CN101783717B - Blind detection method and device for time division-synchronization code division multiple access (TD-SCDMA) voice signals - Google Patents
Blind detection method and device for time division-synchronization code division multiple access (TD-SCDMA) voice signals Download PDFInfo
- Publication number
- CN101783717B CN101783717B CN 201010115452 CN201010115452A CN101783717B CN 101783717 B CN101783717 B CN 101783717B CN 201010115452 CN201010115452 CN 201010115452 CN 201010115452 A CN201010115452 A CN 201010115452A CN 101783717 B CN101783717 B CN 101783717B
- Authority
- CN
- China
- Prior art keywords
- channel
- estimation
- code
- detection
- decoding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 claims abstract description 30
- 230000004044 response Effects 0.000 claims description 88
- 239000011159 matrix material Substances 0.000 claims description 30
- 238000012545 processing Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 13
- 238000000354 decomposition reaction Methods 0.000 claims description 8
- 230000007480 spreading Effects 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 4
- 108010003272 Hyaluronate lyase Proteins 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013468 resource allocation Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The invention relates to the technical field of communication and discloses blind detection method and device for time division-synchronization code division multiple access (TD-SCDMA) voice signals. The method comprises the steps of: continuously carrying out combined detection on all same code channels of all the same time slots of subframes received by an idle port by a physical layer; after the time of code channel detection reaches the length of an interleaved frame, carrying out combined decoding on data of the same time slots of a plurality of subframes of the code channels according to the result of the combined detection; and if the decoding is right, sending decoded data to a high-level layer to be processed. By using the invention, uplink and downlink voice services of the idle port can be received without obtaining uplink and downlink resource configuration information of a terminal.
Description
Technical Field
The invention relates to a communication technology, in particular to a blind detection method and a blind detection device for TD-SCDMA voice signals.
Background
In a TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system, a detection mechanism of an existing terminal for a signal is shown in fig. 1, and the main working process is as follows:
1. the high layer obtains resource configuration information and transmits the obtained resource configuration information to the physical layer, wherein the resource configuration information mainly comprises: subframe number, time slot number, scrambling code number, midamble sequence window number and code channel number;
2. after obtaining the resources configured for the terminal, the physical layer receives time slot data according to the subframe number and the time slot number; performing joint detection according to the midamble sequence window number and the code channel number allocated to the terminal to obtain demodulation data of the code channel corresponding to the terminal;
3. after detecting the data of one time slot, judging whether the length of an interleaving frame is reached, if so, jointly decoding the data of each time slot in the interleaving frame; otherwise, continuing to receive the data of the next configuration time slot;
4. the decoded data is sent to the high layer for processing.
When the above detection mechanism for signals is applied to an air interface to receive voice signals, the following problems may occur:
because the resource configuration information acquired by the high layer is acquired in the process of random access of the terminal, (1) if the channel condition is poor at this time, the resource configuration information of the terminal cannot be effectively acquired; (2) if the terminal is already communicating when the air interface signal receiving device is started, the random access process is missed at this time, and the resource configuration of the terminal cannot be obtained. If the resource allocation information of the terminal cannot be obtained, the voice signal cannot be received by using the existing mechanism.
Disclosure of Invention
The embodiment of the invention provides a blind detection method and a blind detection device for TD-SCDMA (time division-synchronization code division multiple Access) voice signals, which can realize the reception of uplink and downlink voice services of an air interface without acquiring uplink and downlink resource configuration information of a terminal.
Therefore, the embodiment of the invention provides the following technical scheme:
a blind detection method for TD-SCDMA voice signals comprises the following steps:
continuously carrying out joint detection on all the same code channels of all the same time slots of all the subframes received by an air interface;
after the time of the code channel detection reaches the length of an interleaving frame, carrying out joint decoding on data of the same time slot of a plurality of sub-frames of the code channel according to the result of joint detection;
and if the result of the joint decoding is correct, sending the decoded data to a high-level processor.
Preferably, the method further comprises:
acquiring a midamble sequence and a scrambling code of a cell through broadcast information;
the performing joint detection on all the same code channels of all the same time slots of each subframe received by the air interface includes:
performing channel estimation by the midamble sequence to obtain channel impulse response;
decomposing the channel impulse response into channel responses corresponding to each estimation window;
constructing a system matrix according to the channel responses of the nonzero estimation windows in the channel responses corresponding to the estimation windows and the scrambling codes;
and carrying out joint detection according to the system matrix.
Preferably, the method further comprises:
and performing noise reduction processing on the channel impulse response before decomposing the channel impulse response into the response of each estimation window.
Preferably, the constructing a system matrix according to the channel responses of the non-zero estimation windows in the channel responses corresponding to the estimation windows and the scrambling codes comprises:
calculating a combined channel response according to the channel responses of the non-zero estimation windows in the channel responses corresponding to the estimation windows to obtain:
where c represents a dot product of the spreading sequence and the scrambling code, and has a length Q of 16,hc represents the channel response corresponding to c, W is the length of the channel estimation window, where W is 16, b is the combined channel response, and the length is Q + W-1 is 31;
a system matrix is constructed from the combined channel responses b.
Preferably, the method further comprises:
if the result of the combined decoding is correct, recording an interleaving frame header;
and when the subsequent joint detection is carried out on the same code channel of the same time slot of each sub-frame received by the air interface, selecting a sub-frame group for joint detection according to the interlaced frame header.
A blind detection device for TD-SCDMA voice signals, comprising:
the detection unit is used for continuously carrying out joint detection on all the same code channels of all the same time slots of all the subframes received by the air interface;
a decoding unit, configured to perform joint decoding on data of the same time slot of multiple subframes of the code channel according to a joint detection result after the time for detecting the code channel reaches the length of an interleaved frame;
the judging unit is used for judging whether the result of the joint decoding is correct or not, if so, sending a notice to the sending unit, and if not, sending a notice to the detecting unit;
and the sending unit is used for sending the data decoded by the decoding unit to a high-level process after receiving the notice sent by the judging unit.
Preferably, the apparatus further comprises:
the acquiring unit is used for acquiring a midamble sequence and a scrambling code of a cell through the broadcast information;
the detection unit includes:
a channel estimation subunit, configured to perform channel estimation on the midamble sequence to obtain a channel impulse response;
a decomposition subunit, configured to decompose the channel impulse response into channel responses corresponding to the estimation windows;
a system matrix constructing subunit, configured to construct a system matrix according to the channel responses of the non-zero estimation windows in the channel responses corresponding to the estimation windows and the scrambling codes;
and the joint detection subunit is used for carrying out joint detection according to the system matrix.
Preferably, the detection unit further comprises:
and the de-noising processing subunit is respectively connected with the channel estimation subunit and the decomposition subunit, and is used for performing de-noising processing on the channel impulse response and outputting the de-noised channel impulse response to the decomposition subunit.
Preferably, the system matrix constructing subunit includes:
a combined channel response calculating subunit, configured to calculate a combined channel response according to the channel responses of the non-zero estimation windows in the channel responses corresponding to the estimation windows, so as to obtain:
where c represents a dot product of the spreading sequence and the scrambling code, and has a length Q of 16,hc represents the channel response corresponding to c, W is the length of the channel estimation window, where W is 16, b is the combined channel response, and the length is Q + W-1 is 31;
a constructing subunit for constructing a system matrix from the combined channel responses b.
Preferably, the apparatus further comprises:
a frame header recording unit, configured to record an interleaving frame header after the judgment unit judges that the decoding result is correct;
the detection unit is further configured to select a subframe group for joint detection according to the interlaced frame header when performing joint detection on the same code channel of the same time slot of each subframe received by the air interface in the subsequent process.
In the method and the device for blind detection of TD-SCDMA voice signals provided in the embodiments of the present invention, the physical layer continuously performs joint detection on all the same code channels of all the same time slots of each subframe received by the air interface; after the time of the code channel detection reaches the length of an interleaving frame, carrying out joint decoding on data of the same time slot of a plurality of sub-frames of the code channel according to the result of joint detection; and if the decoding is correct, sending the decoded data to a higher layer for processing. Therefore, the receiving of the uplink and downlink voice services of the air interface can be realized without acquiring the uplink and downlink resource configuration information of the terminal.
Drawings
FIG. 1 is a diagram illustrating a mechanism for detecting a signal by a terminal in a TD-SCDMA system in the prior art;
FIG. 2 is a schematic diagram of a frame structure of a TD-SCDMA system;
FIG. 3 is a flowchart of a blind detection method for TD-SCDMA voice signals according to the present invention;
FIG. 4 is a diagram illustrating a joint decoding structure according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating a method for blind detection of TD-SCDMA voice signals according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a blind detection apparatus for TD-SCDMA voice signals according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a specific implementation of the blind detection apparatus for TD-SCDMA voice signals according to the embodiment of the present invention.
Detailed Description
In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.
Fig. 2 is a schematic diagram of a frame structure of the TD-SCDMA system.
The frame length of a TD-SCDMA is 10ms, and the TD-SCDMA is divided into two sub-frames with the same structure. Each subframe is divided into 7 regular slots and 3 special slots of length 0.675 ms. Wherein, the regular time slot includes: 1 downlink broadcast slot (TS 0) and 6 data slots (TS 1, TS2, …, TS 6). The 3 special time slots are respectively: DwPTS (downlink pilot time slot), GP (guard time slot), and UpPTS (uplink pilot time slot). The time length of the broadcast time slot and the data time slot is 675us, the length of the DwPTS and the length of the GP are 75us, and the length of the UpPTS is 125 us. As shown in fig. 2, one normal slot includes 2 data segments, one midamble sequence, and one guard interval (GP).
In TD-SCDMA, the length of an interleaved frame of a voice service is 20ms, which includes 4 subframes, and the service mapping of the voice service is based on the interleaved frame as a unit, i.e., once every 20 ms. The frame head of the interweaving frame is the 1 st sub frame in the 4 sub frames of the voice service, so the voice service can be searched and detected through the frame head of the interweaving frame. The TD-SCDMA spreading code is OVSF (orthogonal variable spreading factor) code, and the spreading factor is performed at a lower level by 16 and at an upper level by 8 (one spreading factor is 8 corresponding to a pair of virtual code channels). The channel resources to be configured for one path of voice are: one subframe is configured with one time slot, one time slot is configured with a pair of code channels, and one path of voice configuration is basically the same code channel under the same time slot of the continuous subframes. The number of code channels collocated with one interleaving frame length of voice service is 2 × 4-8. In order to correctly detect a certain path of voice service, the resource configuration to be acquired includes a scrambling code number, a midamble sequence number, a code channel number, and a midamble sequence window number corresponding to the code channel.
These information may be obtained via resource configuration information for a particular terminal. However, under the requirement of some special applications, it is necessary to obtain uplink and downlink voice signals of an air interface through other devices.
Since the midamble sequence and scrambling code of a cell can be acquired by despreading, both information can be considered to be known. The precondition of the joint detection needs to obtain the corresponding relationship between the window number and the code channel number of the midamble sequence, and the allocation mode of the midamble sequence in the current network is basically the default mode (in the default mode, the code channel number determines the window number), which can be considered as the known corresponding relationship. Although the corresponding relation between a certain terminal and the code channel number is not determined, all the code channel data of all the service time slots of all the subframes can be demodulated according to the voice service, and then decoded according to the voice service mode. Therefore, as long as the current air interface has voice service, the voice service can be searched by the global searching method and correctly received, and the purpose of air interface receiving is achieved.
Therefore, the blind detection method for TD-SCDMA voice signals in the embodiment of the present invention is based on the above principle, where a physical layer continuously performs joint detection on the same code channel of the same time slot of each subframe received by an air interface, and after the time for detecting the code channel reaches the length of an interleaved frame, jointly decodes data of the same time slot of multiple subframes of the code channel according to the joint detection result, and if the decoding is correct, sends the decoded data to a high layer for processing, thereby implementing reception of TD-SCDMA voice signals.
As shown in fig. 3, it is a flowchart of a blind detection method of TD-SCDMA voice signals according to the embodiment of the present invention, including the following steps:
Assuming that the code channel numbers used by all terminals are unknown, the received sequence can be expressed as:
e=Ad+n
wherein e, d, n respectively represent a receiving sequence, a transmitting sequence, and a noise sequence. Matrix a, referred to as the system transmission matrix, is formed by combining the channel responses. The flow of the joint detection algorithm is as follows:
(1) raw channel estimation
Channel impulse response obtained by channel estimation through midamble sequenceh n =[h n 0，h n 1，…，h n P-1]TWhere P ═ 128 denotes the length of the midamble sequence, and T in the upper right hand corner of the middle bracket denotes the transpose operation on the matrix.
(2) Noise reduction processing
Is provided with
Calculating a noise reduction threshold for the denoised channel impulse response
Wherein,
is the threshold of the signal-to-noise ratio,
is the recursive average noise power given by the measurement module, and the noise reduction processing algorithm is as follows:
(3) window response acquisition
Estimating the channel after noise reduction processing according to the estimation window distribution information
Decomposing the responses into the responses of the estimation windows to obtain the channel responses corresponding to the channel estimation windowsh t 。
Wherein, KmAnd W represents the number and length of windows, respectively, and K is typically taken as the defaultm＝8，W=16。
(4) Constructing a system matrix
Will be provided withh t All non-zero window channel responses are retained, and K is obtained to be more than or equal to KmA channel impulse response of a window. Specifically, may be in accordance with kmCirculate from small to largeThe operation is as follows:
if it is
Thenk=k+1,km=km+1；
If it isThen k ism=km+1。
And calculating the response of the combined channel according to the corresponding relation between the window and the code channel to obtain:
where c denotes a dot product of the spreading sequence and the scrambling code, and has a length Q + 16, b is a combined channel response, and has a length Q + W-1= 31. The corresponding relation between the window and the code channel can adopt a default value in the existing protocol.
The system matrix a is then constructed by b according to existing methods.
(5) The algorithm of joint detection can be expressed as
Wherein,AHdenotes the transpose conjugate operation of the a matrix, and I denotes the identity matrix.
It should be noted that the step (2) is an optional step.
The joint decoding is composed of N speech decoding modules, the number of N depending on the processing power of the system. Each speech decoding module consists of 8 parts: cyclic redundancy check, channel decoding, 1 st time of deinterleaving, rate de-matching, service de-multiplexing, 2 nd time of deinterleaving, subframe decomposition and physical channel demapping.
The structure block diagram of the joint decoding is shown in FIG. 2, in which d(n)And b(n)Respectively representing the data after the 4 subframes joint detection and the data after the decoding processing of the nth pair of code channels.
And (3) processing the decoded data by a layer 2 and a layer 3, and performing service restoration to obtain an actual voice signal.
In the embodiment of the invention, all non-zero window channel responses are reserved in the joint detection, the activation detection is not required to be carried out according to the traditional method, and the protection of the channel impulse response of a low-power window can be achieved; the decoder comprises a plurality of voice decoding modules, can decode demodulated data of a plurality of pairs of code channels in parallel, and can ensure that voice signals can be received at an air interface to the maximum extent by a detection and decoding scheme.
The present invention will be described in further detail with reference to a specific example.
It is assumed that the length of the interleaving frame of the voice service is 4 sub-frames, and the number of code channels configured for each voice time slot is 2.
As shown in fig. 5, a specific implementation flow of the blind detection method for TD-SCDMA voice signals in the embodiment of the present invention includes the following steps:
step 501, receiving data of a current time slot of a current subframe.
Step 502, performing joint detection on the data of the time slot.
Assume that the current subframe number is n, the current time slot is TS4, and the received code channel number is 0, 1. The physical layer first performs joint detection on the data of TS4 for subframe n.
Step 503, for each pair of code channels, judging whether the detected time reaches the length of the interleaved frame; if so, go to step 504; otherwise, the procedure returns to step 501.
That is, the physical layer needs to continuously receive TS4 data of subframes n +1, n +2, and n +3 for joint detection, so as to obtain demodulated data of code channels 0 and 1 in TS4 of (n, n +1, n +2, n + 3) total 4 frames.
Step 504, jointly decoding the obtained data of the same time slot of a plurality of continuous sub-frames of each pair of code channels.
As described above, demodulated data of code channels 0, 1 in TS4 of 4 frames (n, n +1, n +2, n + 3) are obtained after the joint detection, and then the data are subjected to the joint decoding.
And 505, performing CRC on the decoded data, and judging whether the CRC is correct. If so, go to step 506; otherwise, the procedure returns to step 501.
Step 506, the decoded data is sent to a high-level process.
Step 507, acquiring an interleaving frame header. Then, the process returns to step 503.
If the CRC check is correct, it indicates that there is a path of voice on the code track 0, 1, at this time, an interleaving frame header can be obtained, and the interleaving frame header is recorded, so that the subframe groups (n +4, n +5, n +6, n + 7), (n +8, n +9, n +10, n + 11) … can be detected and decoded respectively according to the interleaving frame header; otherwise, the data of the sub-frames n +4, n +5, … need to be detected continuously, and the demodulated data of (n +1, n +2, n +3, n + 4), (n +2, n +3, n +4, n + 5), … TS4 track 0, 1 are jointly decoded until the interleaving frame header is found.
The blind detection method of TD-SCDMA voice signals of the embodiment of the invention judges whether voice service exists by continuously detecting and decoding the same code channel of the same time slot of the continuous subframes, thus receiving the voice signals of an air interface without acquiring the resource configuration information of a terminal. Furthermore, the CRC check result is used for searching the interleaving frame head, and after the interleaving frame head is found, the interleaving frame head is used as a reference point for decoding, so that the decoding process is simplified.
Those skilled in the art will appreciate that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a computer-readable storage medium, and the program may be configured to: ROM/RAM, magnetic disk, optical disk, etc.
Correspondingly, an embodiment of the present invention further provides a blind detection apparatus for TD-SCDMA voice signals, as shown in fig. 6, which is a schematic structural diagram of the apparatus.
In this embodiment, the apparatus comprises: detection section 601, decoding section 602, determination section 603, and transmission section 604. Wherein:
a detecting unit 601, configured to perform joint detection on all the same code channels of all the same time slots of each subframe received by the air interface continuously;
a decoding unit 602, configured to perform joint decoding on data in the same time slot of multiple subframes of the code channel according to a joint detection result after the time for detecting the code channel reaches the length of an interleaved frame;
a judging unit 603, configured to judge whether a result of the joint decoding is correct, if yes, send a notification to a sending unit 604, and if no, send a notification to the detecting unit 601;
a sending unit 604, configured to send the data decoded by the decoding unit 602 to a higher layer for processing after receiving the notification sent by the determining unit.
In the embodiment of the present invention, the apparatus may further include:
an obtaining unit 605, configured to obtain a midamble sequence and a scrambling code of a cell through broadcast information;
accordingly, a preferred structure of the detecting unit 601 includes:
a channel estimation subunit 611, configured to perform channel estimation on the midamble sequence to obtain a channel impulse response;
a decomposition subunit 613, configured to decompose the channel impulse response into channel responses corresponding to estimation windows;
a system matrix constructing subunit 614, configured to construct a system matrix according to the channel responses of the non-zero estimation windows in the channel responses corresponding to the estimation windows and the scrambling codes;
and a joint detection subunit 615, configured to perform joint detection according to the system matrix.
In order to further optimize the channel estimation result, as shown in fig. 6, the detecting unit 601 may further include:
and a denoising subunit 612, configured to perform denoising processing on the channel impulse response to obtain a channel estimation result.
One preferred configuration of the system matrix construction subunit 614 includes: a combined channel response calculation subunit and a construction subunit (not shown). Wherein, the combined channel response calculating subunit is configured to calculate a combined channel response according to the channel response of the non-zero estimation window in the channel responses of the corresponding estimation windows to obtain:
wherein c represents a dot product of the spreading sequence and the scrambling code, the length is Q & lt16 & gt, b is a combined channel response, and the length is Q + W-1 & lt31 & gt; the constructing subunit is configured to construct a system matrix from the combined channel response b.
The blind detection device of the TD-SCDMA voice signal of the embodiment of the invention judges whether the voice service exists by continuously detecting and decoding the same code channel of the same time slot of the continuous sub-frames, so that the voice signal of an air interface can be received without acquiring the resource configuration information of a terminal.
Fig. 7 is a schematic structural diagram of a specific implementation of the blind detection apparatus for TD-SCDMA voice signals according to the embodiment of the present invention.
Unlike the embodiment shown in fig. 6, in this embodiment, the apparatus further includes:
a frame header recording unit 606, configured to record the interleaving frame header after the determining unit 603 determines that the decoding result is correct.
Correspondingly, the detecting unit 601 is further configured to select a subframe group for joint detection according to the interleaving frame header when performing joint detection on the same code channel of the same time slot of each subframe received by the air interface in the subsequent process.
The blind detection device of the TD-SCDMA voice signal of the embodiment of the invention judges whether the voice service exists by continuously detecting and decoding the same code channel of the same time slot of the continuous sub-frames, so that the voice signal of an air interface can be received without acquiring the resource configuration information of a terminal. Furthermore, the CRC check result is used for searching the interleaving frame head, and after the interleaving frame head is found, the interleaving frame head is used as a reference point for decoding, so that the decoding process is simplified.
It should be noted that, the blind detection method and apparatus for TD-SCDMA voice signals in the embodiments of the present invention are applied in an environment that needs to satisfy the following preconditions:
1. the voice service channel resource allocation satisfies that the same code channel of the same time slot of the continuous sub-frame can be allocated to the same terminal;
the Midamble allocation mode is the default mode.
In addition, the foregoing embodiments are described by taking a single cell as an example, and the blind detection method and apparatus for TD-SCDMA voice signals according to the embodiments of the present invention can be applied not only to the case of a single cell, but also to the case of multiple cells through simple extension.
The above detailed description of the embodiments of the present invention, and the detailed description of the embodiments of the present invention used herein, is merely intended to facilitate the understanding of the methods and apparatuses of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A blind detection method for TD-SCDMA voice signals is characterized in that the method comprises the following steps:
acquiring a midamble sequence and a scrambling code of a cell through broadcast information;
continuously carrying out joint detection on all the same code channels of all the same time slots of all the subframes received by an air interface;
after the time of the code channel detection reaches the length of an interleaving frame, carrying out joint decoding on data of the same time slot of a plurality of sub-frames of the code channel according to the result of joint detection;
if the result of the joint decoding is correct, the decoded data is sent to a high-level process;
the performing joint detection on all the same code channels of all the same time slots of each subframe received by the air interface includes:
performing channel estimation by the midamble sequence to obtain channel impulse response;
decomposing the channel impulse response into channel responses corresponding to each estimation window;
constructing a system matrix according to the channel responses of the nonzero estimation windows in the channel responses corresponding to the estimation windows and the scrambling codes;
and carrying out joint detection according to the system matrix.
2. The method of claim 1, further comprising:
and before decomposing the channel impulse response into the channel responses corresponding to the estimation windows, performing noise reduction processing on the channel impulse response.
3. The method of claim 1, wherein constructing a system matrix according to the channel responses of the non-zero estimation windows of the channel responses corresponding to the estimation windows and the scrambling code comprises:
calculating a combined channel response according to the channel responses of the non-zero estimation windows in the channel responses corresponding to the estimation windows to obtain:
where c represents a dot product of the spreading sequence and the scrambling code, and has a length Q of 16,hrepresenting the channel response of a non-zero estimation window in the channel responses corresponding to the estimation windows, wherein W is the length of the channel estimation window, wherein W is 16, b is the combined channel response, and the length is Q + W-1 is 31;
a system matrix is constructed from the combined channel responses b.
4. The method according to any one of claims 1 to 3, further comprising:
if the result of the combined decoding is correct, recording an interleaving frame header;
and when the subsequent joint detection is carried out on the same code channel of the same time slot of each sub-frame received by the air interface, selecting a sub-frame group for joint detection according to the interlaced frame header.
5. A blind detection device for TD-SCDMA voice signals, comprising:
the acquiring unit is used for acquiring a midamble sequence and a scrambling code of a cell through the broadcast information;
the detection unit is used for continuously carrying out joint detection on all the same code channels of all the same time slots of all the subframes received by the air interface;
a decoding unit, configured to perform joint decoding on data of the same time slot of multiple subframes of the code channel according to a joint detection result after the time for detecting the code channel reaches the length of an interleaved frame;
the judging unit is used for judging whether the result of the joint decoding is correct or not, if so, sending a notice to the sending unit, and if not, sending a notice to the detecting unit;
a sending unit, configured to send the data decoded by the decoding unit to a higher layer for processing after receiving the notification sent by the determining unit;
the detection unit includes:
a channel estimation subunit, configured to perform channel estimation on the midamble sequence to obtain a channel impulse response;
a decomposition subunit, configured to decompose the channel impulse response into channel responses corresponding to the estimation windows;
a system matrix constructing subunit, configured to construct a system matrix according to the channel responses of the non-zero estimation windows in the channel responses corresponding to the estimation windows and the scrambling codes;
and the joint detection subunit is used for carrying out joint detection according to the system matrix.
6. The apparatus of claim 5, wherein the detection unit further comprises:
and the de-noising processing subunit is respectively connected with the channel estimation subunit and the decomposition subunit, and is used for performing de-noising processing on the channel impulse response and outputting the de-noised channel impulse response to the decomposition subunit.
7. The apparatus of claim 5, wherein the system matrix construction subunit comprises:
a combined channel response calculating subunit, configured to calculate a combined channel response according to the channel responses of the non-zero estimation windows in the channel responses corresponding to the estimation windows, so as to obtain:
where c represents a dot product of the spreading sequence and the scrambling code, and has a length Q of 16,hrepresenting the channel response of a non-zero estimation window in the channel responses corresponding to the estimation windows, wherein W is the length of the channel estimation window, wherein W is 16, b is the combined channel response, and the length is Q + W-1 is 31;
a constructing subunit for constructing a system matrix from the combined channel responses b.
8. The apparatus of any one of claims 5 to 7, further comprising:
a frame header recording unit, configured to record an interleaving frame header after the judgment unit judges that the decoding result is correct;
the detection unit is further configured to select a subframe group for joint detection according to the interlaced frame header when performing joint detection on the same code channel of the same time slot of each subframe received by the air interface in the subsequent process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010115452 CN101783717B (en) | 2010-02-26 | 2010-02-26 | Blind detection method and device for time division-synchronization code division multiple access (TD-SCDMA) voice signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010115452 CN101783717B (en) | 2010-02-26 | 2010-02-26 | Blind detection method and device for time division-synchronization code division multiple access (TD-SCDMA) voice signals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101783717A CN101783717A (en) | 2010-07-21 |
| CN101783717B true CN101783717B (en) | 2013-01-02 |
Family
ID=42523544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010115452 Active CN101783717B (en) | 2010-02-26 | 2010-02-26 | Blind detection method and device for time division-synchronization code division multiple access (TD-SCDMA) voice signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101783717B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109219052B (en) | 2017-06-30 | 2021-01-08 | 维沃移动通信有限公司 | Resource information transmission method, related equipment and system |
| CN109219113B (en) | 2017-07-05 | 2020-07-17 | 维沃移动通信有限公司 | Blind detection method, signal sending method, related equipment and system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE521246C2 (en) * | 2001-06-12 | 2003-10-14 | Ericsson Telefon Ab L M | blind Detection |
| KR100611507B1 (en) * | 2005-02-07 | 2006-08-11 | 삼성전자주식회사 | Blind detection method and apparatus, and mobile communication receiver having the same |
| CN100389551C (en) * | 2006-03-16 | 2008-05-21 | 华为技术有限公司 | Channel blind detecting method |
-
2010
- 2010-02-26 CN CN 201010115452 patent/CN101783717B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101783717A (en) | 2010-07-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1442360B1 (en) | Burst detector | |
| TWI467955B (en) | Methods for detection of failure and recovery in a radio link | |
| CN103533631B (en) | Radio link synchronization method and device in wireless communication terminal | |
| JP5094967B2 (en) | Method, facility and system for detecting a pilot sequence signal | |
| EP1895680A2 (en) | Apparatus and method for transmitting/receiving data in a multi-antenna system, and system using the same | |
| EP2262149B1 (en) | Data detection and demodulation for wireless communication systems | |
| CN107071903A (en) | The transmission method and device of a kind of beep-page message | |
| US20080273511A1 (en) | Multi-Cell Joint-Detection Method in Time-Slotted CDMA System | |
| KR100749432B1 (en) | A method and apparatus for, multi-user code channel activation detection in wireless communication system | |
| US20030223398A1 (en) | Method and apparatus for blind code detection | |
| US20120057488A1 (en) | Method and Device for Detecting of Transmitting Antenna Configuration in Long Term Evolution System | |
| JPH0884091A (en) | Information transmitting system,transmitting and receiving equipment based on time-varying transmission channel | |
| CN101801014A (en) | Method and device for detecting physical broadcast channel | |
| CN101335540B (en) | Physical code channel activating detection method and apparatus based on channel estimating postprocessing | |
| US20140029649A1 (en) | Advanced Multi-User Detector | |
| CN101783717B (en) | Blind detection method and device for time division-synchronization code division multiple access (TD-SCDMA) voice signals | |
| JP2006512840A (en) | Downlink training sequence detection method and apparatus in TDD / CDMA system | |
| CN107888260A (en) | A kind of beam selection method and relevant device | |
| EP2099185A2 (en) | Channel estimation in a terminal of an OFDM-based, cellular telecommunications system | |
| WO2005125068A2 (en) | Method and apparatus for reducing multi-user processing in wireless communication systems | |
| EP1881630A1 (en) | A code channel allocating and mutli-user detecting method in wireless communication system | |
| CN1787393B (en) | Method for detecting shifting sequence in Time division duplex system | |
| CN1822527B (en) | Method for detecting effectiveness of estimating window | |
| WO2012146140A1 (en) | Code channel activation method and device, computer program and storage medium | |
| CN101651926B (en) | Activation window detection method and device in a communicating system descending link receiver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |