KR20130029012A - Method and apparatus for transmitting and receiving data streams in a wireless system - Google Patents

Abstract

PURPOSE: A data stream transmission and reception method and a device thereof are provided to execute a mapping for logical channels of additional physical layer slots according to the construction of a logical channel defined as a single input or multiple input encoding methods. CONSTITUTION: A reception unit receives data streams. A control unit maps the received data streams on an additional physical slot. The control unit constructs one or more frames including the additional physical slot. A transmission unit transmits the one or more frames through one or more wireless frequencies. The additional physical slot includes bit information which indicates the number of antennas transmitting the one or more frames. [Reference numerals] (50) Slot generation process; (52) Serial/parallel conversion and mapping process; (54) T-wise frequency interleaving process; (56) Pilot insertion process; (58) Fast Fourier conversion and protective section(+P1) insertion; (AA) MISO encoding; (BB) Space-frequency encoding

Description

METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA STREAMS IN A WIRELESS SYSTEM}

The present invention relates to wireless communication systems, and more particularly, to a method and apparatus for transmitting and receiving data streams in a wireless communication system.

A wireless system such as a digital video broadcasting system may transmit data in the form of a sequence of frames assigned to a frame structure. Digital video broadcasting systems generally follow digital video broadcasting standards, and examples of digital video broadcasting standards include the Digital Video Broadcasting (DVB) standard, the Advanced Televisions Systems Committee (ATSC) standard, and integrated service digital. An Integrated Services Digital Broadcasting (ISDB) standard or a Digital Multimedia Broadcasting (DMB) standard. In general, each frame includes a preamble section and a data section, wherein the preamble section and the data section are multiplexed in the time domain. The data section may be configured in the form of a plurality of data streams, also referred to as physical layer pipes (PLP). For example, the PLP may deliver a service such as a video channel provided to a user. Data or data streams from the frames are received using signaling information. The signaling may also be referred to as physical layer signaling or layer 1 (L1) signaling. The signaling may indicate a modulation scheme or a coding scheme used to receive data. The signaling may indicate, for example, sections of a data field to be decoded or information required for data reception such as the location of data streams within the data section. Can direct them.

Referring to the DVB standard, digital video broadcast standard frame structures may provide physical slots within the DVB physical frame structure. For example, the terrestrial standard broadcast DVB-T2 (Digital Video Broadcasting Terrestrial Second ^Generation ) has a superframe structure composed of a plurality of frames, and has a slot not transmitting the DVB-T2 signal in the superframe or each frame. have. This is called a future extension frame (FEF). As an example, FEF slots may be provided in addition to parts of the frame structure for transmission of signals to be received by general fixed DVB receivers.

For the transmission of signals, schemes have been proposed for using additional physical slots, such as the FEF slots, for example for the transmission of signals such as signals received by portable receivers. As an example, UK patent application GB 1100901.6 relates to a system in which data streams can be mapped to logical frames, which can be mapped to a sequence of additional physical slots for forming a logical channel transmitting the data streams. . The sequence of additional physical slots may comprise slots in a transmission sequence of one or more radio frequency channels.

There is also a need to transmit a data stream encoded using a multi-transmitter encoding scheme, such as the Multiple Input Multiple Output (MIMO) encoding scheme or the Multiple Input Single Output (MISO) encoding scheme. Can be.

However, not all radio frequency channels in the radio system may be allocated for transmission from multiple antennas, and the number of antennas allocated for transmission may vary among radio frequency channels. Thus, when a data stream encoded using a multi-transmitter encoding scheme is mapped to a logical channel formed from additional physical slots within a transmission sequence of one or more radio frequency channels, the multi-transmitter encoding used by the data stream The scheme does not correspond to the number of transmit antennas and / or multi-transmitter encoding scheme used in at least some radio frequency channels. As a result, limitations may arise in the formation of logical channels, for example a limitation in that the logical channel may be formed only from radio frequency channels using the same multi-transmitter encoding scheme as the data stream. It may be.

The present invention provides a method and apparatus for transmitting and receiving data streams in a wireless system.

In a wireless system according to the present invention, a method for transmitting data streams includes receiving data streams, mapping the received data streams to additional physical slots, and at least one frame including the additional physical slots. And transmitting the at least one frame through at least one radio frequency, wherein the additional physical slot includes bit information indicating the number of antennas transmitting the at least one frame. It is done.

In addition, the apparatus for transmitting data streams in the wireless system according to the present invention comprises a receiving unit for receiving the data streams, mapping the received data streams to an additional physical slot, and configuring at least one frame including the additional physical slot. And a transmitter for transmitting the at least one frame through at least one radio frequency, wherein the additional physical slot includes bit information indicating the number of antennas for transmitting the at least one frame. do.

In addition, the method for receiving data streams in a wireless system according to the present invention includes the steps of receiving at least one frame through at least one radio frequency, obtaining a position of an additional physical slot of each frame, And receiving data streams allocated to additional physical slots present in the location, wherein the additional physical slots include bit information indicating the number of antennas transmitting the at least one frame.

In addition, the apparatus for receiving data streams in the wireless system according to the present invention, the receiving unit for receiving at least one frame through at least one radio frequency, and confirm the position of the additional physical slot of each frame, And a control unit for acquiring data streams allocated to an existing additional physical slot, wherein the additional physical slot includes bit information indicating the number of antennas transmitting the at least one frame.

1 schematically illustrates the operation of mapping logical frames to physical slots;
2 schematically illustrates the operation of mapping logical channels to RF frequencies in accordance with an embodiment of the present invention;
3 schematically illustrates the operation of mapping logical channels to RF frequencies in accordance with another embodiment of the present invention;
4 is a diagram schematically illustrating an operation of mapping antenna groups to a logical frame according to an embodiment of the present invention;
5 schematically illustrates a frame generation process according to an embodiment of the present invention;
6 schematically illustrates a frequency interleaving operation according to an embodiment of the present invention;
7 schematically illustrates a signaling scheme according to an embodiment of the present invention;
8 schematically illustrates a signaling scheme according to another embodiment of the present invention;
9 schematically illustrates signaling stages according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

Embodiments of the present invention will be described by taking the context of a Digital Video Broadcasting Next Generation Handheld (DVB-NGH) system as an example. Additional data that are received DVB-NGH receiver in the DVB-NGH system is transmitted in the second generation DVB-T2 system FEF slot in the ground (2 ^nd generation terrestrial DVB-T2).

However, embodiments of the present invention are described by taking the DVB-NGH system as an example, and may be applied not only to the DVB-NGH system but also to other wireless broadcasting systems or wireless communication systems such as unicast / multicast systems. Of course you can. Furthermore, embodiments of the present invention are, of course, not limited to use for transmission of digital video signals.

1 is a diagram schematically illustrating an operation of mapping logical frames to physical slots.

Referring to FIG. 1, digital video broadcast frame structures, eg, a DVB-T2 system, may be provided for FEF slots 2a, 2b, 2c in a transmission sequence of a radio frequency channel. The FEF slots may also be referred to as an FEF part or an FEF part. The FEF slots 2a, 2b, 2c occupy physical slots in the DVB physical frame structure and are not used for transmission of the DVB-TS signal and are reserved for future use. The FEF slots 2a, 2b, 2c may be added to T2-frames, which are parts of a frame structure for transmission of signals to be received by general DVB-T2 receivers as shown in FIG.

In addition, schemes have been proposed in which handheld receivers, such as DVB-Next Generation Handheld (NGH) receivers, use FEF slots in which existing DVB-T2 data is not transmitted for transmission of signals to receive. In particular, as described in UK patent application GB 1100901.6 and as shown in FIG. 1, data streams, such as PLPs, can be mapped to logical frames 4a, 4b, and the logical frames 4a, 4b. ) May be mapped to a sequence of additional physical slots, such as FEF slots 2a, 2b, 2c, to form a logical channel for transmitting the data streams. The sequence of FEF slots 2a, 2b, 2c may include slots in a transmission sequence of one or more radio frequency channels. As shown in FIG. 1, when there are three FEF slots, a logical NGH frame 4a is transmitted in at least two or more parts, in which case the length of the logical NGH frame 4a is the FEF slot. It may be larger than the length of the (2a, 2b, 2c). In the case of the logical frame, i.e., the logical NGH frame 4a, signaling information on the data capacity when the length of the logical frame is limited by the length of additional physical slots, in particular FEF slots 2a, 2b, 2c. It can be arranged to have a lower ratio. The two or more FEF slots may be present in a transmission sequence for other radio frequency channels, and the logical frames may be identical even if the length of the additional physical slots in the sequence of additional physical slots is changed between the radio frequency channels as an example. It is arranged to have a length.

As shown in FIG. 1, a particular logical frame 4a generally contains signaling information and data, which signaling information generally comprises sections, i.e., P1 sections 6a, 6b and an L1-pre section. 8a, 8b, L1-config section 10, and L1-dynamic section 12. The data sections 14, 16, 18 comprise PLPs. For example, the PLPs may overlap in the time domain and may be multiplexed in the frequency domain.

The L1 config section 10 is a section in which L1-config signaling information is transmitted, and the L1-config signaling information generally transmits valid information to each frame of a subframe including a plurality of frames, and the L1 config section ( The information conveyed through 10) is generally the same as the information for each logical frame of the super frame. The L1-dynamic information generally changes from a logical frame to a logical frame and includes information for decoding the PLP within the logical frame. In general, the L1-dynamic information may include, for example, a start address of the PLP.

It may also be desirable to transmit a data stream encoded using a multi-transmitter encoding scheme, such as the MIMO encoding scheme or the MISO encoding scheme. However, not all radio frequency channels in the radio communication system may be allocated for transmission from multiple antennas, and the number of antennas allocated for transmission may vary among radio frequency channels.

2 is a diagram schematically illustrating an operation of mapping logical channels to RF frequencies according to an embodiment of the present invention.

Referring to FIG. 2, the first radio frequency channel RF ₁ 20 has two antennas (Nt = 2, where Nt represents the number of antennas). Alternatively, each of the second radio frequency channel RF ₂ 22 and the third radio frequency channel RF ₃ 24 has one antenna. In this case, the first logical channel LNC ₁ 26 is allocated for delivering data streams using a multi-transmitter encoding scheme M1xO, i.e., a multi-transmitter encoding scheme such as a MIMO encoding scheme or a MISO encoding scheme. Each of the second logical channel LNC ₂ 28 and the third logical channel LNC ₃ 30 may be a single transmitter encoding scheme (SIxO), that is, a single input multiple output (SIMO) encoding scheme and a SISO encoding scheme. It is allocated to deliver data streams using the same single transmitter encoding scheme.

In one embodiment of the invention, a first set of data streams, for example a first set of data streams such as PLPs, form several radios for forming a first logical channel for transmitting the first set of data streams. Mapped to a first series of logical frames within frequency channels. Here, the first series of logical frames is mapped to a first sequence of additional physical slots, eg, a first sequence of additional physical slots, such as FEF slots. The logical channel may also be referred to as a logical NGH channel (LNC). The first set of data streams may have a MIMO encoding scheme and a multi-transmitter encoding scheme such as an MISO encoding scheme. However, the first set of all the data streams need not have a multi-transmitter encoding scheme. In addition, the first set of at least one data stream may have a multi-transmitter encoding scheme for a different number of transmit antennas than the first set of other data streams. The first series of logical frames is transmitted in a first sequence of additional physical slots using the same pilot pattern for each of the first sequence of additional physical slots and each of the first set of data streams. Sharing the same pilot pattern between data streams with different multi-transmitter encoding schemes allows the first set of data streams to be mapped to the same logical channel. Further, the first pilot pattern is selected to be suitable for the multi-transmitter encoding scheme used by any one of the first set of data streams requiring the maximum number of pilot tones, so that each of the data streams is each multi- According to the transmitter encoding scheme, for example, channel estimation may be efficiently performed.

In one embodiment of the invention, a second set of data streams is mapped to a second series of logical frames within several radio frequency channels to form a second logical channel for transmitting the second set of data streams. do. Here, the second series of logical frames is mapped to a second sequence of additional physical slots. The second series of logical frames is transmitted in a second sequence of additional physical slots using a second pilot pattern that is different from the pilot pattern used to transmit the first series of logical frames. In addition, the second series of logical frames is transmitted in a second sequence of additional physical slots using the same pilot pattern for each second sequence of additional physical slots and each second set of data streams.

In at least one additional physical slot of the second sequence of additional physical slots, at least one additional physical slot of the first sequence of additional physical slots may be a time slot in the transmission sequence of the same radio frequency channel. In this way, additional physical slots on the same radio frequency channel can be arranged to use different pilot patterns. This means that even though the data streams carried by one logical channel have an encoding scheme that uses a pilot pattern that is different from the pilot pattern used by the data streams carried by another logical channel, the two logical channels are the same radio frequency. It makes it possible to use additional physical slots in the channel's transmission sequence. It may also be possible to supply logical channels without limitation that the logical channel should only be formed from radio frequency channels using the same encoding scheme, eg the same multi-transmitter encoding scheme. Logical channels can be formed using radio frequency channels, wherein the radio frequency channels are multi-transmitter encoding schemes different from the multi-transmitter encoding schemes used for data streams to be transmitted using the logical channel in terms of the number of transmitters. Can be allocated for In general, the pilot pattern used in the radio frequency channel may be determined according to the multi-transmitter encoding scheme used in the radio frequency channel and the number of useful transmitters.

The first sequence of additional physical slots is a number of antennas as large as the maximum number of transmit antennas required by the multi-transmitter encoding scheme used by at least one of the plurality of antennas, the first set of data streams. To be arranged for transmission by them. Thus, each of the data streams may operate according to each multi-transmitter encoding scheme in each of the additional physical slots used for a logical channel for transmission of the data streams. In one embodiment of the present invention, the mapping for the first series of logical frames of the first set of data streams is arranged such that an integer number of space-time code blocks of a multi-transmitter encoding scheme can be mapped to each OFDM symbol, thus Space-time code blocks are not split, and elements of each of the space-time code blocks are kept in the same ODFM symbol. This maintains the efficiency of the space-time coding in terms of error rate performance, such as a signal-to-noise ratio function. In addition, the mapping of the first set of data streams to the first series of logical frames includes the use of the first set of data streams for each OFDM symbol to which the first set of data streams is mapped. Arranged to have the same number of data subcarriers as an integer multiple of the least common multiple of length. This allows an integer number of space-time code blocks of the multi-transmitter encoding scheme to be mapped to each OFDM symbol, so that no space-time code blocks need to be separated between OFDM symbols. Here, when the space-time code blocks are separated between OFDM symbols, coding efficiency may be reduced. The mapping of the first set of data streams to the first series of logical frames is arranged such that frequency interleaving may result in mapping to consecutive data subcarriers of a particular space-time code block in a multi-transmitter encoding scheme. The efficiency of space-time coding, for example, the efficiency of space-time coding such as aspects of error rate performance, such as signal-to-noise ratio function can be maintained. The contiguous data subcarriers are contiguous before insertion of pilot tones, and the pilot tones can basically be inserted between two of the contiguous data subcarriers.

In one embodiment of the present invention, the second pilot pattern is selected to be suitable for the encoding scheme used by at least one of the second set of data streams requiring the maximum number of pilot tones and thus the first logical channel. And each of the second logical channels may be arranged to use each pilot pattern suitable for the set of data streams being conveyed. Each second set of data streams may be arranged for SISO transmission. In this case, the pilot pattern used for the second logical channel may be suitable for SISO transmission, and the SISO transmission may generally include a smaller number of pilot tones, and thus a larger number for data transmission. It is possible to allocate subcarriers.

Hereinafter, the embodiments of the present invention will be described in more detail.

Multiple Input, Single or Multiple Output (MIXO) encoding schemes and Single Input, Single or Multiple Output (SIXO) encoding schemes can be multiplexed to provide logical channels. The logical channels may be referred to as "Logical NGH Channels (LNCs)." In addition, possible approaches at the slot level include defining MIXO or SIXO. This is motivated by the presence of L1-pre in each slot, which is L1-pre signaling the pilot pattern used in the additional physical slot. As a result, the logical frame, which may be logical NGH frames (LNFs), is composed of a plurality of slots and may have different MIXO parts or SIXO parts. As a result, this approach enables one LNF to have different pilot patterns, and since one PLP allows it to span across two slots, different pilot patterns will affect the same PLP. Can be; This may in turn reduce transmission efficiency. In contrast to this approach at the slot level, in one embodiment of the present invention, multiplexing of MIXO and SIXO can be performed at the LNC level, so that a pilot pattern can be defined at the LNC level. This can provide efficient multiplexing without affecting the flexibility of allowing several PLPs to become SIXOs, so that several PLPs can be assigned to the SIXO LNC.

Next, multiplexing of MISO PLP and MIMO PLP in a specific logical channel will be described. In one embodiment of the invention, the same pilot pattern is applied to MISO and MIMO, the pilot pattern being determined by a larger number of transmit antennas of the encoding schemes used by the PLPs. In order to provide flexibility in the selection of the optimal MIXO scheme for each PLP, the P2 symbols can use different MIMO schemes, so that different PLPs (signaling or data) can be carried in the P2 symbol (total). Or in part). To do this, at least use of a pairwise cell interleaver is required, so that the cells are not divided. The pairwise cell interleaver may be used more generally when the pairing is extended to two or more cells. With the formation of logical channels, the framing structure has an additional stage for slot generation, mapping cells to the slots, and taking into account this stage to perform the cell interleaving.

In one embodiment of the invention, the logical channel (LNC) enables the receiver to receive all of the above services / PLPs multiplexed at the LNC with a single tuner. If the service is transmitted through multiple PLPs, i.e. using SVC, all the PLPs of the service can be transmitted in the same LNC, and one or more tuners are required to receive multiple associated PLPs in different LNCs. May be required. Further, in one embodiment of the present invention, when the LNC includes a PLP using MIXO, the pilot pattern used through the entire LNC is selected to support the MIXO. When the pilot method used in the LNC is MIXO, the multiplexing of SIXO and MIXO in the same LNC may be avoided because the pilot method and pilot pattern used for MIXO may be inefficient compared to the case where SIXO is applied. In one embodiment of the invention, all NGH slots, i.e. additional physical slots, mapped to the MIXO LNC have the same number of transmit antennas Nt. The pilot pattern used in the LNC is generally defined in the L1-Pre part of the preamble at the start of each NGH slot.

FIG. 2 is a diagram schematically illustrating a first example of the operation of assigning additional physical layer slots to three logical channels (LNC) 26, 28, 30 in three radio frequency channels. As shown in FIG. 2, there are a total of three radio frequency channels, RF ₁ (20), RF ₂ (22), and RF ₃ (24), with one of the three radio frequency channels being two With transmit antennas Nt = 2, two of the three radio frequency channels have one transmit antennas Nt = 1. When the SIXO LNC uses a slot in RF with two transmit antennas, the SIXO transmit encoding scheme for transmissions from multiple antennas, such as the eSFN encoding scheme, is such that the encoding using a single transmit antenna is obtained from two transmit antennas. The transmission may be used to be used for transmission from two transmission antennas, for example when two antennas must be used. (A total of three slots are shaded in FIG. 2). If the eSFN does not want to suppress transmission from any of the antennas, for example to prevent power fluctuations between transmission antennas, the antenna Encoding method for SIXO when it is not desired to suppress transmission from any of these. The eSFN is transparent to the receiver and therefore generally does not need to inform the receiver via separate signaling of the use of the eSFN.

3 shows three radio frequency channels 32, 34 and 36, two of the three radio frequency channels having two transmit antennas (Nt = 2), the three radio frequency channels One of them is a diagram schematically showing an operation according to an embodiment of the present invention when having one transmit antenna (Nt = 1). 3 shows two logical channels, LNC ₁ 38, which is a logical channel carrying MIXO data streams, and LNC ₂ 40, which is a logical channel carrying SIXO data streams. In addition, the shaded slots in FIG. 3, ie slots with reference numeral 42, are for the transmission of SIXO using two antennas, and thus can be eSFN encoded.

4 schematically illustrates a MIMO case. The logical channel (LNC) and logical frame (LNF) 48 are applied in a similar manner to the application for SIXO. The start of the LNF 48 and the length of L1-Post are signaled in the L1-Pre parts of the logical frame. The number of data cells in the LNF 48 is generally fixed and signaled in L1-Post. The LNF 48 is mapped to antenna groups 1 44 and antenna groups 2 46 for transmission.

5 shows a slot generation process 50, a serial / parallel conversion and mapping process 52, a T-wise frequency interleaving process 54, a pilot insertion process 56, in accordance with an embodiment of the present invention; A sequence diagram schematically illustrating a process including a fast Fourier transform and guard interval and a P1 insertion process 58. For each antenna, a cell stream including NUM_CELLS_NGH_FRAME cells is generated for each LNF.

In the case of the Alamouti encoding scheme, the SF codewords c (l) input to the slot generation process 50 may be expressed as the following equation.

For enhanced spatial multiplexing (SM), the SF codewords may be shaped as shown in the following equation.

Considering the space-frequency encoding block, the 3xN hybrid scheme may use SF codewords as shown in the following equations.

(1) 3xN rate 1 Alamauthi encoding scheme + QAM modulation scheme:

(2) 3xN rate 3/2 L3-code:

(3) 3xN Rate 2 UTU Hybrid:

In a general case, a MIMO codeword using a space-frequency block encoding scheme may provide a codeword having a size as shown in the following equation.

In the above equation, Q represents the number of cells encapsulated in the same SF codeword. Thus, the codeword will have a size N _t * T, where N _t represents the number of transmit antennas and T represents the number of cells on the channel that should always be constant (or as many as possible). In addition, the spatial rate is obtained like T / Q.

Next, referring to FIG. 5, there are a plurality of PLPs, each of which uses a SIxO / MIxO encoding scheme, and a pilot pattern by a PLP using a maximum number of transmit antennas N _tmax . When determined, the operation of the serial / parallel conversion and mapping process 52 according to an embodiment of the present invention will be described.

After performing spatial frequency encoding on the PLPs, cells generated after the XIXO encoding are separated according to the antenna group. This process is handled by a serial / parallel conversion process in which N _t consecutive elements / cells are separated into different paths.

In order to allow a serial / parallel process to be performed independently of the spatial frequency encoding, the spatial frequency codewords can be extended to N _tmax * T by inserting rows with "0s" during the encoding processes.

As shown in FIG. 6, after cells in each spatial frequency codeword have been correspondingly separated (ie, serial / parallel converted) to the antenna group (step 60), cells from each antenna group have T _max = mcm ( T ( i )), i = 0 ... grouped into M blocks to have a relationship such as NMU_PLP-1. Here, each of the M blocks includes T _max cells. Next, the M number of blocks may be mapped to each of the cells in each slot, one slot is C _p2 * N and P2 symbols of _p2 cells, the N _data of data OFDM symbols of the C _p2 * N _p2 cells and C _pc * 1 is formed by an optional slot adjacent to the cells. The mapping of the M blocks may be performed first in the frequency direction (column-wise) and then in the time direction. In an embodiment of the present invention, the number of blocks mapped per (column-wise) OFDM symbol may be expressed by an integer as shown in the following equation.

Z, 여기서, Z는 정수이다.{ C _P2 , C _data , C _FC } / T _max

Z, where Z is an integer.

Since the cells are mapped to the slots, T- wise frequency interleaving can be performed even if the interleaving is applied through blocks of T _max cells. It should be noted that the pair-wise interleaving 62 is shown in FIG. 6 assuming T = 2. (On the other hand can be extended to any integer example in addition to two or more in Fig. 6.) T _max of the pilot tone insertion blocks (64a, 64b) pilot tones, each block of cells is adjacent subcarriers before being inserted in the, general data Mapped to a contiguous block of subcarriers. 6 shows the case where T _max = 2. 6 shows space-time codewords located in consecutive blocks. It should be noted that in Figure 6 the components of a particular codeword are spelled the same. After pilot tone insertion 64a, 64b, a fast Fourier transform is generally performed, and guard intervals are inserted 66a, 66b.

In order to extract information from received signals considered L1 signaling and data PLP, the receiver needs to know the number of antennas used for transmission as well as the T _max value used during T-wise frequency interleaving. In general, these two parameters, the T _max value used during the T-wise frequency interleaving, and the number of antennas used for transmission are correlated, and not all combinations are possible, therefore, as shown in FIG. The same signaling format may be used. 7 shows a case in which transmission is performed using up to two antennas, and the number of bits required for signaling the information is two. 7 shows a case in which transmission is performed using up to three antennas, and the number of bits required for signaling the information is three. This case may be included in hybrid terrestrial / satellite transmission (TER / SAT).

Assuming n _S3 bits are needed, the n _S3 bits may be signaled during the P1 symbol of the starting FIG. 1 as shown in FIG. 8. In another embodiment of the present invention, all the useful bits for the signaling are NGH 4+ _S3 n bits may be combined into a single word, the n 4+ _S3 bit single words FFT size and a guard interval and a waveform and a transmission It can be used to signal the number of antennas and all possible combinations of T-wise parameters.

In accordance with an embodiment of the present invention, signaling is arranged to indicate to the receiver the type of spatial frequency encoding used for different associated PLPs, which is illustrated in FIG. 9. P1 signaling 90 is generally transmitted at the start of the FEF slot. For L1-Pre block 92, the MIMO encoding scheme is fixed and corresponds to the maximum number N _tmax of transmitters. As an example, one may assume that SIXO encoding is used when Ntmax = 1, and that Alamauti encoding is used when Ntmax = 2, and 3xN rate 1 Alamau when Ntmax = 3 It can be assumed that tee + QAM encoding is used. In one embodiment of the present invention, the MIMO encoding of L1-Post is signaled in the L1-Pre as three bits that can be designated L1_POST_MIMO. The MIMO encoding of each PLP may be signaled in the PLP loop of the L1-Post 94 configurable part, designated PLP_MIMO (3 bits) 96.

Thus, in embodiments of the present invention, the mapping of the additional physical layer slots to the logical channel depends on the configuration of the logical channel considered as a single input or multiple input encoding scheme. In embodiments of the present invention, additional physical layer slots may be used in which the logical channel has at least the same number as the maximum number of transmit antennas used in MIMO encoding. In addition, a single pilot pattern can be used for the entire logical channel adapted to the maximum number of transmit antennas. A method of multiplexing PLPs of different MIMO encoding schemes has been described in different MIMO encodings, where each PLP includes the L1 signaling. It has been described that mapping MIMO codewords to slots enables T-wise frequency interleaving, and the T-wise frequency interleaving scheme may be based on T2 frequency interleaving sequences. It has been described that the L1 signaling scheme enables the receiver to detect the MIMO configuration of each logical channel (LNC) and to extract MIXO / SIXO data streams (PLPs).

In the above description, specific specific embodiments are shown, which are provided to help a more general understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details. will be. Those skilled in the art to which the present invention pertains may modify or alter the present invention in various forms within the spirit and scope described in the claims herein. While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

Claims (40)

A method of transmitting data streams in a wireless system, the method comprising:
Receiving data streams;
Mapping the received data streams to additional physical slots;
Constructing at least one frame including the additional physical slot; And
Transmitting the at least one frame through at least one radio frequency;
And the additional physical slot includes bit information indicating the number of antennas transmitting the at least one frame. The method of claim 1, wherein the data streams are broadcast data streams for a handheld terminal. The method of claim 1, wherein the mapping process,
Mapping the received data streams to at least one logical frame; And
Mapping each of the at least one logical frame to two or more additional physical slots. The method of claim 3, wherein the additional physical slot,
And signaling information for receiving data streams mapped to the additional physical slot. The method of claim 4, wherein the signaling information includes P1 information, L1-pre information, and L1-post information.
The L1-post information includes L1-config information and L1-dynamic information. 6. The method of claim 5, wherein the bit information is included in the L1-config information. 6. The method of claim 5, wherein the P1 information and the L1-pre information are allocated to each additional physical slot. 6. The method of claim 5, wherein the L1-config information and the L1-dynamic information are disposed at each front portion of the at least one frame. The method of claim 5, wherein the at least one logical frame forms a logical channel, transmits the at least one frame over two or more radio frequencies, and wherein there are two or more logical channels.
One logical channel is set as the primary logical channel and the other logical channel is set as the secondary logical channel, and the L1-config information and the L1-dynamic information are disposed in front of the logical frames of the main logical channel. And the L1-dynamic information is disposed at every front part of the logical frames of a logical channel. 10. The method of claim 9, wherein the logical channel comprises one or more super frames, the super frame is composed of a plurality of frames, the L1-config information is further disposed in front of the super frames of the sub- logical channel Method of transmitting data streams, characterized in that. An apparatus for transmitting data streams in a wireless system, the apparatus comprising:
A receiver for receiving data streams;
A controller configured to map the received data streams to additional physical slots and to configure at least one frame including the additional physical slots; And
It includes a transmitter for transmitting the at least one frame through at least one radio frequency,
And the additional physical slot includes bit information indicating the number of antennas transmitting the at least one frame. 12. The apparatus of claim 11, wherein the data streams are broadcast data streams for a handheld terminal. 12. The apparatus according to claim 11,
Map the received data streams to at least one logical frame,
And map each of the at least one logical frame to two or more additional physical slots. The method of claim 13, wherein the additional physical slot,
And signaling information for receiving data streams mapped to the additional physical slot. The method of claim 14, wherein the signaling information includes P1 information, L1-pre information, and L1-post information.
The L1-post information includes L1-config information and L1-dynamic information. 16. The apparatus of claim 15, wherein the bit information is included in the L1-config information. 16. The apparatus of claim 15, wherein the P1 information and the L1-pre information are allocated to each additional physical slot. 16. The apparatus of claim 15, wherein the L1-config information and the L1-dynamic information are disposed at each front portion of the at least one frame. The method of claim 15, wherein the at least one logical frame forms a logical channel, transmits the at least one frame over two or more radio frequencies, and wherein there are two or more logical channels.
One logical channel is set as the primary logical channel and the other logical channel is set as the secondary logical channel, and the L1-config information and the L1-dynamic information are disposed in front of the logical frames of the main logical channel. And the L1-dynamic information is arranged at each front of logical frames of a logical channel. 20. The method of claim 19, wherein the logical channel comprises one or more super frames, the super frame consists of a plurality of frames, and the L1-config information is further disposed in front of the super frames of the sub logical channel. Apparatus for transmitting data streams, characterized in that. A method of receiving data streams in a wireless system, the method comprising:
Receiving at least one frame over at least one radio frequency;
Obtaining a position of an additional physical slot of each frame;
Receiving data streams allocated to additional physical slots existing at the obtained location;
And the additional physical slot includes bit information indicating the number of antennas transmitting the at least one frame. 22. The method of claim 21, wherein the data streams are broadcast data streams for a handheld terminal. The method of claim 21, wherein receiving the data streams comprises:
Forming a logical frame of one of the two or more logical frames using data allocated to two or more additional physical slots; And
Extracting data streams from the two or more logical frames. The method of claim 23, wherein the additional physical slot,
And signaling information for receiving data streams allocated to the additional physical slots. The method of claim 24, wherein the signaling information includes P1 information, L1-pre information, and L1-post information.
The L1-post information includes L1-config information and L1-dynamic information. 27. The method of claim 25, wherein the bit information is included in the L1-config information. 27. The method of claim 25, wherein the P1 information and the L1-pre information are allocated to each additional physical slot. 26. The method of claim 25, wherein the L1-config information and the L1-dynamic information are disposed at each front portion of the at least one frame. 26. The method of claim 25, wherein the at least one logical frame forms a logical channel, transmits the at least one frame over two or more radio frequencies, and wherein there are two or more logical channels,
One logical channel is set as the primary logical channel and the other logical channel is set as the secondary logical channel, and the L1-config information and the L1-dynamic information are disposed in front of the logical frames of the main logical channel. And the L1-dynamic information is arranged at each front of logical frames of a logical channel. 30. The method of claim 29, wherein the logical channel comprises one or more super frames, the super frame consists of a plurality of frames, and the L1-config information is further disposed in front of the super frames of the sub logical channel. Method of receiving data streams, characterized in that. An apparatus for receiving data streams in a wireless system, the apparatus comprising:
A receiver for receiving at least one frame through at least one radio frequency;
A controller for identifying a position of an additional physical slot of each frame and obtaining data streams allocated to the additional physical slot existing at the identified position;
And the additional physical slot includes bit information indicating the number of antennas transmitting the at least one frame. 32. The apparatus of claim 31, wherein the data streams are broadcast data streams for a handheld terminal. The method of claim 31, wherein the control unit,
Form a logical frame of one of the two or more logical frames using the data allocated to the two or more additional physical slots,
And extract data streams from the two or more logical frames. The method of claim 33, wherein the additional physical slot,
And signaling information for receiving data streams allocated to the additional physical slots. The method of claim 34, wherein the signaling information includes P1 information, L1-pre information, and L1-post information.
The L1-post information includes L1-config information and L1-dynamic information. 36. The apparatus of claim 35, wherein the bit information is included in the L1-config information. 36. The apparatus of claim 35, wherein the P1 information and the L1-pre information are allocated to each additional physical slot. 36. The apparatus of claim 35, wherein the L1-config information and the L1-dynamic information are disposed at each front portion of the at least one frame. 36. The method of claim 35, wherein the at least one logical frame forms a logical channel, transmits the at least one frame over two or more radio frequencies, and wherein there are two or more logical channels,
One logical channel is set as the primary logical channel and the other logical channel is set as the secondary logical channel, and the L1-config information and the L1-dynamic information are disposed in front of the logical frames of the main logical channel. And the L1-dynamic information is arranged at each front of logical frames of a logical channel. 40. The method of claim 39, wherein the logical channel comprises one or more super frames, the super frame consists of a plurality of frames, and the L1-config information is further disposed in front of the super frames of the sub logical channel. Apparatus for receiving data streams, characterized in that.

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