JPH0779306B2 JP1269647A JP26964789A JPH0779306B2 JP H0779306 B2 JPH0779306 B2 JP H0779306B2 JP 1269647 A JP1269647 A JP 1269647A JP 26964789 A JP26964789 A JP 26964789A JP H0779306 B2 JPH0779306 B2 JP H0779306B2
Authority
JP
Japan
Prior art keywords
packet
sequence
original
communication method
spreading communication
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
Application number
JP1269647A
Other languages
Japanese (ja)
Other versions
JPH03131127A (en
Inventor
玄弥 岩崎
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
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP1269647A priority Critical patent/JPH0779306B2/en
Publication of JPH03131127A publication Critical patent/JPH03131127A/en
Publication of JPH0779306B2 publication Critical patent/JPH0779306B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Radio Relay Systems (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、パケット拡散通信方式に関し、特に衛星通信
等のように遅延時間に変動のある場合に好適なパケット
拡散通信方式に関する。TECHNICAL FIELD The present invention relates to a packet spreading communication system, and more particularly to a packet spreading communication system suitable when there is a delay time variation such as satellite communication.

〔従来の技術〕[Conventional technology]

従来、パケット拡散通信方式では第２図（ａ）〜（ｌ）
の信号フォマット図に示すように、まず、送信側の原パ
ケットP1，P2〜Pnのパケット列（第２図（ａ））をある
拡散符号列S1，S2〜Snの符号列（第２図（ｂ））と乗じ
て送信パケット列P1・S1，P2・S2〜Pn・Sn（第２図
（ｃ））を作成し、この送信パケット列を時間軸上に連
続して送信する。受信側ではある遅延時間Δｔで受信さ
れた受信パケット列P1・S1，P2・S2〜Pn・Sn（第２図
（ｄ））に送信側で乗じた拡散符号列S1，S2〜Snの符号
列でもとのパケット列にもどすことにより再生パケット
Ｐ（第２図（ｅ））を得ていた。ここで遅延時間Δｔが
ある場合に受信側で乗算すべき符号列S1〜Snと遅延した
受信パケット列P1・S1〜Pn・Snとの間に微少時間差があ
ると、例えば、受信パケットP1・S1の末尾が次の符号列
S2の乗算により再生され第２図（ｅ）のようなP1・S2の
誤った再生パケットが混入するおそれがあった。2. Description of the Related Art Conventionally, in a packet diffusion communication system, FIGS.
As shown in the signal format diagram of FIG. 1 , first , the packet sequence of the original packets P 1 and P 2 to P n (FIG. 2 (a)) on the transmission side is coded to a certain spreading code sequence S 1 and S 2 to S n . The transmission packet sequence P 1 · S 1 , P 2 · S 2 to P n · S n (Fig. 2 (c)) is created by multiplying the sequence (Fig. 2 (b)) and this transmission packet sequence is Send continuously on the axis. On the receiving side, the received packet sequence P 1 · S 1 , P 2 · S 2 to P n · S n (FIG. 2 (d)) received at a delay time Δt is multiplied by the spreading code sequence S 1 on the transmitting side. , S 2 to S n are returned to the original packet sequence to obtain the reproduction packet P (FIG. 2 (e)). Here, when there is a delay time Δt, if there is a minute time difference between the code sequence S 1 to S n to be multiplied on the receiving side and the delayed reception packet sequence P 1 · S 1 to P n · S n , for example, , The end of received packets P 1 and S 1 is the next code string
Erroneous reproduced packet of P 1 · S 2, such as the second view is played (e) there is a risk of contamination by the multiplication of S 2.

〔発明が解決しようとする課題〕[Problems to be Solved by the Invention]

上述した従来のパケット拡散通信方式では、パケット信
号を連続的に時間軸上に並べているので、衛星通信等の
ように伝送遅延時間が大きく、かつ、変動のある場合
に、受信側ではどこまでがPn-1でどこからがPnなのかが
正確に判定できない。したがって、前述のようにPnの一
部に誤ってSn+1またはSn-1を乗じてしまい正しく原パケ
ットを再生できないという欠点があった。In the conventional packet spreading communication method described above, since the packet signals are continuously arranged on the time axis, when the transmission delay time is large and there is fluctuation such as satellite communication, how much P It is not possible to accurately determine where P n is from n-1 . Therefore, as described above, there is a drawback that a part of P n is mistakenly multiplied by S n + 1 or S n-1 and the original packet cannot be reproduced correctly.

〔課題を解決するための手段〕[Means for Solving the Problems]

本発明のパケット拡散通信方式は、原パケット信号にあ
らかじめ定められた符号列を乗じて生成した送信パケッ
ト信号列を時間軸上に並べるパケット拡散通信方式にお
いて、前記原パケット信号の各パケット信号間にガード
タイムを設けている。A packet spreading communication system of the present invention is a packet spreading communication system in which a transmission packet signal sequence generated by multiplying an original packet signal by a predetermined code sequence is arranged on a time axis, and between the packet signals of the original packet signal. There is a guard time.

〔実施例〕〔Example〕

次に本発明について図面を参照して説明する。第１図
（ａ）〜（ｃ）は本発明の一実施例の信号フォマット図
である。まず、受信側において、原パケットP1〜Pnの各
パケットPn間には、伝送遅延の不定性を見込んだガード
タイムＴの間隔があけられている（第１図（ａ））。拡
散符号列S1，S2〜Snは、原パケットPnより時間間隔が長
く、かつ、原パケットPnの時間位相より早い時間位相の
符号列が配列されている（第１図（ｂ））。送信される
各パケットPnは、前述の原パケットP1〜Pnを前述の拡散
符号列Sn＝±１にしたがって正転または反転したパケッ
トである。すなわち送信パケット列PTは PT＝Ｐ・Sn とすると、受信側では送信側と同じ拡散符号列Sn′＝
１を乗ずるので、 Pn・Sn＝Ｐ・Sn・Sn′＝Ｐ となり、送信側と同じ原パケットＰが時間Ｔの間隔で再
生することができる（第１図（ｃ））。Next, the present invention will be described with reference to the drawings. 1 (a) to 1 (c) are signal format diagrams of one embodiment of the present invention. First, on the receiving side, an interval of guard time T is set between each packet P n of the original packets P 1 to P n in consideration of indefiniteness of transmission delay (FIG. 1 (a)). Spreading code sequence S 1, S 2 to S n, the time interval from the original packet P n is long, and, early phase of the code sequence from the time the phase of the original packet P n are arranged (FIG. 1 (b )). Each transmitted packet P n is a packet obtained by inverting or inverting the above-mentioned original packets P 1 to P n according to the above-mentioned spread code string S n = ± 1. That is, assuming that the transmission packet sequence P T is P T = P · S n , the receiving side has the same spreading code sequence S n ′ = as the transmitting side.
Since it is multiplied by 1, P n · S n = P · S n · S n ′ = P, and the same original packet P as on the transmitting side can be reproduced at intervals of time T (FIG. 1 (c)).

〔発明の効果〕〔The invention's effect〕

以上説明したように本発明は、送信側の原パケットの各
パケット間にガードタイムを設け、かつ、拡散符号列の
時間間隔を原パケットより長くすることにより、伝送遅
延時間に不定性のある場合パケット拡散通信において
も、常に正しく原パケットを再生できる効果がある。As described above, according to the present invention, when the transmission delay time is indefinite by providing the guard time between each packet of the transmitting side original packet and making the time interval of the spreading code sequence longer than the original packet. Even in packet diffusion communication, the original packet can always be reproduced correctly.

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

第１図（ａ）〜（ｃ）は本発明の一実施例の信号フォマ
ット図、第２図（ａ）〜（ｅ）は従来のパケット拡散通
信方式の信号フォマット図である。 P1，P2〜Pn…原パケット、S1，S2〜Sn…拡散符号列、P1
S1〜PnSn…送信パケット列。1 (a) to 1 (c) are signal format diagrams of an embodiment of the present invention, and FIGS. 2 (a) to 2 (e) are signal format diagrams of a conventional packet spreading communication system. P 1, P 2 ~P n ... original packet, S 1, S 2 ~S n ... spreading code sequence, P 1
S 1 to P n S n ... Transmission packet sequence.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】原パケット信号にあらかじめ定められた符
号列を乗じて生成した送信パケット信号列を時間軸上に
並べるパケット拡散通信方式において、前記原パケット
信号の各パケット信号間にガードタイムを設けることを
特徴とするパケット拡散通信方式。1. A packet spreading communication system in which a transmission packet signal sequence generated by multiplying an original packet signal by a predetermined code sequence is arranged on a time axis, and a guard time is provided between the packet signals of the original packet signal. A packet spreading communication method characterized by the above.
JP1269647A 1989-10-16 1989-10-16 Packet spreading communication method Expired - Fee Related JPH0779306B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1269647A JPH0779306B2 (en) 1989-10-16 1989-10-16 Packet spreading communication method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1269647A JPH0779306B2 (en) 1989-10-16 1989-10-16 Packet spreading communication method

Publications (2)

Publication Number Publication Date
JPH03131127A JPH03131127A (en) 1991-06-04
JPH0779306B2 true JPH0779306B2 (en) 1995-08-23

Family

ID=17475263

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1269647A Expired - Fee Related JPH0779306B2 (en) 1989-10-16 1989-10-16 Packet spreading communication method

Country Status (1)

Country Link
JP (1) JPH0779306B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020089079A (en) * 2001-05-23 2002-11-29 엘지전자 주식회사 Method for arranging LS and QLS code in a frame in mobile system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS529311A (en) * 1975-07-12 1977-01-24 Yuuseidaijin Ssra communication system using line separator signal
JPS6269735A (en) * 1985-09-24 1987-03-31 Hitachi Ltd Butst synchronization system in time division multiple access communication system

Also Published As

Publication number Publication date
JPH03131127A (en) 1991-06-04

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