JPH07111499A - Method for data transmission and reception - Google Patents

Abstract

PURPOSE:To realize the data transmission with less data error than a data transmission reception method adopting a selection diversity system in which any of received waves from different routes is selected depending on the level of a received electric field. CONSTITUTION:Transmission data sent from a transmission station 1 are received by 1st and 2nd reception means 3a, 3b of a reception station 2 through different transmission lines. Then 1st and 2nd data error detection sections 5a, 5b detect a data error based on data error detection data from 1st and 2nd pre-reception data and an output data selection section 6 selects output data based on both the results of data error check. Then the pre-reception data received by the 1st reception means 3a or the 2nd reception means 3b are obtained as a single reception data signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention, like mobile communications,
Data for improving transmission quality so that data transmission with few errors can be performed even in digital data transmission that is affected by delayed waves and interference waves of other communications depending on the relative positional relationship between the transmitting station and the receiving station. It relates to a transmission / reception method.

[0002]

2. Description of the Related Art When high quality data transmission is required in space transmission using terrestrial waves, a diversity technique is used in which a plurality of received signals having different characteristics are combined or switched to obtain a single signal. There is. As a communication method using this diversity technique, selection diversity is known, which selects the antenna with the highest received electric field from among a plurality of receiving antennas, and is used in automobile phones and the like.

[0003]

However, when data is transmitted by the above-mentioned selective diversity method, at a relatively low transmission rate, the strength / weakness of the received electric field and the goodness / badness of the transmission quality match to some extent, but at a high speed. In the transmission, the reception electric field may temporarily increase due to the influence of delayed waves due to reflection and the like. Therefore, if the route is switched only by the strength of the received electric field, it is not always possible to select a good transmission path, but rather, errors in the received data may increase.

Further, in a communication system having a cell structure in which digital radio communication with a mobile station is performed in each communication area centered on scattered base stations, frequencies used in adjacent areas are set so as not to overlap. However, the same frequency is used in areas that are some distance apart,
Interference waves from other areas may increase the received electric field. Therefore, even in such a case, simply selecting a signal having a high received electric field will increase errors in the received data.

Therefore, the present invention provides a data transmission / reception method capable of properly selecting a received signal even if there is a route in which a received electric field is high due to a delayed wave or an interference wave of another communication. It is intended.

[0006]

In order to solve the above problems, a data transmitting / receiving method according to the present invention transmits a single digital transmission data including information data and data for error detection from a transmitting station (1). Then, at the receiving station (2), the single digital transmission data is received by a plurality of receiving means (for example, the first and second receiving means 3a, 3b) via different transmission paths, and each is received by each receiving means. Data error detection is performed on the pre-reception data based on the data error detection data, and a single reception data is selected based on the data error detection result.

[0007]

By receiving the single digital transmission data transmitted from the transmitting station by the plurality of receiving means, the transmission data can be received through the plurality of routes according to the arrangement structure of the receiving means. Even if an error occurs in the transmission data due to the influence of the delayed wave or the interference wave of other communication in any one of these plural routes, it will be detected by the data error detection performed in the receiving station.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a data transmitting / receiving method according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, it is assumed that one of the two stations is a transmitting station 1 and the other is a receiving station 2 in a two-way communication, and a single digital transmission data including information data and data error detection data from the transmission station 1. Is transmitted, and the transmission data is received by the receiving station 2. Although omitted in FIG. 1, the transmitting station 1 has the function of the receiving station 2 and the receiving station 2 has the function of the transmitting station 1.

The receiving station 2 is designed to receive the data transmitted from the transmitting station 1 by a plurality of antennas arranged at different positions, and a plurality of transmission lines (routes) corresponding to the arrangement structure of these antennas. ), It is possible to obtain a plurality of received signals. In the embodiment shown in the drawings, the first receiving means 3a,
The second receiving means 3b obtains the first pre-received data and the second pre-received data, respectively.

Then, the first and second pre-reception data are respectively supplied from the first and second reception means 3a and 3b to the reception data selection means 4 (shown by a broken line in FIG. 1), and the reception data selection means 4 is supplied. Selects one of the first and second pre-reception data as a single reception data. Note that the present invention is not limited to the embodiment shown in FIG. 1, and three or more receiving means in which antennas are appropriately separated may be provided.

A first data error detecting section 5a and a second data error detecting section 5b are provided in the received data selecting means 4 for detecting errors in the first and second pre-received data, respectively. The first and second data error detection units 5a and 5b output the detection results to the output data selection unit 6, and select the pre-reception data output by the output data selection unit 26 as a single reception data based on the detection results. To do.
If three or more receiving means are provided,
A data error detection unit corresponding to each of the three or more pre-reception data received by each receiving means may be provided. Further, data based on a known existing method such as a parity bit may be used as the data error detection data.

The selection criterion of the received data by the output data selection unit 26 is within the range of the degree of freedom in design, and if there is pre-received data in which no data error has been detected, pre-reception in which no data error has been detected exists. If the data is preferentially selected as the single received data, any selection criteria may be set. For example, when there is only one pre-reception data in which no data error is detected, the output data selecting unit 6 outputs the data error so that the pre-reception data in which no data error is detected is output as a single reception data. A signal indicating that data is output is output to the data error detection unit that has not detected it.

Further, when there are a plurality of pre-reception data in which no data error is detected, the pre-reception data received by any one of the data error detection units is selected in accordance with a predetermined selection order of the data error detection units. It may be output as a single received data. For example, in the case of including the first to fifth receiving means, the selection order when the first to fifth data error detecting units are present is sequentially lowered from the first data error detecting unit to the fifth data error detecting unit. If no data error is detected in the first and second pre-received data, no data error is detected in the first pre-received data and in the second, fourth and fifth pre-received data. In this case, the second pre-reception data will be selected as a single reception data.

Note that the reception data to be selected may be determined based on a random number or the like without presetting the selection order as a selection criterion when an error is not detected in a plurality of pre-reception data. In addition, if there is no pre-reception data in which no data error is detected, either data may be output as single reception data as described above, or the single reception data cannot be specified. Alternatively, the transmitter station 1 may be requested to retransmit the data. Further, in the above embodiment, the case of wireless transmission via an antenna is shown, but the same effect can be expected when a transmission line such as a wire is used.

As described above, if the error detection is performed based on the data error detecting data for each of the plurality of pre-reception data, the reception electric field is temporarily increased due to the influence of the delayed wave and the interference wave of other communication. Even if there is pre-reception data that has become invalid, it is not possible to select it as a single piece of pre-reception data that includes such a data error, so it is possible to perform high-quality data transmission with a simple configuration. Become.

Further, if the number of receiving routes is increased by increasing the number of receiving means, the probability of occurrence of a data error in all pre-received data is extremely small if the transmission path quality is good to some extent. Send and receive data. It should be noted that as the number of receiving means increases, an arrangement structure or the like for appropriately separating the receiving means is required, and the processing speed of data error detection and output data selection for each pre-received data must be increased. The structure of is complicated and becomes relatively large. Therefore, 2-3
The structure of the receiving station with some degree of receiving means is realistic.
In addition, when transmitting and receiving voice data of a mobile telephone or the like, even if there is a data frame containing a data error, there is practically no problem, so it is rare that a data error is detected from all pre-received data. Even in this case, it can sufficiently contribute to the improvement of the transmission quality.

[0018]

As described above, according to the data transmitting / receiving method of the present invention, a single digital transmission data transmitted from the transmitting station is received by a plurality of receiving means via a plurality of routes. Therefore, even if an error occurs in the transmission data due to the influence of the delayed wave or the interference wave of the other communication in any of the plurality of routes, it will be detected by the data error detection performed in the receiving station. Therefore, even if there is a route in which the received electric field is high due to the delayed wave or the interference wave of other communication, it is possible to select the appropriate received data without selecting such pre-received data as a single received data. By selecting the pre-reception data having a high probability as a single reception data, it is possible to realize high-quality data transmission.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing a basic concept of data transmission / reception according to the present invention.

[Explanation of symbols]

 1 transmitting station 2 receiving station 3a first receiving means 3b second receiving means 4 received data selecting means 5a first data error detecting section 5b second data error detecting section 6 output data selecting section

Claims (3)

[Claims] 1. A single digital transmission data including information data and data for error detection is transmitted from a transmission station,
At the receiving station, the single digital transmission data is received by a plurality of receiving means via different transmission paths, and data error detection is performed on each pre-received data received by each receiving means based on the data error detection data. A data transmission / reception method characterized in that a single received data is selected based on a data error detection result. 2. When the result of the data error detection based on the data for data error detection is only one pre-reception data in which no data error is detected, the pre-reception data is selected as a single reception data. The data transmission / reception method according to claim 1, wherein the data transmission / reception method is performed. 3. As a result of data error detection based on the data error detection data, when there are a plurality of pre-reception data in which no data error is detected, no data error is detected according to a predetermined selection order. 2. The data transmission / reception method according to claim 1, wherein any one of the pre-reception data is selected as a single reception data.