JP2001148680A5 - Wireless transmitter and receiver - Google Patents
Wireless transmitter and receiver Download PDFInfo
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- JP2001148680A5 JP2001148680A5 JP1999330731A JP33073199A JP2001148680A5 JP 2001148680 A5 JP2001148680 A5 JP 2001148680A5 JP 1999330731 A JP1999330731 A JP 1999330731A JP 33073199 A JP33073199 A JP 33073199A JP 2001148680 A5 JP2001148680 A5 JP 2001148680A5
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- wireless communication
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- 230000001702 transmitter Effects 0.000 title description 3
- 238000001514 detection method Methods 0.000 description 17
- 230000005540 biological transmission Effects 0.000 description 15
- 230000000051 modifying Effects 0.000 description 15
- 230000001360 synchronised Effects 0.000 description 11
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 4
- 241001442055 Vipera berus Species 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Description
【特許請求の範囲】
【請求項１】
複数の無線通信装置からなる無線通信ネットワークにおいて、情報を送信する無線送信装置であって、
制御データ及び情報データをＯＦＤＭ変調するデータ変調手段と、
同期検出用符号系列をＯＦＤＭ変調し、変調信号のうち所定の部分信号を用いて同期信号を発生する同期信号発生手段と、
上記同期信号と制御データと情報データを含むフレームを生成するフレーム生成手段と、
上記フレームを送信する送信手段と、
を有することを特徴とする無線送信装置。
【請求項２】
上記同期信号は、実数部の信号からなる、
ことを特徴とする請求項１記載の無線送信装置。
【請求項３】
上記同期信号は、虚数部の信号からなる、
ことを特徴とする請求項１記載の無線送信装置。
【請求項４】
上記送信手段は、上記同期信号を少なくとも２回送信する
ことを特徴とする請求項１記載の無線送信装置。
【請求項５】
上記送信手段は、上記同期信号を少なくとも２回送信し、そのうち先頭及び／または最終の同期信号は、上記同期信号発生手段によって発生される同期信号を１８０度位相回転した信号である
ことを特徴とする請求項１記載の無線送信装置。
【請求項６】
上記同期信号発生手段は、上記同期信号を生成するとき、複数のサブキャリアのうち、ｍ（ｍは自然数、ｍ＞１）個おきにデータを設定して変調を行う
ことを特徴とする請求項１記載の無線送信装置。
【請求項７】
複数の無線通信装置からなる無線通信ネットワークにおいて、情報を受信する受信装置であって、
同期検出用符号系列をＯＦＤＭ変調し、変調信号のうち所定の部分信号を用いて形成される同期信号と、ＯＦＤＭ方式で変調された制御データ及び情報データを含むフレームを受信する受信手段と、
上記同期信号を検出する同期検出手段と、
を有することを特徴とする無線受信装置。
【請求項８】
上記同期検出手段により設定されるタイマ手段と、
上記同期検出手段によって上記同期信号を検出したタイミングに応じて上記タイマを設定し、上記タイマを基準に受信タイミングを設定する通信制御手段とをさらに備える、
ことを特徴とする請求項７の無線受信装置。
【請求項９】
上記同期検出手段は、受信信号のうち実数部と虚数部をそれぞれ所定の同期検出パターンデータとの相関演算を行い、実数部と虚数部の相関値を算出する相関演算回路を有する
ことを特徴とする請求項７記載の無線受信装置。
【請求項１０】
上記同期検出手段は、上記実数部と虚数部の相関値に基づいて絶対値を算出する絶対値演算回路と、
上記絶対値と所定のしきい値とを比較し、当該比較結果に応じて、上記同期信号の検出タイミングを示す同期検出信号を出力する比較回路とを有する
ことを特徴とする請求項９記載の無線受信装置。
[Claims]
[Claim 1]
A wireless transmission device that transmits information in a wireless communication network consisting of a plurality of wireless communication devices .
A data modulation means that OFDM-modulates control data and information data,
A synchronization signal generating means that OFDM-modulates a code sequence for synchronization detection and generates a synchronization signal using a predetermined partial signal among the modulated signals .
A frame generation means for generating a frame containing the synchronization signal, control data, and information data, and
The transmission means for transmitting the above frame and
A wireless transmitter characterized by having.
2.
The above synchronization signal consists of a real number part of the signal.
The wireless transmission device according to claim 1.
3.
The synchronization signal consists of an imaginary part of the signal.
The wireless transmission device according to claim 1.
4.
The transmitting means transmits the synchronization signal at least twice.
The wireless transmission device according to claim 1.
5.
The transmission means transmits the synchronization signal at least twice, and the first and / or final synchronization signals are signals obtained by phase-rotating the synchronization signal generated by the synchronization signal generation means by 180 degrees.
The wireless transmission device according to claim 1.
6.
When the synchronization signal generation means generates the synchronization signal, it modulates by setting data every m (m is a natural number, m> 1) among a plurality of subcarriers.
The wireless transmission device according to claim 1.
7.
A receiving device that receives information in a wireless communication network consisting of a plurality of wireless communication devices.
A receiving means that OFDM-modulates a code sequence for synchronization detection, receives a synchronization signal formed by using a predetermined partial signal among the modulated signals, and receives a frame containing control data and information data modulated by the OFDM method.
Synchronous detection means for detecting the above synchronization signal and
A wireless receiver characterized by having.
8.
The timer means set by the above synchronous detection means and
A communication control means for setting the timer according to the timing at which the synchronization signal is detected by the synchronization detection means and setting the reception timing based on the timer is further provided.
7. The wireless receiving device according to claim 7.
9.
The synchronous detection means has a correlation calculation circuit that calculates the correlation value between the real part and the imaginary part by performing a correlation calculation on each of the real part and the imaginary part of the received signal with predetermined synchronous detection pattern data.
7. The wireless receiving device according to claim 7 .
10.
The synchronous detection means includes an absolute value calculation circuit that calculates an absolute value based on the correlation value between the real part and the imaginary part, and an absolute value calculation circuit.
It has a comparison circuit that compares the absolute value with a predetermined threshold value and outputs a synchronization detection signal indicating the detection timing of the synchronization signal according to the comparison result.
9. The wireless receiver according to claim 9.
【０００１】
【発明の属する技術分野】
本発明は、複数の端末を無線で接続する無線ＬＡＮなどの無線送信装置および無線受信装置に関するものである。
[0001]
[Technical field to which the invention belongs]
The present invention relates to a wireless transmitting device such as a wireless LAN and a wireless receiving device that wirelessly connect a plurality of terminals.
例えば、同期信号として、３２サンプルのデータを用いることを例として考察する。同期信号をＰＮ符号で構成された場合、相関器は複素数と実数との乗算回路３２段によって構成することができる。一方、同期信号をＯＦＤＭ変調信号によって構成された場合、相関器を構成するために、複素数同士の乗算回路を３２段備えなければならない。このため、実数部のみからなるＰＮ符号の同期信号を検出する場合に比べて、複素数のＯＦＤＭ変調信号の同期信号を検出する場合、相関器の規模がほぼ４倍に膨らむという不利益がある。さらに、ＰＮ符号の場合は、乗算器は実質的に加算回路によって実現でき、非常に簡単な回路構成で実現できるが、複素数であるＯＦＤＭ変調信号の場合、単に加算回路では実現することが困難である。 For example, consider using 32 samples of data as a synchronization signal as an example. When the synchronization signal is composed of PN codes, the correlator can be composed of 32 stages of multiplication circuits of complex numbers and real numbers. On the other hand, if it is configured with the synchronization signals by the OFDM modulation signal, in order to constitute a correlator, it shall be provided a multiplication circuit complex between 32 stages. Therefore, there is a disadvantage that the scale of the correlator expands to about four times when detecting the synchronization signal of the complex number OFDM modulated signal as compared with the case of detecting the synchronization signal of the PN code consisting of only the real part. Further, in the case of the PN code, the multiplier can be realized by an adder circuit and can be realized by a very simple circuit configuration, but in the case of a complex number OFDM modulated signal, it is difficult to realize by a simple adder circuit. is there.
本発明は、かかる事情に鑑みてなされたものであり、その目的は、ＯＦＤＭ変調信号によって同期信号を構成する場合、同期信号の検出を容易に実現でき、検出精度を維持しながら、検出回路の構成を簡素化できる無線送信装置および無線受信装置を提供することにある。 The present invention has been made in view of such circumstances, and an object of the present invention is that when a synchronous signal is configured by an OFDM modulated signal, the synchronous signal can be easily detected, and the detection circuit can be maintained while maintaining the detection accuracy. An object of the present invention is to provide a wireless transmitter and a wireless receiver whose configuration can be simplified.
【００１２】
【課題を解決するための手段】
上記目的を達成するため、本発明の無線送信装置は、複数の無線通信装置からなる無線通信ネットワークにおいて、情報を送信する無線送信装置であって、制御データ及び情報データをＯＦＤＭ変調するデータ変調手段と、同期検出用符号系列をＯＦＤＭ変調し、変調信号のうち所定の部分信号を用いて同期信号を発生する同期信号発生手段と、上記同期信号と制御データと情報データを含むフレームを生成するフレーム生成手段と、上記フレームを送信する送信手段と、を有する。
本発明の無線受信装置は、複数の無線通信装置からなる無線通信ネットワークにおいて、情報を受信する受信装置であって、同期検出用符号系列をＯＦＤＭ変調し、変調信号のうち所定の部分信号を用いて形成される同期信号と、ＯＦＤＭ方式で変調された制御データ及び情報データを含むフレームを受信する受信手段と、上記同期信号を検出する同期検出手段と、を有する。
また、本発明の無線通信システムは、無線通信端末と、上記無線通信端末を制御する無線通信制御端末とを有する無線通信システムであって、上記無線通信制御端末は、データの送受信をＯＦＤＭ方式で行う送信手段及び受信手段と、同期検出用符号系列をＯＦＤＭ変調し、変調信号のうち所定の部分信号を用いて同期信号を発生する同期信号発生手段とを備え、上記無線通信端末は、データの送受信をＯＦＤＭ方式で行う送信手段及び受信手段と、同期信号を検出する同期検出手段と、上記同期検出手段により設定されるタイマ手段とを備え、上記無線通信端末と上記無線通信制御端末との間は、ＯＦＤＭ方式でデータを変調し、所定シンボル数のフレーム構造でＴＤＭＡ方式でデータの多重化を行い、上記無線通信制御端末は、上記フレーム毎に上記無線通信端末に上記同期信号を送信する同期信号送信手段と、上記無線通信端末は、上記同期検出手段によって上記同期信号を検出したタイミングに応じて上記タイマを設定し、上記タイマを基準に送信及び受信タイミングを設定する通信制御手段とを有する。
0012
[Means for solving problems]
In order to achieve the above object, the wireless transmission device of the present invention is a wireless transmission device that transmits information in a wireless communication network composed of a plurality of wireless communication devices, and is a data modulation means for OFDM-modulating control data and information data. A synchronization signal generating means that OFDM-modulates the synchronization detection code sequence and generates a synchronization signal using a predetermined partial signal among the modulated signals, and a frame that generates a frame including the synchronization signal, control data, and information data. It has a generation means and a transmission means for transmitting the frame.
The wireless receiving device of the present invention is a receiving device that receives information in a wireless communication network composed of a plurality of wireless communication devices, and OFDM-modulates a synchronization detection code sequence and uses a predetermined partial signal among the modulated signals. It has a receiving means for receiving a frame including a synchronization signal formed by the above-mentioned, control data and information data modulated by an OFDM method, and a synchronization detecting means for detecting the synchronization signal.
Further, the wireless communication system of the present invention is a wireless communication system having a wireless communication terminal and a wireless communication control terminal for controlling the wireless communication terminal, and the wireless communication control terminal transmits and receives data by an OFDM method. The wireless communication terminal includes a transmission means and a reception means to perform, and a synchronization signal generation means for OFDM-modulating a synchronization detection code sequence and generating a synchronization signal using a predetermined partial signal among the modulation signals. It is provided with a transmitting means and a receiving means for transmitting and receiving by the OFDM method, a synchronous detecting means for detecting a synchronous signal, and a timer means set by the synchronous detecting means, and is between the wireless communication terminal and the wireless communication control terminal. Modulates data by the OFDM method, multiplexes the data by the TDMA method with a frame structure of a predetermined number of symbols, and the wireless communication control terminal transmits the synchronization signal to the wireless communication terminal for each frame. The signal transmission means and the wireless communication terminal include a communication control means that sets the timer according to the timing at which the synchronization signal is detected by the synchronization detection means, and sets transmission and reception timings based on the timer. ..
スイッチ１１０及び１１６は、選択制御信号ＳW に応じて、入力信号を選択する。なお、選択制御信号ＳW は、例えば、通信ユニット１０５のコントローラ２８によって供給される。各フレームの先頭に同期信号を送信する場合、スイッチ１１０によって同期符号系列が選択され、シリアル／パラレル変換回路１１３によって変換され、ＩＦＦＴ回路１１４に入力される。この場合、同期信号発生回路３１によって生成される同期符号は、例えば、図１０に示すデータ系列｛ｘ0 ，ｘ1 ，ｘ2 ，…，ｘ63｝である。当該データ系列がＩＦＦＴ処理後、実数部と虚数部がそれぞれ生成される。 Switches 110 and 116, in response to the selection control signal S W, selects an input signal. The selection control signal SW is supplied by, for example, the controller 28 of the communication unit 105. When transmitting a synchronization signal at the beginning of each frame, the synchronization code sequence is selected by the switch 110, converted by the serial / parallel conversion circuit 113, and input to the IFFT circuit 114. In this case, the synchronization code generated by the synchronization signal generation circuit 31 is, for example, the data series {x 0 , x 1 , x 2 , ..., X 63 } shown in FIG. After the data series is Fourier processed, a real part and an imaginary part are generated, respectively.
【００９６】
【発明の効果】
以上説明したように、本発明によれば、データをＯＦＤＭ方式で送り、１フレームを単位としてＴＤＭＡによりデータ通信を行う。そして、各々のフレームの先頭にＯＦＤＭ波の同期信号を送信する。同期符号に対してＯＦＤＭ変調した符号系列のうち、実数部または虚数部の何れかを用いて同期信号を形成することによって、受信側において、実数の相関演算処理のみで同期信号を検出でき、同期検出回路を簡素化でき、小規模の回路によって同期信号を検出でき、送受信のタイミングを高精度で制御できる利点がある。
[0906]
【Effect of the invention】
As described above , according to the present invention, data is transmitted by the OFDM method, and data communication is performed by TDMA in units of one frame. Then, an OFDM wave synchronization signal is transmitted at the beginning of each frame. By forming a synchronization signal using either the real part or the imaginary part of the code sequence that has been OFDM-modulated with respect to the synchronization code, the synchronization signal can be detected on the receiving side only by the real number correlation calculation processing, and is synchronized. There are advantages that the detection circuit can be simplified, the synchronization signal can be detected by a small-scale circuit, and the transmission / reception timing can be controlled with high accuracy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33073199A JP4206587B2 (en) | 1999-11-19 | 1999-11-19 | Wireless transmission device and wireless reception device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33073199A JP4206587B2 (en) | 1999-11-19 | 1999-11-19 | Wireless transmission device and wireless reception device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2001148680A JP2001148680A (en) | 2001-05-29 |
| JP2001148680A5 true JP2001148680A5 (en) | 2006-05-11 |
| JP4206587B2 JP4206587B2 (en) | 2009-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33073199A Expired - Fee Related JP4206587B2 (en) | 1999-11-19 | 1999-11-19 | Wireless transmission device and wireless reception device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4206587B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7164724B2 (en) * | 2002-09-25 | 2007-01-16 | Matsushita Electric Industrial Co., Ltd. | Communication apparatus |
-
1999
- 1999-11-19 JP JP33073199A patent/JP4206587B2/en not_active Expired - Fee Related
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