KR20060120483A - Wireless communication using a repeater - Google Patents

Abstract

A radio communication system using relays is provided to enable a source to directly transmit the first information part to the destination through radio communication, and at the same time, enable the source transmit the second information part to relays for delivering the information to the destination. A source divides information(codeword) into at least the first part(to destination) and the second part(to relay). The source directly transmits the first part(to destination) to the destination, while at the same time the source delivers the second part(to relay) to radio stations(relay1,relay2) for wirelessly delivering the second part(to relay) to the destination.

Description

Wireless communication using a repeater {RADIO COMMUNICATION USING RELAYS}

1 is a diagram illustrating one section of a wireless communication system.

2A is a table illustrating first message partitioning in accordance with the present invention.

2B is a table illustrating a second message partition according to the present invention.

3 is a table showing progression over a first time of message transmission according to the present invention.

4 is a table showing progress over a second time of message transmission in accordance with the present invention.

* Description of the major symbols in the drawings *

SOURCE: transmitter

DESTINATION: Receiver

CODEWORD: information

RELAY 1 and RELAY 2: Radio stations carrying information

TO DESTINATION: the first part of the information

TO RELAY: the second part of the information

TO DESTINATION 2: The third part of the information

TO RELAY 2: Fourth part of the information

The present invention relates to a method for wirelessly transmitting information from a transmitter to a receiver. The invention also relates to a transmitter and a wireless communication system for performing the method.

In a wireless communication system, messages including, for example, voice information, image information, video information, Short Message Service (SMS), Multimedia Messaging Service (MMS) or other data are transmitted via an interface between a transmitting station and a receiving station using electromagnetic waves. do. In this case, the station may be various types of subscriber-side radio stations or network-side radio devices such as repeaters or wireless access points or base stations, depending on the specific design of the wireless communication system. At least a portion of the subscriber-side radio station in the mobile radio communication system is a mobile radio station. Radiation of electromagnetic waves consists of carrier frequencies that lie within the frequency bands provided for each system.

Mobile wireless communication systems are often UMTS (Universal Mobile Telecommunications System) with a network infrastructure consisting of, for example, the Global System for Mobile Communication (GSM) standard or, for example, base stations, base station supervision and control devices, and additional network-side devices. It is formed as a cellular system according to the standard. Besides such hierarchical hierarchical cellular wireless networks, there are usually Wireless Local Area Networks (WLANs) with wireless coverage that is much more strictly limited in space. Examples of various standards of WLANs include HiperLAN, DECT, IEEE 802.11, Bluetooth, and WATM.

Wireless stations can communicate directly with each other only if they are within wireless coverage of each other. If direct communication is not possible, message transmission between the stations may be via other stations acting as relays (delivering messages). Message delivery in such a manner may be performed by the subscriber station according to the specific design of the wireless communication system, or may be performed by the network side radio station. The message may, for example, be communicated over a WLAN between a wireless access point and a subscriber radio station remote from the wireless access point. Even in the Adhoc mode of a wireless communication system, subscriber stations can communicate with each other through one or more hops or multihops without the need for a relay device, such as a base station or a wireless access point.

It is an object of the present invention to introduce a radio communication method in which a radio station with a transfer function is used and a transmitter and a radio communication system for performing such a method.

This object is achieved through a method having the features of claim 1 and an apparatus having the features of dependent claims. Preferred embodiments and refinements are set forth in the dependent claims.

In a method according to the invention for wirelessly transmitting information from a transmitter to a receiver, the transmitter divides the information into at least a first part and a second part. According to the invention the transmitter wirelessly transmits the first part of the information directly to the receiver and at the same time the second part of the information is sent to the radio station for delivery to the receiver.

As the transmitter, network-side devices such as, for example, UMTS, GSM, WiMAX or WLAN systems are used. It is particularly preferred that mobile subscriber stations be used as receivers. The radio station on which the second piece of information is transmitted is used at least in particular for the transfer of information, in which case a network side or subscriber side repeater is used.

The transmitter has information divided by the transmitter into various parts, and divided into at least a first part and a second part. The information may be channel coded information, for example, for the purpose of wireless transmission. The information partitioning is preferably made such that there is no overlap between the two information parts, i.e. there is no information element which is a component of the first information part and also a component of the second information part. The information may be completely partitioned, in which case there is no information component that is not a component of the first and / or second information portion. Alternatively, information partitioning may be such that the first information portion and the second information portion are combined to form at least one information component that does not form complete information and is not a component of the first information portion and / or the second information portion. have. As the two pieces of information remain different from each other, when the information is divided, contents transmitted directly from the transmitter to the receiver are different from contents transmitted from the transmitter to the receiver through the radio station. The information can be divided into a plurality of first information portions and a second information portion, in which case the method according to the invention can be applied to a plurality of first information portions and second information portions.

It is preferable that the same radio technology is used for the radio transmission between the transmitter and the receiver and the radio transmission between the transmitter and the radio station, eg the same radio standard. This radio technology can also be used for transmission between stations and receivers.

In a refinement of the invention, the transmitter performs a pre-distortion technique of the first information portion and the second information portion before performing the transmission, wherein the radio channels between the transmitter and the receiver and between the transmitter and the radio station are Information is used. With predistortion, in particular, the receiver substantially receives the first information portion and the radio station receives substantially the second information portion so that the two pieces of information do not need to be separated at the receiver side. As a predistortion technique, a dirty paper precoding technique is preferably used.

According to one preferred embodiment of the present invention, information segmentation comprises puncturing of channel coded messages. Redundancy is added to the information through channel coding. The puncturing causes components to fall off, reducing the length of the message, for example, removing every nth bit from the message. Partitioning by puncturing may be done in such a way that the first information portion consists of a punctured message and the second information portion consists of the punctured and removed message components.

Preferably the receiver first receives the first part and then receives the second part to combine them. This allows information on the two parts to be obtained at the receiver side.

It is desirable for the transmitter to comprise a plurality of transmit antennas, where directional transmissions to the receiver of the first part and directional transmissions to the radio station of the second part take place. It is also desirable for the receiver to include multiple receive antennas to separate signals received simultaneously from multiple directions.

In a refinement of the invention, the second information portion is transmitted from the radio station to the receiver while the third information portion of the information is transmitted from the transmitter to the receiver. In this case, the transmission by the transmitter and the radio station does not have to be done at exactly the same time, but rather in the manner of overlapping when the two pieces of information are received by the receiver.

According to another refinement of the invention, the second information portion is transmitted from the radio station to the receiver and at the same time the third information portion is transmitted directly from the transmitter to the receiver, and further before the fourth information portion is transferred from the transmitter to the receiver. Transmitted to the station. Since the radio station and further radio stations are preferably located in different places, there are different radio channels between the radio station and the receiver and between the additional radio station and the receiver.

In an embodiment of the present invention, a method is performed in which a receiver separates portions of information simultaneously received using information on a radio channel between a transmitter and a receiver and a radio channel between a radio station and a receiver.

A transmitter according to the present invention for transmitting information wirelessly comprises means for dividing information into at least a first portion and a second portion, and for transmitting the first portion directly to a receiver while simultaneously transmitting the second portion to a receiver. Means for transmitting to the radio station.

Furthermore, the receiver according to the invention is particularly suitable for performing predistortion of the first information portion and the second information portion using information on radio channels between the transmitter and the receiver and radio channels between the transmitter and the radio station before transmission. The means and / or the first information portion may comprise a plurality of transmit antennas for radiating to the receiver and the second information portion for radiating to the radio station.

A wireless communication system according to the invention comprises at least one transmitter, a receiver and a radio station for information transfer. The wireless communication system also includes means for dividing information into at least a first portion and a second portion, and a first information portion directly through a transmitter to a receiver and simultaneously to a wireless station for transferring the second information portion to a receiver. Means for delivering said second information portion to a receiver via a radio station, and means for receiving said first and second information portions and combining said two information portions via a receiver.

The transmitter according to the invention and the wireless communication system according to the invention are particularly suitable for carrying out the method according to the invention and can also be applied to embodiments and improvements. To this end the transmitter and the wireless communication system according to the invention may comprise further suitable means.

Hereinafter, the present invention will be described in more detail with reference to Examples.

The section of the wireless communication system shown in FIG. 1 includes radio stations SOURCE, DESTINATION, RELAY 1 and RELAY 2. The radio station SOURCE is preferably a base station of a cellular wireless communication system or a wireless access point of a WLAN. The radio station DESTINATION is preferably a subscriber-side radio station, such as a mobile phone or a mobile computer of a user of a wireless communication system. It is assumed that a message is transmitted from the station SOURCE to the station DESTINATION. This message transmission can be made directly as indicated by the arrow between the station SOURCE and DESTINATION. Message transmission from station SOURCE to station DESTINATION can also be made via station RELAY 1 and RELAY 2, indicated by an arrow between station SOURCE and station RELAY 1 and RELAY 2 and an arrow between station RELAY 1 and RELAY 2 and station DESTINATION. It is. In this regard, the station SOURCE sends the message to one of the stations (RELAY 1 or RELAY 2), which forwards the message to the station DESTINATION. The transmitting radio stations RELAY 1 and RELAY 2, which are preferably fixed in place, may be network side radio stations or subscriber side radio stations.

Before the message is transmitted from the radio station SOURCE to the radio station DESTINATION, the radio station SOURCE encodes the message, for example, via convolutional coding. Such channel coding adds redundancy information to the message. According to the top row of FIGS. 2A and 2B, after encoding, a code word CODEWORD having BIT 1, BIT 2, BIT 3, BIT 4, BIT 5, BIT 6, BIT 7 and BIT 8 as components is generated. . The code word CODEWORD is divided into a "TO RELAY" portion and a "TO DESTINATION" in accordance with the third row of Figs. 2A and 2B by the radio station SOURCE according to the second row of Figs. 2A and 2B. The "TO RELAY" part, i.e. components BIT2, BIT4, BIT6 and BIT8 of CODEWORD in Figure 2A and components BIT3 and BIT6 in Figure 2B, are transmitted to one of the two stations (RELAY 1 or RELAY 2). It is prescribed to be. Another "TO DESTINATION" part of the CODEWORD, i.e. components BIT1, BIT3, BIT5 and BIT7 for Figure 2A and BIT1, BIT2, BIT4, BIT5, BIT7 and BIT8 for Figure 2B from the station SOURCE It is specified to be sent directly to DESTINATION. The "TO RELAY" part and the "TO DESTINATION" part do not overlap each other, and together form a complete code word (CODEWORD). Therefore, the station SOURCE transmits different information to each station RELAY 1 or RELAY 2 on one side and to the station DESTINATION on the other side.

The code word CODEWORD is preferably divided into a "TO RELAY" part and a "TO DESTINATION" part through puncturing. That is, for example, every nth bit may be punctured from the codeword CODEWORD, and the "TO RELAY" portion is formed of the punctured bits, and the "TO DESTINATION" portion is the punctured codeword CODEWORD. This is made up. FIG. 2A illustrates a case where every second component of the codeword CODEWORD is punctured, and FIG. 2B illustrates a case where every third component is punctured.

The "TO RELAY" part and the "TO DESTINATION" part undergo additional encoding for the purpose of interference cancellation before being transmitted (pre-interference cancellation). For this purpose, a so-called dirty paper precoding technique is preferably used, which is described, for example, by G. Caire, S. Shamai, “On the Achievable Throughput of a Multiantenna Gaussian Broadcast Channel” (IEEE Transactions on information). Theory, Vol. 49, No. 7, July 2003).

In this additional encoding, the station SOURCE uses information on the radio channel between the station SOURCE and the station DESTINATION on one side and the information on the radio channel between the station SOURCE and the stations RELAY 1 and RELAY 2 on the other hand. Use Through predistortion, the "TO RELAY" part and the "TO DESTINATION" part may be transmitted simultaneously by the radio station source, that is, the two parts ("TO RELAY" part and "TO DESTINATION" part) are overlapped and transmitted. Substantially receives each "TO DESTINATION" part, and each of the stations RELAY 1 and RELAY 2 substantially receives each "TO RELAY" part.

When the "TO RELAY" part is received by each of the stations RELAY 1 and RELAY 2, the two stations transmit the "TO RELAY" part to the station DESTINATION. Thus, the station DESTINATION first receives the "TO DESTINATION" part directly from the station SOURCE, and then receives the "TO RELAY" part from each of the station RELAY 1 and RELAY 2. When the two parts ("TO RELAY" part and "TO DESTINATION" part) are received, the radio station DESTINATION combines them. By combining two portions of the code word ("TO RELAY" portion and "TO DESTINATION" portion), the radio station DESTINATION can obtain the entire codeword (CODEWORD).

3 shows a process of transmitting a message from a radio station SOURCE to a radio station DESTINATION. The second column of the two blocks of FIG. 3 represents message transmission during the first time slot T1, the third column represents message transmission during the second time slot T2, and the fourth column is third The message transmission during time slot T3 is shown, and the fifth column shows message transmission during fourth time slot T4.

Assuming that both stations RELAY 1 and RELAY 2 are designed to not receive and transmit messages simultaneously, to transmit a message from a station SOURCE to a station DESTINATION using one of the two stations (RELAY 1 or RELAY 2). As shown in the upper block of FIG. 3, two time slots may be used. Line 2 of the upper block shows message transmission from station SOURCE to station DESTINATION, line 3 shows message transmission from station SOURCE to station RELAY 1 or RELAY 2, and line 4 shows station from station RELAY 1 or RELAY 2 Indicates message transfer to DESTINATION. During time slot T1, the station SOURCE sends the first part (TO DESTINATION 1) directly to the station DESTINATION and the second part (TO RELAY 1) to the station RELAY 1 or RELAY 2. During a subsequent time slot T2, each radio station RELAY 1 or RELAY 2 delivers a second portion TO RELAY 1 to the radio station DESTINATION. During the time slot T2, the station SOURCE does not transmit any signal to each station RELAY 1 or RELAY 2, because the station RELAY 1 or RELAY 2 cannot receive due to transmission of the "TO RELAY 1" part. Because. In the next time slot T3, the radio station SOURCE transmits the third portion TO DESTINATION 2 directly to the radio station DESTINATION, and transmits the fourth portion TO RELAY 2 to each of the radio stations RELAY 1 or RELAY 2. In the next time slot T4, each radio station RELAY 1 or RELAY 2 delivers a fourth portion (TO RELAY 2) to the radio station DESTINATION. Therefore, four time slots are required to transmit four (information) parts, where the station SOURCE does not transmit every second time slot. This "pause" of the station SOURCE divides the data throughput into two. In the case of the method described based on the upper block of FIG. 3, the division of the code word according to FIG. 2A, that is, the division of the data stream into the "TO RELAY" and "TO DESTINATION" portions is preferably made 1: 1. .

The lower block of Figure 3 represents one preferred method for increasing the data transfer rate. The first row of the lower block shows the message transmission from the station SOURCE to the station DESTINATION, the second line shows the message transmission from the station SOURCE to the station RELAY 1 or RELAY 2, and the third line shows the station from the station RELAY 1 or RELAY 2 Indicates message transfer to DESTINATION. The first time slot T1 is used as in the upper block of FIG. 3, where the radio station SOURCE sends the first portion TO DESTINATION 1 directly to the radio station DESTINATION, and sends the second portion TO RELAY 1 to the radio station RELAY 1 or Send to RELAY 2. During the subsequent time slot T2, each radio station RELAY 1 or RELAY 2 passes the second portion TO RELAY 1 to the radio station DESTINATION, as in the upper block of FIG. The radio station SOURCE transmits the third portion TO DESTINATION 2 directly to the radio station DESTINATION without interrupting message transmission during time slot T2. The transmission of the fourth and fifth parts (TO DESTINATION 3, TO RELAY 3), and the sixth part (TO DESTINATION 4) is performed by the TO DESTINATION 1, TO RELAY 1, and TO DESTINATION 2 parts in the time slots T1 and T2. Corresponds to the transmission. The lower block of FIG. 3 shows that four time slots are needed to transmit six parts from the station SOURCE to the station DESTINATION. In the case of the method described based on the lower block of Fig. 3, the division of the code word according to Fig. 2b, that is, the division of the data stream into the "TO RELAY" part and the "TO DESTINATION" part is suitably made 2: 1. .

While station DESTINATION in the top block of FIG. 3 is receiving from station SOURCE or from each station RELAY 1 or RELAY 2, simultaneously from station SOURCE in time slots T2 and T4 or each station RELAY 1 in the bottom block of FIG. Or a signal originating from either RELAY 2 is received by the station DESTINATION. In order to allow the "TO DESTINATION 2 and TO RELAY 1" part of time slot T2 or the "TO DESTINATION 4 and TO RELAY 3" part of time slot T4 to be separated from each other, the station DESTINATION uses a multi-user detection technique. Do this. In this case, the radio station DESTINATION uses radio channel information between radio station SOURCE and radio station DESTINATION on one hand and radio channel information between each radio station RELAY 1 or RELAY 2 and radio station DESTINATION on the other hand. Multi-user detection techniques are described, for example, in A.D. By Wyner, "Recent Results in the Shannon Theory" (IEEE Transactions on Information Theory, Vol. IT-20, No. 1, January 1994).

Another time-dependent process of message transmission that a radio station SOURCE can transmit in each time slot is shown in FIG. In this case, both stations RELAY 1 and RELAY 2 are used to convey the message part. The second column of FIG. 4 shows message transmission during the first time slot T1, the third column shows message transmission during the second time slot T2, and the fourth column shows the third time slot T3. Message transmission during the fourth time slot T4. The second row of FIG. 4 shows the message part received by the radio station relay 1, the third row shows the message part transmitted or transmitted by the radio station relay 1, and the fourth row shows the message part received by the radio station relay 2 The fifth row shows the portion of the message sent or forwarded by the station RELAY 2. Line 6 shows the message part received by the radio station DESTINATION.

During time slot T1, station RELAY 1 receives the first portion (TO RELAY 1) from station SOURCE. Since the radio station SOURCE directly transmits the second part TO DESTINATION 1 to the radio station DESTINATION, the radio station DESTINATION receives the second part TO DESTINATION 1 in time slot T1. The station RELAY 1 transfers the first portion (TO RELAY 1) from the time slot T2 to the station DESTINATION. In time slot T2, station RELAY 2 receives a third portion (TO RELAY 2) from the station SOURCE. The radio station SOURCE transmits the third part (TO RELAY 2) to the radio station RELAY 2 and simultaneously transmits the fourth part (TO DESTINATION 2) to the radio station DESTINATION. In other words, the station DESTINATION receives both message portions (TO DESTINATION 2 and TO RELAY 2) in time slot T2. In time slot T3, the station RELAY 2 transfers the third portion (TO RELAY 2) to the station DESTINATION. At the same time, the station RELAY 1 receives the fifth portion (TO RELAY 3) from the station SOURCE in time slot T3. The radio station SOURCE transmits the sixth part TO DESTINATION 3 directly to the radio station DESTINATION in the third time slot T3. Thus, the station DESTINATION receives the third portion TO RELAY 2 from the radio station RELAY 2 in the third time slot T3 and receives the sixth portion TO DESTINATION 3 from the radio station SOURCE. During the fourth time slot T4, the radio station SOURCE transmits the seventh portion (TO RELAY 4) to the radio station RELAY 2 and the eighth portion (TO DESTINATION 4) directly to the radio station DESTINATION. The station DESTINATION receives an eighth part (TO DESTINATION 4) and a fifth part (TO RELAY 3) delivered by the station RELAY 1 in a fourth time slot.

Therefore, the radio station SOURCE alternately transmits to radio station relay 1 and radio station relay 2. The station SOURCE sends another portion of information directly to the station DESTINATION at the same time as the transmission. Station DESTINATION receives signals from station SOURCE and station RELAY 1 at the same time on one side and alternately from station SOURCE and station RELAY 2 on the other side. In the case of the method described based on Fig. 4, the division of the data stream into the "TO RELAY" part and the "TO DESTINATION" part is preferably made 1: 1.

According to Fig. 4, when the radio station relay 1 transmits, the radio station relay 2 receives it, and conversely, when the radio station relay 1 receives it, the radio station relay 2 transmits. Therefore, the transmission of the station RELAY 1 interferes with the reception of the station RELAY 2 and vice versa, the transmission of the station RELAY 2 causes the interference of the reception of the station RELAY 1. To avoid or avoid this effect, message parts transmitted from the station SOURCE to the stations RELAY 1 and RELAY 2 are predistorted according to the dirty paper precoding technique. For this purpose, the station SOURCE uses information on the radio channel between the station SOURCE and the station RELAY 1 and the information on the radio channel between the station SOURCE and the station RELAY 2 and the information of the message parts transmitted by the transmitting station RELAY 1 or RELAY 2.

Both transmitter-side signal separation and receiver-side signal separation are improved through the use of multiple transmit and receive antennas, as this entails additional space diversity. If the station SOURCE comprises, for example, a plurality of transmit antennas, the directional transmission in the direction of each radio station RELAY 1 or RELAY 2 in the "TO RELAY" message part and in the direction of the station DESTINATION in the "TO DESTINATION" message part are Can be done. Thereby, the message parts do not have to be separated, for example by predistortion via dirty paper precoding, or at least the quality of signal separation caused by the predistortion can be improved. Since the same applies to the receiver, the station DESTINATION can result in improved separation of the message parts received simultaneously from either the station SOURCE and the station RELAY 1 or RELAY 2 through the use of multiple receive antennas.

Through the present invention, there is provided a radio communication method in which a radio station serving a transmission function is used, and a transmitter and a radio communication system for performing such a method.

Claims (13)

A method of wirelessly transmitting information (CODEWORD) from a transmitter (SOURCE) to a receiver (DESTINATION), The transmitter SOURCE divides the information CODEWORD into at least a first part TO DESTINATION and a second part TO RELAY, The transmitter SOURCE transmits the first portion TO DESTINATION directly to the receiver DESTINATION and simultaneously transmits the second portion TO RELAY to the receiver DESTINATION wirelessly. Sent to RELAY 2), Wireless information transmission method. The method of claim 1, The transmitter SOURCE uses the information on the radio channels between the transmitter SOURCE and the receiver DESTINATION and between the transmitter SOURCE and the radio stations RELAY 1 and RELAY 2 before performing the transmission. Performing a pre-distortion technique of the first information portion (TO DESTINATION) and the second information portion (TO RELAY), Wireless information transmission method. The method of claim 2, As the predistortion technique, a dirty paper precoding technique is used. Wireless information transmission method. The method according to any one of claims 1 to 3, The puncturing of the channel coded message is included in the division of the information CODEWORD. Wireless information transmission method. The method according to any one of claims 1 to 4, The receiver (DESTINATION) first receives the first portion (TO DESTINATION), then receives a second portion (TO RELAY), and combines the first portion (TO DESTINATION) and the second portion (TO RELAY) , Wireless information transmission method. The method according to any one of claims 1 to 5, The transmitter (SOURCE) comprises a plurality of transmit antennas, the directional transmission of the first portion (TO DESTINATION) to the receiver (DESTINATION) and to the radio stations (RELAY 1, RELAY 2) of the second portion (TO RELAY) Directional transmission takes place, Wireless information transmission method. The method according to any one of claims 1 to 6, A second portion (TO RELAY) of the information (CODEWORD) is transferred from the radio stations (RELAY 1, RELAY 2) to the receiver (DESTINATION), while a third portion (TO DESTINATION 2) is received from the transmitter (SOURCE). Sent to receiver DESTINATION, Wireless information transmission method. The method according to any one of claims 1 to 6, The second part (TO RELAY) of the information (CODEWORD) is transmitted from the radio stations (RELAY 1, RELAY 2) to the receiver (DESTINATION), while the third part (TO DESTINATION 2) is directly from the transmitter (SOURCE). Transmitted to the receiver (DESTINATION), and a fourth portion (TO RELAY 2) is transmitted to additional radio stations (RELAY 1, RELAY 2) for transmission from the transmitter (SOURCE) to the receiver (DESTINATION), Wireless information transmission method. The method according to any one of claims 1 to 8, Information simultaneously received by the receiver DESTINATION using information about the radio channel between the transmitter SOURCE and the receiver DESTINATION and the radio channel between the radio stations RELAY 1 and RELAY 2 and the receiver DESTINATION. How to separate the (CODEWORD) parts, Wireless information transmission method. As a transmitter for transmitting information (CODEWORD) wirelessly, Means for dividing the information (CODEWORD) into at least a first portion (TO DESTINATION) and a second portion (TO RELAY), Means for transmitting the first portion TO DESTINATION directly to the receiver DESTINATION while simultaneously transmitting the second portion TO RELAY to the receiver DESTINATION to a radio station RELAY 1, RELAY 2; Included, Transmitter for wireless information transmission. The method of claim 10, The first information portion using information about radio channels between the transmitter SOURCE and the receiver DESTINATION and radio channels between the transmitter SOURCE and the radio stations RELAY 1 and RELAY 2 before transmission Means for performing predistortion of the TO DESTINATION and the second information part TO RELAY, Transmitter for wireless information transmission. The method according to claim 10 or 11, wherein The first information portion TO DESTINATION radiates to the receiver DESTINATION, and the second information portion TO RELAY comprises a plurality of transmit antennas for radiating to the radio stations RELAY 1, RELAY 2; Transmitter for wireless information transmission. A wireless communication system comprising at least one transmitter (SOURCE), a receiver (DESTINATION) and a radio station (RELAY 1, RELAY 2) for information transfer, Means for dividing the information CODEWORD into at least a first part TO DESTINATION and a second part TO RELAY, In order to transmit the first part TO DESTINATION directly to the receiver DESTINATION through the transmitter SOURCE, and to transmit the second part TO RELAY to the receiver DESTINATION, the radio station RELAY 1, Means for transmitting to RELAY 2), Means for delivering the second portion TO RELAY to the receiver DESTINATION via the radio stations RELAY 1, RELAY 2; Means for receiving the first portion TO DESTINATION and the second portion TO RELAY through the receiver DESTINATION, and combining the first portion TO DESTINATION and the second portion TO RELAY. Including, Wireless communication system.

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