TWI378660B - Method and apparatus for interference cancellation in a wireless communications system - Google Patents

Description

1378660

IX. Description of the Invention: [Technical Field to Which the Invention Is Applicable] More specifically, the present invention relates generally to wireless communication interference removal. [Prior Art] There are many techniques for sharing a communication channel among a plurality of users. Examples of such techniques include coded multidirectional proximity (CDMA), orthogonal frequency division multiplexing (OFDM), timed multidirectional proximity (TDMA), and others.

In some communication systems, such as in CDMA, multiple streams from multiple users (or even a single user) are superimposed on each other and received simultaneously. The superposition of these multiple data streams will cause interference. & Decodes a specific data stream for a user, which can be decoded by treating other data streams as a benefit stream. In some systems, when the data stream is decoded, the machine is reconstructed and fed back to reduce its contribution to the augmented or aggregated received signal before subsequent stream decoding. This technique is known to eliminate interference in succession and improve channel utilization. It may be impractical to implement existing techniques for successively eliminating interference. For example =, before all signals can be decoded, a relatively large amount of data usually has to be buffered. The size of the 6-Hair Buffer may be economically unrealistic due to cost and power. In addition, the evaluation of a relatively large amount of data can be depleted and complicated. In addition, when the anti-interference flow is implemented in the ancient error zone Du Tian in the error rate environment, the case is not properly decoded and the data stream used for the elimination + error n μ may increase the error. ', in some systems', if using type II mixed forward _26.doc

1378660 Error Correction/Automatic Repeat Request (System of Type π Hybrid FEC/ARQ or "HARQ") A plurality of data sub-packets having different puncture patterns are successively transmitted to and stored in the receiver. Before the data is correctly decoded, several sub-packets stored can be combined in the receiver. Once properly decoded by a particular sub-packet, it should not only be eliminated from the current stream, but should also be eliminated from the previous stream stored in its interfering memory. In particular, when used with a multiple-input multiple-output (ΜΙΜΟ) system, the amount of memory consumed for the previous transfer of the stored sub-packets may be relatively large. In addition, • The task of managing such data streams can be complex and difficult to implement in practice. For these and other reasons, prior art techniques for successively eliminating interference are insufficient. SUMMARY OF THE INVENTION In one embodiment, the receiver, the present invention includes a receiver/equalizer

The configuration is used to successively cancel the interference generated in the nth data stream by decoding the data stream to the decoded data stream n-1. Regardless of the decoded data stream ^ to the decoded data stream η-1 successively eliminated

Corresponding to one receiving data stream _. Contains: one with one signal input and output, one of each signal output: and one configured for detecting and decoding 109l26.doc 1378660 from the balance consultation\ The signal is output to regenerate the N data streams.

Provided - an interference cancellation feedback loop configured to successively cancel interference generated in the nth data stream by decoding, ', machine-to-decode data stream n'. The decoder is configured to use linear equalization without interference cancellation and to decode all of the signal outputs and to store the result of linear equalization decoding. 1 Decode H (4) is configured for (4) interfering phase (4) measurement and decoding These streams of data flow 2 to rogue. In addition, if the stored data is passed through the error checking processing procedure and the error checking processing program is decoded by using the data for eliminating interference, (4) decoding is configured to select the unused data for eliminating interference (4) to eliminate interference storage. data. In an example, a method of decoding a received data stream superimposed with each other includes performing successive cancellation interference decoding to decode at least some of the ν data streams, regardless of whether the decoding is erroneously eliminated. In another embodiment, the method of reducing the erroneous spread in successively canceling the interfering receiver comprises attenuating the feedback signal by a _ multiplication coefficient between 〇 and 丨. A communication system in accordance with an embodiment of the present invention can include a transmitter device including two or more antennas configured to transmit individual data streams, one including one or more configured to receive individual data streams The receiver device of the antenna 'and an equalization and decoder circuit configured to receive signals from the or the antennas and to generate individual streams of decoded output data. In these embodiments, a disturbing feedback loop is also provided, which is configured to perform interference cancellation using a decoded output data stream that does not pass the error checking handler. 0 109l26.doc 1378660

In another embodiment, a communication device includes one or more antennas, an equalizer, a decoder, and means for performing successive interference cancellation using a received data stream that has not passed the error checking process. [Embodiment] FIG. 1 is an example of a system in which an embodiment of the present invention can be implemented. The base station 12 transmits information intended for use by a plurality of mobile stations 14, such as mobile phones, notebook computers, personal digital assistants (PDAs), wireless electronic mail devices, or other wireless voice and/or data devices. Other terms used to describe the mobile station 14 include "remote station" or "user station". The information that can be communicated has a wide variety of types including, but not limited to, system information, voice data, graphics, email messages, multimedia. Information for archives and the like. Different embodiments will be described in a system with receive diversity and transmit diversity, which is referred to as a multiple input multiple output or "MIM" channel. However, the advantages described herein can also be applied to single-input multiple-output (SIM〇) channels or

Multiple input single output (MISO) channels, and used in non-diversity antenna systems. Figure 2 is an example of a successive interference cancellation (SIC) system illustrated in a system having a team transmit antenna and a team receive antenna. Or multiple antennas. A transport stream from each of the Nt antennas and superimposed over time and each of the Nr receiving antenna teams and the team can be one of the data is received at each of the spaces. Data stream or "stream", data from a specific transmission antenna in this document. In some embodiments, the data stream may correspond to a hybrid type forward error correction/automatic retransmission request (HARQ) for independent type. Processing data - or multiple consecutive transmission sub-packets. 109126.doc 1378660 Multiple transmission antennas are common in mobile systems, each of which contributes a transmission antenna, such as MIM〇, MIS (^sim〇) The system may include multiple antennas without multiple users, as spatial diversity with multiple antennas improves reception characteristics such as effective channel rate. Additionally, although illustrated as a parallel circuit for ease of illustration, Figure 2 Some or all of the blocks may be reused and are typically implemented as a digital data processing function by a firmware in a general purpose digital signal processor or the like. It should be understood that the receiving system of FIG. 2 may be at the base station 12, Implemented in the mobile station 14 or both. Each received stream from each of the team receiving antennas is converted from a RF down to a fundamental frequency (or converted to an intermediate frequency (IF)) by a demodulator η, a magical legacy By analogy, the digital (A/D) converter 24 converts to digital form for storage. The down conversion processing program also includes low pass or band pass (four) and low noise amplifiers. The sample buffer (4) stores the digital data corresponding to the superimposed stream received by each antenna. Since each of the team transmission streams is superimposed in space and time, the team transport streams interfere with each other. Further clarification will be made below for the Nt transport stream. After decoding the data, the transport stream can be reconstructed and the corresponding interference can be eliminated from the sample buffer by the path indicated by the minus sign (1). The spatio-temporal receive/equalizer 28 includes a signal from each of the transmit antennas to each of the receive antennas. A weighted filter for channel feature determination. Receive/equalizer 28 has Nr rounds and team outputs. Receive/equalizer 28 is typically a Minimized Mean Square Error (MMSE) filter, although other filters may be used. The soft decision wheel of the receiver/equalizer 28 is provided as a 109126.doc •10_ input to the decoding circuit 3 and provides the HARQ memory 34 with the function as described above: bucket HARQ memory The content of 34 corresponds to the most recently transmitted sub-packet. The resource is combined with the sub-package of the previous limb, the packet is not decoded, and the decoding process is performed on the combined HARQ sub-packet. The acknowledgment/decoder 38 may include detection circuitry for handing in hard symbols, forward error correction decoding, and the like. For example, the decoding of the forward error correction code may include techniques such as the Viterbi algorithm. To decode a convolutional code. After decoding, the error checking circuit 42 determines whether the decoded data is successfully solved. For example, the error checking circuit 42 can cause (4) a ring code (crc). As shown in FIG. 2, successively canceling interference can be performed. In some embodiments, it is performed to verify whether the hard symbol is properly decoded. This processing procedure is referred to herein as a visual/distraction interference, and it is different from conventional interference cancellation, which is performed only when the hard symbol has been determined to be correctly decoded. When each transmission stream is decoded, The hard decision output is fed to the signal reconstruction circuit 44. The coded and modulated data is reconstructed by the tDF number reconstruction circuit 44 when the coding and modulation data are used by the transmission antennas to decode the hard decision resources (4). Estimating each transmission path using the channel transfer function (represented by block 46), each successive signal appearing approximately in each of the connected antennas is reconstructed, and within the sample buffer % before decoding the next-sequential stream Subtracted from the information. In one embodiment, the interference cancellation performed without proper verification of decommissioning is attenuated before being subtracted from the sample buffer. This attenuation may cause errors to spread due to the subtraction of improper reconstruction signals. In an embodiment, prior to subtraction, the reconstructed stream is attenuated by a multiplier 47 having a pure coefficient of 0. 可 and I09l26.doc. The reliability coefficient can be based on the accuracy of the monitoring decoding. Sexually and adaptively change. This can reduce the spread of errors if the feedback signal is established with incorrectly decoded data. In the embodiment of Figure 2, the decoded hard symbols are processed and used sequentially, regardless of whether the CRC indicates a successful match. Elimination of interference. This technique is referred to herein as blind 消除 elimination. Although this technique may not provide complete interference cancellation, this technique can provide the benefit of eliminating interference decoding. Especially when implementing a harq-k protocol, Λ can significantly simplify the succession. Eliminating the construction of the interference circuit and/or reducing the processing load used to successively cancel the interference calculation, and making the implementation practical. [Relatively, the conventional interference cancellation scheme uses only decoding hard when decoding hard symbols through the CRC check. Symbols, which have the potential to provide more precise interference cancellation - can also take significantly more complex processing to eliminate interference in multiple previously saved streams, and eliminate Significantly more memory. When performing the elimination without passing the CRC check, the transmitter appropriately controls the data transmission rate to make the first-sub-packet error probability relatively low. In this case, even if the frame is not Checking the bit error rate by CRC is usually small, thus limiting the error spread caused by incorrect decoding, which is important for achieving good results with blinded cancellation handlers. Adaptive modulation and coding are used in communication systems. In this case, the rate of all such streams can be independent. Zhou Yu can achieve the above effect. If the receiver properly reports the channel quality (CQI), then the appropriate data transmission rate can also be controlled by the receiver. Figure 3 is a flow chart illustrating the &quot ' Without departing from the spirit and scope of the invention. For example, different portions of the graphical processing program may be combined, rearranged in an alternate order, removable and A similar modification begins. The process begins with receiving data at block 50. See Figure 51 for the following steps of the flow chart of Figure 3 being performed successively on each stream. At the block (9), the original poor sample is equalized to produce a set. A soft symbol for the stream. In this example, the 'receive data packet is for the HARQ process, and some of the received leans may include a HARQ retransmission. This is determined at block 69.

For HARQ retransmission, the harq content previously stored for the first class is combined with the most recently received HARQ sub-packet at block 7〇. The HARQ data for the stream is approximately combined if necessary, and the frame is decoded at block 72. The decoded hard symbol is re-encoded and subtracted from the receive buffer at block 74 without checking if the frame passed the CRC check. At block 76, a crc check is performed. If the frame passes, the HARQ buffers are vacated for the stream in block (4), then the system typically sends an acknowledgment "ACK" to the transmitter to indicate successful receipt of the frame and the handler moves to the termination state 8". If the crc fails, then the receiver can request a subsequent job packet at block 77, and the system proceeds to the termination state 8〇, ready for additional data reception. Figure 4 illustrates a method for canceling interference according to a second embodiment of the present invention. In this embodiment, in addition to the above, the table (5) ^ ^ In addition to the components described above with reference to Figure 2, the car, first The storage location of the memory is not only accompanied by ', but the interference is eliminated after successive eliminations ==, _, the storage location of the output is at 84j =, the equalization _ output is -1 is the elimination of dry == the processing of the disturbance is reduced. More than the undisappeared production 1 126.doc -13- 1378660 is even worse, all of which are profitable. The device of Figure 4 can be used to select the better of the interference cancellation or non-cancellation interference when one of the operations is known to be better by an error check processing procedure indication. In particular, this approach can be beneficial when the system uses a simple error correction coding that requires low decoding complexity. An example embodiment of this is further illustrated by the flow chart of FIG. The procedure of Figure 5 contains many of the same steps as those set forth in the flow chart of Figure 3, and the steps of the S-Temple are numbered accordingly. The processing program is further opened by receiving data in block 5. Equalization is performed on the original data samples at block 52. Similarly, in this example, the accepted data packet is for a Harq processing procedure and some of the received data may include a HARQ retransmission. This item is determined at block 54. If it is a HARQ retransmission, the HARQ content previously stored for the first class is combined with the most recently received HARQ sub-packet. After the HARQ data for each stream is approximately combined as necessary, all frames are decoded at block 58 and all CRCs are checked at block 60. If all CRCs pass, all HARQ buffers are vacated at square 62 and the system continues to move to receive the next set of sub-packets at block 64. If some of the CRC checks fail, the system restores the original HARQ buffer contents to the previous state at block 66 and performs successive interference cancellation processing procedures for each stream as indicated by 5丨. Again, equalization is performed at block 68 to generate a set of soft symbols for the first stream, the HARQ buffers are suitably combined, the frame is decoded at 72, and the data is re-encoded and self-received at block 74. However, in the interference cancellation processing procedure, if the linear equalization decoder output passes the CRC check at block 86, but successively eliminates I09l26.doc 14 13/8660 two-scramble: the output of the device does not pass, then linear The equalized output is passed in === and is processed in the step-by-step process, and is the stream/"Q buffer piracy. This ensures that even if there is a mistake during the elimination of interference, the effectiveness of the blind defeat elimination program can never be reduced to - Under the pure linear balance system.

The other-modification of this idea is shown in the flow chart of Figure 6: the processing procedure: - similar to the case of the processing procedure, the case is: if the - 解码 解码 decoding read out through the CRC but eliminates the interference decoder output The output is not re-encoded and the subtraction decoder output is re-encoded and subtracted from the receive buffer at block 90. If there is no pass, the successive cancel interferer output is used at block 92. Step-by-step elimination The SNR improvement achieved by the interference cancellation technique can be used to increase production. Does not automatically increase with high data rates. High data transmission = can lead to more frequent errors and more Retransmission. Usually, the best yield is not derived from the highest data transmission rate or the lowest error rate, but a combination of the data transmission rate and the error rate that leads to short-term proper decoding. Figure 7 is based on production. A geometrical plot illustrating the expected benefits of an embodiment of the present invention. Geometry along the horizontal axis refers to #, and yield is indicated along the vertical axis. Geometry corresponds to background noise plus other base stations The power of the received power from the servo base station (10) is relatively high. The higher geometry indicates that the mobile station 102 is closer to the servo base station 1(). The simulation uses per-antenna rate control (pARC) and adaptive modulation. 2x2 MIM0 system code 109l26.doc 1378660 (AMC). The parameters used include a speed of 3 km per hour and an Ec/I〇r of -1 dB (the ratio of data power to total power in the servo base station is also assumed to be based on A complete estimate of the communication power from the base station before the base station, and assuming an ideal noise estimate. Surprisingly, as illustrated by the specific simulation, for blinded interference cancellation and semi-blind The simulated production results of interference cancellation are in fact indistinguishable from the complete elimination of interference based on coffee. And these results are achieved with relatively low complexity to eliminate interference. The simulation also indicates the elimination of interference and the production without comparison of interference elimination. Disable the much lower yield indication to eliminate interference. Simulate the knot or worse the result. In addition, the actual achievable result is better and so on. 、··········· Those who are familiar with the technology should understand that the process and any of the processes indicate that the second example uses a large number of different technical instructions, commands, information, and information to run through the above referenced data, voltage, current, electromagnetic waves, magnetic fields, and The wafer may be represented by an electrical combination. Μ or particles, a light field or a particle or any of the above-mentioned skilled artisans should be further developed. The examples described in conjunction with the description may be implemented as electronic hardware. , Modules, circuits, and calculation steps illustrate the hardware and software of the combination of the software and the combination of the two. For clear modules, circuits and steps usually: transmutability 'different illustrative components, blocks, functions Whether as hardware or soft: ': The machine has been described above. The design constraints on this system are: depending on the specific application and imposed on the component. The skilled person can implement the described functions in various ways for each particular application, but this implementation decision should not be interpreted as causing departure from the scope of the invention. ▲Different illustrative logic blocks, A, and private paths described in conjunction with the embodiments disclosed herein may be implemented or executed by: general purpose processors, digital processors (DSPs), special application integrated circuits ( ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of the above designed to perform the functions described herein. The general purpose processor may be a microprocessor, or the processor may be a processor, a control H, a microcontroller or a state machine. The processor can also be implemented as a combination of computing devices, such as a group of Dsp and a microprocessor.

The steps of the method or algorithm described in conjunction with one or more microprocessors in conjunction with a Dsp core, or any other such configuration Q, in conjunction with the embodiments disclosed herein, can be implemented in a hard The medium and the f are applied to a software module executed by the processor or implemented in a combination of the two. The software module can be retained in the ram memory, in the flash memory, in the ROM memory, in the EpR〇M memory, in the EEPR0M memory, in the scratchpad+, in the hard disk, in the removable disk. , in CD-ROM or in any other form of storage medium in the art. An exemplary storage medium is coupled to the processor such that the processor can read information from, and can write information to, the storage medium. Alternatively, the storage medium can be associated with the processor body. The processor and storage medium can be retained in an ASIC. This can be stuck in the -user terminal. Alternatively, the processor and the storage medium may be retained as discrete components in the user terminal. The previous description of the disclosed embodiments is provided to enable a person skilled in the art to make or use the invention in the form of I09126.doc 1378660. The various modifications of the embodiments are obvious to those skilled in the art, and the general principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but rather the broadest scope consistent with the principles disclosed herein. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an example of a system in which an embodiment of the present invention may be implemented;

2 is an example of a system for blinded sequential interference cancellation (SIC) illustrated in a system having an Nt transmit antenna and an Nr receive antenna; FIG. 3 is a diagram illustrating blinded interference cancellation in accordance with an embodiment of the present invention. FIG. 4 is a first example of a system for semi-blind sequential interference cancellation (SIC) illustrated in a system having a team transmission antenna and a team receiving antenna; FIG. 5 is a diagram illustrating a method in accordance with the present invention. A flowchart of a semi-blind interference cancellation technique of an embodiment;

BRIEF DESCRIPTION OF THE DRAWINGS Figure 7 is a flow chart illustrating a first interference technique in accordance with an embodiment of the present invention; and Figure 7 is a diagram illustrating a first embodiment of the present invention. Simulation of the benefits of the two-half blinded elimination embodiment [Major component notation] 12 Base station 14 Mobile station 22 Demodulator 24 Analog/digital converter (A/D) 109l26.doc 1378660 26 Sample buffer 28 Space-time Receiver/Equalizer 30 Decoding Circuit 34 HARQ Memory 3 8 Data Combiner/Decoder 42 Error Check Circuit 44 Signal Reconstruction Circuit 47 Multiplier 80 Termination State 100 Base Station 102 Mobile Station

109l26.doc -19-

Claims (1)

1378660 Patent Application No. 095106906, Chinese Patent Application Renewal (March 101) Ten 'Application Patent Range: -- I - A device for eliminating interference, including: 〇'year and now peach correction page 丨a receiver/equalizer having one signal input and N signal outputs, wherein each of the one of the signal outputs corresponds to one of the one received data streams; Detecting and decoding the one of the signal outputs from the receiver/equalizer to regenerate the decoders of the received data streams; and configured to decode the signal outputs by the decoder At least one decoding cancellation interference feedback loop generated by decoding the data stream 1 to the decoded data stream to successively cancel the interference generated in the one received data stream; wherein the decoder is configured to cancel the interference without the interference Detecting and decoding during the at least one decoding period of performing the signal output of all the receivers/equalizers decoded by the decoder by the feedback loop in the condition of successively canceling the interference, and storing The result of the decoding of the signals output; wherein the decoder is further configured to perform decoding of all of the receivers by the decoder in a successive interference cancellation condition that has been performed by the interference cancellation feedback loop/ The at least one decoding period of the equal signal outputs of the equalizer is detected and decoded, successively detected and decoded, and the result of the decoding of the data stream 1 to the data stream is stored; and wherein the interference is eliminated The feedback loop is further configured to pass the decoded results of the decoded outputs of the ones of the signals through the at least one error checking process and the data stream 1 to the data stream of the decoded 109126-1010328 .doc 1378660 -------- The stored results of the decodings selected for the N signal outputs are used to eliminate interference when the stored results are not passed through the at least one error checking process. μ 2. The apparatus of claim 1, wherein the interference cancellation feedback loop uses a weighted attenuation between ^ and ^ to reduce errors and delays from incorrectly decoded data streams. 3. The device of claim 1, wherein the device is configured to pass the at least one error checking process to the data stored in the decoded of the ν signals and the data flows to the data stream And the stored results of the decodings of the decoded data are not used by the at least one error checking processing program, and the stored results of the decodings output by the one of the signals are used for further data processing and abandonment of the data stream i to the data stream of the decoded results of the decodings. 4. A method of decoding mutually received data streams, the method comprising: performing linear equalization and decoding of the N received data streams without successively canceling interference by a cancellation interference feedback loop The N linearly equalized received data streams to generate N decoded linearly equalized received data streams; subsequently using the interference cancellation feedback loop to perform a successive cancellation of interference on the N received data streams to generate And sequentially canceling the received data stream of the interference, performing a sequential linear equalization on the N received data streams having successive interference cancellations, and sequentially decoding at least some of the N received data streams having successive interference cancellation, regardless of the successive Ground solution 109126-1010328.doc -2- 1378660 The following year $month corrects whether the page number has an error to generate a successively decoded received data stream; an error checking circuit is used to check the decoded and linear Equilibrium of the data stream and the subsequent errors in the received data stream of the solution; and the use of further information Processing the following data: the data of the decoded and linearly balanced received data streams when the decoded and linearly balanced received data streams pass through an error checking process, and The decoded and linearly balanced received data stream passes through the data of the successively decoded received data streams when an error check processing program fails. 5. The method of claim 4, wherein one or more of the one received data streams are comprised of a series of sub-packets combined in a hybrid automatic repeat request (HARQ) processing procedure. 6. A method of decoding N received data streams superimposed on each other, the method comprising: performing linear equalization of the N received data streams to generate N in a condition that has not been successively cancelled by an interference cancellation feedback loop And linearly equalizing the received data stream, decoding the N linearly equalized received data streams to generate N decoded received data streams, and storing the N decoded received data streams to generate N stored received data streams Streaming; subsequently using the interference cancellation feedback loop to perform a successive cancellation of interference on the N received data streams to generate N received data streams having successive cancellations, for the N received data having successive interference cancellations Performing a sequential linear equalization on the stream, and sequentially decoding at least some of the 109126-1010328.doc 1378660 N received data streams with successive interference cancellation, regardless of whether the decoding is sequential or not, to generate _ with successive interference cancellation The decoded data stream is decoded; a stored data of the N stored and received data streams is passed through an error check And the program and the associated data from the decoded received data streams having successively canceled interferences are not passed through an error checking process, and are selected for use in the N stored received data streams for use in canceling interference. Store data. 7. A communication system comprising: a transmitter comprising two or more antennas configured to transmit individual data streams; a receiver comprising two or more antennas configured Receiving the individual data streams; an equalizer comprising one of a weighting filter from one of the transmitters to the channel characteristic determination of the receiver, the equalizer being configured to use the individual data streams to generate Soft decision output data; a data combiner/decoder configured to combine the individual data streams with previously received unsuccessfully decoded data and to generate an individual stream of decoded hard decision output data; a loop configured to perform successive cancellation of interference on the input of the individual data streams to the equalizer; wherein the data combiner/decoder is further configured to detect and decode interference cancellation that is not eliminated by the successive The loop performs the successive elimination of the interference from all the individual data streams received from the equalizer, and the storage is not succeeded by the above-mentioned 109126-1010328.doc. Performing a first result of decoding the individual data streams that successively cancels interference; wherein the data combiner/decoder is further configured to condition the interference cancellation that has not been performed by the successively canceling the interference feedback loop as described above After decoding the individual data streams, detecting, decoding, and decoding all of the individual data streams received by the scaler in a condition that has been successively eliminated by the successive cancellation and feedback loops, and storing the decoded individual data streams The second result of the flow; and the second elimination interference feedback loop is further configured to pass at least the error check processing procedure and the first result of the memory is not passed through at least the error The inspection process selects the stored first result in addition to the interference. 4: 8, 9, 10, such as the system of the monthly claim 7, wherein the transmitter is configured to properly control the data transmission rate to reduce the loss of the data stream in the receiver due to the use of undecoded data streams. The spread of interference has spread. The system in which the transmitter is configured to properly control the transmission rate of the B material to reduce the first sub-package of one of the processing programs... The retransmission (4) request (HARQ) is the error rate in the spurious packet. A communication device comprising: two or two antennas for receiving individual data streams; generating a soft-decision output data for a surname_glycan stream to generate a soft decision-making component It uses these individual measures and resolves all of the components of the individual data streams, the means for decoding, including the means for combining the individual data streams with the previous 109126-1010328.d〇c τ, only bamboo' and Decoding the individual data streams to produce decoded hard decision output data; and means for performing successive interference cancellation, wherein in at least one of the following cases, the interference cancellation is successively applied to the output for generating soft decision output On the individual data streams of the component, the at least one condition is that the component for detecting and decoding produces a first = another stream of the decoded hard decision output data, which is from the wheel to the soft decision output. The data stream of the data and the means for performing the successive interference cancellation have not performed successive cancellation of the interference; the other stream; - the t is used to m decode all the components of the individual data streams - Configuring to store the decoded hard decision output data: wherein the means for extracting and decoding all of the individual data streams is configured to store a second individual of the decoded hard decision output data The stream is generated from the input stream to the data stream for the production decision-making output data piece by the successive cancellation of interference performed by the means for performing successive interference cancellation; and in the decoded hard decision output data And storing the first individual stream through an at least-error checking process and the stored second individual stream of the decoded hard (four) data fails to pass at least - error checking processing = sequence, for successively canceling the interference The means for canceling the selection of the stored first individual stream of decoded hard decision output data / U. The apparatus of claim 10, further comprising a second individual stream for attenuating the decoded hard decision output data to reduce Incorrectly decoded data 109126-l〇l〇328.doc 1378660 Flow generated error spread component 109126-1010328.doc