RU2429573C1 - Rake receiver and method of receiving with rake receiver mixed services based on code division multiple access broadband system - Google Patents

Abstract

FIELD: information technology.

SUBSTANCE: RAKE receiver for mixed services based on code division multiple access broadband system includes a module (2) for high-speed reading/repeating antenna data, which transmits the control signal to a module (4) for controlling reading-recording antenna data twice within frame time; a module for controlling reading-recording antenna data, which speeds up frame transmission of delayed antenna data to a buffer module (6) for antenna data upon reception of the control signal; a module (5) for controlling multi-beam parameters, which transmits multi-beam parameters to the module (8) for multi-beam demodulation for controlling reading of antenna data in accordance with various types of services and controls a module (9) for generating scrambling and channel-forming codes jointly with a module (11) for controlling user parameters for generating corresponding scrambling and channel-forming codes needed for the multi-beam demodulation module (8); as well as a module (6) for buffering antenna data, which buffers delayed antenna data and accelerated antenna data are output after delay.

EFFECT: reducing use of resources.

10 cl, 8 dwg

Description

Technical field

The present invention relates to a baseband signal processing technology at a base station in a wideband code division multiple access (WCDMA) system, and in particular, to a RAKE receiver and a method for receiving mixed services based on a WCDMA system.

BACKGROUND OF THE INVENTION

In a WCDMA wireless communication system, due to a complex and error-prone wireless transmission medium, the RAKE receiver is typically used to demodulate multipath signals and perform the Maximum Ratio Combining to recover the signal.

In a conventional baseband signal processor at a base station in a WCDMA system, there are two demodulation modes for the RAKE receiver:

(1) A mode in which the demodulation of the DPCCH (Dedicated Physical Control Channel) and the demodulation of the DPDCH (Dedicated Physical Data Channel) are performed simultaneously.

When this mode is applied, the demodulation should be performed in accordance with the minimum SF coefficient, since the SF (Spreading Factor) coefficient of the DPDCH of the current frame is unknown, and after the DPCCH and DPDCH of the whole frame are demodulated, all received TFCI symbol data (Transport Format Combination Indicator) is decoded to obtain the actual SF, and as a result, re-integration of the demodulated DPDCH of this frame is performed .

(2) A delayed mode in which the DPDCH is demodulated one frame later than the DPCCH.

When this mode is applied, the DPCCH is demodulated as usual, and after the whole frame is demodulated, all received TFCI symbol data is decoded to obtain the actual SF coefficient, and then the DPDCH is demodulated, and the DPDCH is demodulated in accordance with the actual coefficient SF.

There is no strict requirement on the processing time of the dedicated physical channel (DPCH) in the R99 protocol; moreover, the system has limit values for the minimum SF coefficient corresponding to the requirements of various services, for example, the minimum SF for data transmission is 4, and the range of values corresponding to the actual SF is 4, 8, and 16. Therefore, a RAKE receiver using a delayed demodulation mode requires less hardware resources than a RAKE receiver using a simultaneous demodulation mode because demodulation and data storage nyayutsya using the actual SF, and the procedure repeated integration skipped. For this reason, most communication systems use a delayed demodulation mode.

However, in the minutes of R6 and subsequent 3GPP protocols (3 ^rd Generation Partnership Project - a project partnership 3rd generation) added to high-speed service uplink and procedures for receiving such high-speed uplink services in these protocols are defined relative to strictly, and the processing of the total delay in the system base station is greatly reduced. For example, the R6 protocol adds an upstream enhanced dedicated physical channel (E-DPCH), for the processing of which there is a strict time limit. In accordance with the 3GPP specification for the TTI (Transmission Time Interval) interval of 2 ms, the total processing delay in the base station system should not exceed 8.3 ms; and for a 10 ms TTI, the total processing delay in the base station system should not exceed 24.3 ms. In accordance with this limitation, the processing of the E-DPCH in a RAKE receiver employing a delay demodulation mode does not satisfy the system processing time requirement. The RAKE receiver, which uses the delay demodulation mode, does not satisfy the system processing time requirement for newly added channels in the protocols following R6.

In addition, the SF coefficient of the high speed uplink service changes very quickly, and this change is dynamic in real time. For example, in the 3GPP R6 protocol, it is determined that the actual SF of the E-DPDCH can be randomly changed in the range of 2 ~ 256, and there is no need to re-establish the wireless channel. In other words, the minimum SF for all users is 2, but the actual SF can be 2, 4, 8, 16, 32, 64, 128, and 256. Accordingly, when using the simultaneous demodulation mode, all users must demodulate channel E -DPDCH based on SF = 2 until the demodulation of the E-DPCCH channel in one TTI interval is complete, all ETFCI indicators (Enhanced Transport Format Combination Indicator) are collected and the actual SF coefficient is not determined pic COROLLARY decoding and then re-integration is executed. If SF = 2, the TTI interval of 10 ms has 19,200 data elements, and if the number of users reaches 128, then a large amount of data must be stored; Moreover, for processing a large amount of data in one TT1 interval, an operating frequency of the order of 250 MHz is required. Therefore, when there is a large number of users, to satisfy this requirement requires a large amount of memory resources and a very high frequency of data processing, which increases the complexity and cost of implementing the system.

Two of the currently available RAKE receiver modes are considered in detail, assuming that the correlation length in the multipath demodulation module is m chips.

Figure 1 shows a block diagram of a RAKE receiver using the simultaneous demodulation mode in a standard WCDMA system; this receiver satisfies the processing time requirement of the upstream data channels of the high-speed service using the R6 protocol and subsequent 3GPP protocols, but it requires a large amount of resources for data storage.

Figure 1 shows that in a standard RAKE receiver using the simultaneous demodulation mode, the data from the antenna goes directly to the antenna data buffering module for buffering, then m antenna data chips are transmitted to the multipath demodulation module in each synchronization cycle; at the same time, under the control of the user parameter control module, the corresponding scrambling and channelization codes generated by the scrambling and channelization codes generation module also enter the multipath demodulation module. In the multipath demodulation module, the operation of accumulating the correlation of the input antenna data and the scrambling and channel-forming codes is performed. In this case, the operation of accumulating the correlation of the data channel is carried out in accordance with the minimum coefficient SF. Control channel symbol data (DPCCH) and data channel symbol data (DPDCH), respectively, are also extracted. The control channel symbol data is transmitted to the control channel symbol processing module to estimate the channel, add the maximum signal to noise ratio and extract TFCI symbols, and as a result, all TFCI symbol data of one frame is obtained. All TFCI symbol data of one frame is transmitted to the TFCI decoding module for decoding, and after decoding is completed, the actual SF coefficient of the corresponding data channel is determined, and then the actual SF coefficient is transmitted to the data channel re-integration module. Since the data channel re-integration module stores all data of the data channel symbols until the actual SF coefficient is obtained, it reads this data to re-accumulate the symbols in accordance with the actual SF coefficient to obtain the final data channel symbols.

Figure 2 shows a diagram of a device of a standard RAKE receiver using a delay demodulation mode in a WCDMA system; where the receiver stores the antenna data for one frame in order to demodulate it after the corresponding DPDCH receives the actual SF, and the input data directly from the antenna (also called non-delayed antenna data) are used to demodulate the control channel, and the stored antenna data (called delayed antenna data) are used to demodulate the data channel. For this reason, two frames are required to demodulate the control channel and the data channel of one frame, and for the high-speed uplink data service, too much time is spent on demodulation, and therefore the total system processing time does not satisfy the 3GPP protocol requirements.

Figure 2 shows that in a standard RAKE receiver using the delay demodulation mode, under the control of the read-write antenna data control module, the input antenna data is stored in the antenna data memory, while the undelayed antenna data and the stored delayed antenna data are transmitted to the buffering module antenna data for subsequent multipath demodulation. The antenna data buffering module buffers the delayed antenna data and the unavailable antenna data and sends m antenna data chips to the multipath demodulation module in each synchronization cycle; at the same time, under the control of the user parameter control module, the corresponding scrambling and channelization codes generated by the scrambling and channelization codes generation module are also transmitted to the multipath demodulation module. The multipath parameter control module also sends the multipath parameters to the multipath demodulation module. The multipath demodulation module controls the operation of accumulating the correlation of the input antenna data and the scrambling and channelization codes in accordance with the multipath parameters provided by the multipath parameters control module, and as a result, control channel symbol data (DPCCH) and data channel symbol data (DPDCH) are determined. The symbols of the control channel are transmitted to the symbol processing module of the control channel to estimate the channel, add the maximum signal-to-noise ratio and obtain TFCI symbols, and as a result, all TFCI symbol data of one frame is determined. All TFCI symbol data of one frame is transmitted to the TFCI decoding module for decoding, and after decoding is completed, the actual SF of the corresponding data channel is determined, then the actual SF of this data channel is transmitted to the user parameter control module to control the formation of scrambling and channelization codes.

As a result, neither of the two standard types of RAKE receivers is capable of meeting the requirements of the R6 protocol and subsequent WCDMA protocols and, therefore, it is necessary to develop a new RAKE receiver and an appropriate reception method that will not only satisfy the time limit requirement, but also will not require a large amount of memory resources.

SUMMARY OF THE INVENTION

The technical problem that needs to be solved by means of the present invention is to overcome the disadvantages of the prior art and to create a RAKE receiver and an appropriate reception method that not only satisfies the time limit requirement of the R6 protocol and subsequent WCDMA protocols, but also does not require a large amount of memory resources.

To solve this technical problem, the present invention provides a RAKE receiver for mixed services based on a code division multiplex access system including an antenna read / write control module, antenna data memory, antenna data buffering module, multipath demodulation module, scrambling and channel-forming codes, a user parameter management module, a control channel symbol processing module and a TFCI decoding module, and also comprising a module for accelerated reading / repeating of antenna data associated with a module for reading and writing antenna data, and a multipath parameter control module, respectively, associated with a module for buffering antenna data, a multipath demodulation module, and a module for generating scrambling and channelization codes, wherein:

the module for accelerated reading / repeating of antenna data is configured to transmit a control signal to the module for reading and writing antenna data twice during one frame; and each time when the antenna data read-write control module receives this control signal, one frame of the delayed antenna data stored in the antenna data memory is rapidly output to the antenna data buffering module;

the multipath parameter control module is configured to store multipath parameters for various types of services, for transmitting multipath parameters to the antenna data buffering module in order to control the reading of antenna data in accordance with different types of services, for transmitting multipath parameters to the multipath demodulation module and for controlling, together with a module for managing user parameters, generating in the module for generating scrambling and channel-forming codes corresponding scrams blinking and channel-forming codes, which are required by the multipath demodulation module;

the antenna data buffering module is configured to temporarily store undelayed antenna data and antenna data, which are rapidly inserted after the delay memory; moreover, for the antenna data of the control channel, each multipath component is assigned one memory block, and each memory block stores m data chips; for antenna data, which is accelerated after the delay memory, each multipath component is assigned one memory block and each memory block stores 2m data chips; Where

m is the number of chips in the correlator of the multipath demodulation module.

The module for accelerated reading / repeating of antenna data sends a control signal at each half-frame time interval, respectively, to allow the module for reading and writing antenna data to accelerate the output of delayed antenna data stored in the antenna data memory to demodulate the uplink data channel of the high-speed service, and also speed up the output of delayed antenna data stored in the antenna data memory to demodulate the uplink service data channel using the R99 protocol.

In accordance with the multipath parameters provided by the multipath parameters control module and the corresponding scrambling and channelization codes generated by the scrambling and channelization codes generating module, the multipath demodulation module performs correlation demodulation of the unavailable antenna data and the accelerated input delayed antenna data and accordingly outputs the channel data data channel; at the same time, for the delayed antenna data in each synchronization cycle, the correlation demodulation of 2m antenna data chips is calculated on the basis of 2m scrambling and channelization code chips; and for non-delayed antenna data in each synchronization cycle, the correlation demodulation of m antenna data chips is calculated based on m chips of scrambling and channel-forming codes.

Further, the antenna data memory is configured to store delayed antenna data;

the antenna data read-write control module is configured to accelerate the reading of the delayed antenna data stored in the antenna data memory under the control of the accelerated read / repeat module of the antenna data, as well as to transmit the delayed antenna data to the antenna data buffering module;

the control channel symbol processing module is configured to perform channel estimation and add the maximum signal to noise ratio of the control channel data, as well as to obtain TFCI symbol data in the control channel and transmit TFCI symbol data to the TFCI decoding module;

the TFCI decoding module is configured to decode the input data of the TFCI symbols to obtain the actual coefficient of expansion (SF) of the data channel corresponding to the control channel, and for transmitting the actual coefficient SF to the user parameter control module;

the user parameter management module is configured to transmit the actual coefficient of the data channel SF to the module for generating scrambling and channelization codes; and

the multipath demodulation module is configured to output the final symbols of the data channel in accordance with the data of the data channel obtained by calculating the correlation demodulation based on the scrambling and channel-forming codes generated using the actual coefficient SF.

In this case, the ratio of the number of data channel chips in the memory unit to the number of control channel chips in the memory unit in the antenna data buffering module is equal to the ratio of the rate of input of the delayed antenna data to the antenna data buffering module to the rate of input of the delayed antenna data to the antenna data buffering module; and

the ratio of the number of delayed antenna data chips demodulated by the multipath demodulation module per synchronization cycle to the number of unexpired antenna data chips demodulated by the multipath demodulation module per synchronization cycle is equal to the ratio of the rate of input of the delayed antenna data to the antenna data buffering module to the rate of input of the delayed antenna data to the module buffering antenna data.

The present invention also provides a method for receiving mixed services based on a wideband code division multiple access system with a RAKE receiver, comprising the following steps:

step 1, buffering the delayed antenna data of the same frame, which is twice accelerated to be read and used to demodulate the data channels of various types of services, as well as buffering the delayed antenna data to demodulate the control channel;

step 2, multipath demodulation of the buffered antenna data in accordance with the multipath parameters, antenna data of the corresponding multipath components, scrambling and channelization codes, and the corresponding output of the control channel data and data channel data; moreover, the demodulation of the delayed antenna data related to the data channel is accelerated; and

step 3, obtaining the actual coefficient of expansion (SF) of the data of the data channel in accordance with the symbols of the multipath demodulation of the control channel, performing channel estimation and addition by the maximum signal to noise ratio, obtaining TFCI symbols from the control channel, decoding TFCI symbols to obtain the actual SF coefficient the corresponding data channel, the formation of scrambling and channel-forming codes, demodulation and the final output of the data of the data channel.

The multipath components include the multipath components of the control channel, the multipath components of the uplink data channel of the high speed service, and the multipath components of the uplink data channel of the service using the R99 protocol.

The specified method may also include:

in step 1, the acceleration of reading the delayed antenna data of one frame used to demodulate the upstream data channel of the high-speed service in the first half of the frame interval, and the acceleration of reading the delayed antenna data of one frame used to demodulate the upstream data channel of the service in the second half frame spacing.

The specified method also includes:

in step 1, during buffering, providing one memory block for each multipath component of the delayed antenna data, wherein each memory block stores m data chips, as well as providing one memory block for each multipath component of the delayed antenna data, with each memory block storing 2m data chips ;

in step 2, during multipath demodulation, for delayed antenna data, performing the calculation of the correlation demodulation of 2m antenna data chips based on 2m scrambling and channelization codes in accordance with the appropriate multipath parameters in each synchronization cycle, as well as outputting data channel data; and for undelayed antenna data, the calculation of the correlation demodulation of m chip antenna data based on m chips of scrambling and channel forming codes in accordance with the appropriate multipath parameters in each cycle, as well as the output of control channel data and data channel data; Where

m is the number of chips in the multipath demodulation correlator.

Besides,

in step 1, the ratio of the number of chips in the memory block storing the chips of the data channel to the number of chips in the block of memory storing the chips of the control channel is equal to the ratio of the buffering speed of the delayed antenna data to the buffering speed of the delayed antenna data;

in step 2, during multipath demodulation, the ratio of the number of delayed antenna data chips demodulated during the synchronization cycle to the number of delayed antenna data chips demodulated during the synchronization cycle is equal to the ratio of the delayed antenna data buffering rate to the delayed antenna data buffering rate.

The present invention overcomes the disadvantages of a standard RAKE receiver using a simultaneous demodulation mode that requires a relatively large amount of memory resources, as well as a standard RAKE receiver using a delay demodulation mode that requires a relatively long processing time; and the requirement for processing time of the upstream data channels of high-speed services via the R6 protocol and subsequent WCDMA protocols is satisfied, in addition, the present invention adds a small amount of hardware resources, and management and execution are relatively simple.

Brief Description of the Drawings

1 is a block diagram of a standard RAKE receiver employing a simultaneous demodulation mode in a WCDMA system.

2 is a block diagram of a standard RAKE receiver employing a delay demodulation mode in a WCDMA system.

FIG. 3 is a block diagram of a mixed-service RAKE receiver supporting an uplink high-speed service data channel and an R99 uplink service data channel in a WCDMA system in accordance with an embodiment of the present invention.

4 (a) is a diagram for explaining the timing of the acceleration / repeat control in the accelerated read / repeat module of the antenna data in the RAKE receiver in accordance with the present invention.

4 (b) is a diagram for explaining the synchronization of the multipath demodulation module in the RAKE receiver for accelerated demodulation of the uplink data channel of a high speed service / data channel of a service according to the R99 protocol in accordance with the present invention.

5 is a diagram illustrating a comparison of the structure of the antenna channel buffering data of the control channel in the antenna data buffer module in the prior art RAKE receiver and in the RAKE receiver in accordance with the present invention.

6 is a diagram illustrating a comparison of the buffering structure of the antenna data of the data channel in the antenna data buffering module in the prior art RAKE receiver and in the RAKE receiver in accordance with the present invention.

7 is a diagram illustrating a comparison of the multipath synchronization of the control channel in the multipath demodulation module in the RAKE receiver of the prior art and in the RAKE receiver in accordance with the present invention.

FIG. 8 is a diagram illustrating a comparison of the synchronization of control of the multipath parameters of a data channel in the multipath parameter control module in the prior art RAKE receiver and in the RAKE receiver in accordance with the present invention.

Preferred Embodiments

For the standard RAKE receivers shown in FIGS. 1 and 2, it is seen that the main advantage of the RAKE receiver using the simultaneous demodulation mode is that it satisfies the processing time requirement of the uplink data channels of the high-speed service using the R6 protocol and subsequent 3GPP protocols , and the main advantage of the RAKE receiver, which uses the delay demodulation mode, is that such a receiver does not require the transfer and storage of large amounts of data.

At the same time, the processing time of the RAKE receiver using the delay demodulation mode does not satisfy the time requirements for the upstream data processing of the high-speed R6 protocol service and subsequent 3GPP protocols, and, therefore, it is necessary to reduce the processing time of the RAKE receiver using the delay demodulation mode. A RAKE receiver using a delayed demodulation mode saves the antenna data for one frame in order to demodulate it after the corresponding DPDCH receives the actual SF and the input and demodulation rate of the delayed antenna data in a standard RAKE receiver using a demodulation mode with the delay is equal to the input rate of the undelayed antenna data, and therefore, the total demodulation execution time is quite large. Thus, if the input speed and multipath demodulation of the delayed antenna data in the uplink data channel of the high-speed service is increased, the overall execution time of the demodulation of the uplink data channel of the high-speed service will be reduced, and the processing time requirement of the uplink data channels of the high-speed service of the R6 protocol and subsequent 3GPP protocols may be satisfied.

Based on the above analysis, the following approach is used in the technical scheme of the present invention.

On the one hand, a delayed demodulation mode is applied, which eliminates the problem that in the simultaneous demodulation mode only the minimum SF coefficient can be used to demodulate the E-DPDCH, and therefore a large number of data symbols are generated, as well as a large amount of data for transmission and storage.

On the other hand, to reduce the demodulation time based on the delayed demodulation mode, an accelerated demodulation mode is applied for the delayed antenna data in the uplink data channel of the high speed service, as a result, the processing time of the uplink data channel of the high speed service (such as E-DPCH in the R6 protocol) can satisfy requirement of the R6 protocol and subsequent protocols.

For example, the input rate of delayed antenna data can be doubled; the input of the delayed antenna data in the first half of the frame is used to demodulate the uplink data channel of the high-speed service, and the input of the delayed antenna data in the second half of the frame is used to demodulate the data channel of the service according to the R99 protocol; likewise, demodulation is accelerated so that the demodulation of the data of one frame is performed in half the frame interval.

The technical scheme of the present invention is described in detail below using the accompanying drawings and embodiments. In this embodiment, it is assumed that the input rate of the delayed antenna data is twice as fast as the input rate of the unattended antenna data, and the correlation length in the multipath demodulation module is m chips.

FIG. 3 is a schematic diagram of a mixed service RAKE receiver supporting an uplink high speed service data channel and an R99 uplink service data channel in a WCDMA system in accordance with an embodiment of the present invention.

As shown in FIG. 3, the mixed-service RAKE receiver includes: an antenna read / write accelerated module, antenna data read-write control module, antenna data memory module, antenna data buffer module, multipath parameter control module, multipath demodulation module, formation module scrambling and channel-forming codes, a control channel symbol processing module, a user parameter management module, and a TFCI decoding module.

In this case, the multipath demodulation module is connected to the multipath parameter control module, the antenna data buffering module, the control channel symbol processing module, and the scrambling and channelization code generating module; the antenna data memory is connected to the antenna data buffering module and the antenna data read-write control module; the module for accelerated reading / repeating of antenna data is connected to the module for reading-writing antenna data; a TFCI decoding module is coupled to a control channel symbol processing module and a user parameter management module; the user parameter control module is connected to the scrambling and channelization code generating module, and the multipath parameters control module is connected to the antenna data buffering module, the multipath demodulation module, and the scrambling and channelization code generating module.

The antenna data memory, the antenna data read-write control module, the multipath demodulation module, the scrambling and channelization code generating module, the user parameter control module, the control channel symbol processing module and the TFCI decoding module in the mixed-service RAKE receiver of FIG. 3, are identical to the corresponding modules in a standard RAKE receiver using a delay demodulation mode.

The module for accelerated reading / repeating of antenna data is a new module introduced in the present invention; and the antenna data buffering module and the multipath parameter management module in the RAKE receiver for mixed services in accordance with the present invention have new functions compared to their counterparts in a standard RAKE receiver employing a delay demodulation mode. Wherein:

The accelerated antenna data read / repeat module is used to generate a control signal that causes the read-write antenna data control module to accelerate the reading or repeat the accelerated reading of the delayed antenna data stored in the antenna data memory. It divides the time interval of one frame into exactly two parts, i.e. each part is equal to half the time interval of the frame, and these two parts are, respectively, the time interval of accelerated processing and the time interval of repeated accelerated processing.

The multipath control module is used to transmit the multipath parameters of the data channels of various services to the multipath demodulation module twice in accordance with various types of services in order to control the demodulation rate of the control channel and the data channel in the multipath demodulation module. In this case, when demodulating the control channel and the data channel, different chip lengths are used. The parameters provided by the multipath parameter control module control the demodulation of the control channel with a length of m chips, and the parameters provided for the data channel control demodulation with a length of 2 chips; whereas the standard RAKE receiver uses the same chip length to demodulate the data channel and the control channel. Moreover, the multipath parameter control module sends multipath parameters to the antenna data buffering module in accordance with various types of services to control the antenna data buffering. Also, the multipath parameter control module, together with the user parameter control module, controls the generation of the corresponding scrambling and channelization codes, which are necessary for the corresponding multipath demodulation module, in the scrambling and channel forming codes module.

The antenna data buffering module differs from its counterpart in a standard RAKE receiver by the method of buffering antenna data, since the input of delayed antenna data is accelerated; during buffering, each multipath component of the control channel requires only one memory block that stores antenna data with a length of m chips for subsequent multipath demodulation; for the multipath components of the data channel, the input of the delayed antenna data is doubled, therefore, each multipath component requires one memory block that stores data with a length of 2m chips for subsequent multipath demodulation.

In the RAKE receiver of FIG. 3, antenna data memory is used to store delayed antenna data. The delayed antenna data is written to the antenna data memory under the control of the antenna data read-write control module. The module for accelerated reading / repeating of antenna data sends a control signal for accelerating / repeating the antenna data to the module for reading and writing antenna data to speed up the output of the delayed antenna data stored in the antenna data memory to the antenna data buffering module, while the output antenna the data is identical every time.

Under the control of the antenna data read-write control module, the accelerated output delayed antenna data is transmitted from the antenna data memory to the antenna data buffer module for buffering, and the antenna data of the respective multipath components are read in accordance with the multipath parameters provided by the multipath parameters control module. The read antenna data is transmitted to the multipath demodulation module. At the same time, under the control of the multipath parameters control module, the scrambling and channel forming codes generation module generates, in accordance with the multipath parameters provided by the multipath parameters control module, the scrambling and channel forming codes used to demodulate the corresponding multipath components and transmits them to the multipath demodulation module.

The multipath demodulation module performs a correlation operation of the input antenna data scrambling and channel forming codes in accordance with the multipath parameters provided by the multipath parameters control module, and outputs control channel data and data channel data, respectively. In this case, the control channel data is transmitted to the control channel symbol processing module for channel estimation and addition by the maximum signal to noise ratio, and the received control channel TFCI symbol data is sent to the TFCI decoding module.

The TFCI decoding module performs decoding of the input symbols, obtains the actual coefficient SF of the data channel corresponding to this control channel, and transfers it to the user parameter control module. The user parameter control module obtains the actual coefficient of the data channel SF and transfers it to the module for generating scrambling and channelization codes to generate the channelization code. As a result, the multipath demodulation module outputs data channel symbols.

Figure 3 is a diagram of a method for receiving mixed service channels in a RAKE receiver for mixed services in accordance with the present invention. As shown in figure 3, this method includes the following steps:

S301, storing the input antenna data in the antenna data memory under the control of the antenna data read-write control module, as well as transmitting the input undetected antenna data and the delayed antenna data stored in the antenna data memory to the antenna data buffering module for subsequent multipath demodulation.

In this case, the antenna data in the control channel goes directly to the antenna data buffering module, and the antenna data with a delay stored in the antenna data memory is output to the antenna data buffering module under the control of the antenna data fast reading / repeating module. If it is necessary to accelerate the output of delayed antenna data to the antenna data buffering module, the read-write antenna data control module increases the speed of reading the delayed antenna data from the antenna data memory in the first half of the frame interval and outputs the delayed antenna data to the antenna data buffering module; and after the accelerated reading of the delayed antenna data during the first interval is completed, the antenna data read-write control module receives a command to repeat the accelerated reading of the delayed antenna data that has already been read in the first half of the frame in the second half of the frame and outputs these delayed antenna data into the antenna data buffering module.

S302, storing in the antenna data buffering module, in accordance with the correlation length in the multipath demodulation module, directly the input antenna data of the control channel (unavailable antenna data) and the antenna data of the data channel that are rapidly input after the delay memory; as well as storing in the control module multipath parameters of multipath parameters of each type in accordance with the types of services of the antenna data channels.

The types of antenna data channel services include a control channel, an uplink high-speed service data channel, an uplink service data channel using the R99 protocol (standard uplink service data channel).

Moreover, for directly inputted antenna data of the control channel, each antenna data buffering unit stores m antenna data chips. To enter delayed antenna data at double speed, each antenna data buffering unit stores 2m antenna data chips, since the amount of antenna data per unit time is doubled compared to the direct input antenna data of the control channel, and as a result, the requirement of accelerated demodulation of multipath components corresponding to these antenna data.

S303, in each synchronization cycle, reading the antenna data (m chips for the control channel and 2m chips for the data channel) stored in one buffer unit of the antenna data, the antenna data buffering module and outputting this antenna data to the multipath demodulation module, reading by the multipath parameters control module multipath parameter and its output to the multipath demodulation module; and also control of the user parameter control module, together with the multipath parameter control module, generation of the corresponding scrambling and channel forming codes in the module for generating scrambling and channel forming codes, which are necessary for the corresponding multipath demodulation module.

Moreover, the user parameter management module controls the generation of the scrambling and channelization codes mainly in accordance with the number of scrambler and the actual coefficient SF of the user. The multipath parameter control module mainly controls the length of the generated scrambling and channelization codes. For the control channel, scrambling and channel-forming codes of size m chips are generated in each synchronization cycle, while for the data channel, scrambling and channel-forming codes of size 2m chips are generated in each synchronization cycle, and the module for generating scrambling and channel-forming codes receives a command to transmit the generated scrambling and channel-forming codes codes in the multipath demodulation module.

S304, the multi-beam demodulation module performs correlation demodulation of the input antenna data based on the scrambling and channel-forming codes under the control of the multi-beam parameter control module; and in accordance with various channelization code, accumulation of multipath demodulation results of DPCCH and E-DPCCH channels in symbols; or accumulating the results of multipath demodulation of the DPDCH service channel according to the R99 protocol and the E-DPDCH channel of a high-speed service (such as R6) transmitting the uplink data to symbols, and transmitting these symbols to the respective subsequent processing modules.

At the same time, for the DPCCH and E-DPCCH channels in each synchronization cycle, the operation of correlation of m antenna data chips and m scrambling and channel-forming codes is required; and for DPDCH in the R99 service and E-DPDCH in the high-speed uplink data service in each synchronization cycle, a correlation operation of 2m antenna data chips and 2m scrambling and channelization codes is required.

S305, transmitting the symbols obtained by multipath demodulation of the control channel to the control channel symbol processing module for channel estimation, adding the maximum signal to noise ratio and extracting TFCI symbols to obtain all TFCI symbols in one frame or one TTI interval; transmitting the TFCI symbols to the TFCI decoding module for decoding them, obtaining the actual SF coefficient of the corresponding DPDCH and E-DPDCH, and transmitting the actual SF coefficient to the user parameter control module to control the generation of scrambling and channelization codes for DPDCH and E-DPDCH; as well as directly outputting the characters obtained as a result of multipath demodulation of the data channel for subsequent system processing.

FIG. 4 (a) is a diagram illustrating timing of acceleration / repeat control for an accelerated read / repeat module of antenna data in an RAKE receiver of the present invention. 4 (b) is a diagram illustrating the synchronization of the multipath demodulation module in the RAKE receiver of the present invention for accelerated demodulation of the uplink data channel of a high speed service / service data channel according to the R99 protocol. Figure 4 shows that under the control of the module for accelerated reading / repeating of antenna data, the input rate of the antenna data after the delay t is equal to twice the input rate of the unattended antenna data, so for antenna data in one frame only half the time, i.e. half the frame time interval is required for faster reading of antenna data. The corresponding multipath demodulation module requires only half the frame time interval to demodulate the uplink data channel of a high speed service (such as E-DPDCH in R6). In the second half of the frame time interval, the accelerated reading of the antenna data is repeated, and the corresponding multipath demodulation module also performs demodulation of the service data channel according to the R99 protocol for this half of the frame time interval.

5 is a diagram illustrating a comparison of the structure of the antenna channel buffering data of the control channel in the antenna data buffer module in the prior art RAKE receiver and in the RAKE receiver of the present invention. In the drawing, the numbers 0, 1, ..., n-1 are the numbers of the input antennas corresponding to the antenna data streams with numbers 0, 1, ..., n-1.

In a standard RAKE receiver, each multipath component of a control channel corresponds to one memory block, and each memory block stores m data chips for subsequent multipath demodulation, as shown in FIG. 5 (a).

In the RAKE receiver of the present invention, each multipath component of the control channel also corresponds to one memory block, and each memory block stores m data chips for subsequent multipath demodulation, as shown in FIG. 5 (b).

6 is a diagram illustrating a comparison of the buffering structure of the antenna data of the data channel in the antenna data buffering module in the prior art RAKE receiver and in the RAKE receiver of the present invention.

In a standard RAKE receiver, each multipath component of a data channel corresponds to one memory block, and each memory block stores m data chips for subsequent multipath demodulation, as shown in FIG. 6 (a).

In the RAKE receiver of the present invention for multipath components of a data channel, each memory unit corresponding to one multipath component stores 2m data chips for subsequent multipath demodulation, since delayed antenna data is entered at double speed, as shown in Fig. 6 (b).

7 is a diagram illustrating a comparison of the multipath synchronization of the control channel in the multipath demodulation module in the RAKE receiver of the prior art and in the RAKE receiver of the present invention.

In a standard RAKE receiver, the multipath parameters of the control channel are formed into a sequence set by the user, and then the multipath demodulation module performs multipath demodulation in accordance with the parameters sequentially sent by the multipath parameters control module, as shown in Fig. 7 (a).

In the RAKE receiver of the present invention, the control channel has a multipath parameter control algorithm similar to a standard RAKE receiver, as shown in FIG. 7 (b).

FIG. 8 is a diagram illustrating a comparison of the synchronization of control of the multipath parameters of a data channel in the multipath parameter control module in the RAKE receiver of the prior art and in the RAKE receiver of the present invention.

In a standard RAKE receiver, the multipath parameters of the data channel are formed into a sequence set by the user, and then the multipath demodulation module performs multipath demodulation in accordance with the multipath parameters sequentially sent by the multipath parameters control module, as shown in Fig. 8 (a).

In the RAKE receiver of the present invention, a multipath parameter list of a high-speed service uplink data channel (such as E-DPDCH) and a multipath parameter list of a service data channel are created using the R99 protocol for a data channel. In this case, the list of multipath parameters of the uplink data channel of a high-speed service (such as E-DPDCH) is used to control demodulation in the multipath demodulation module in the first half of the frame, and the list of multipath parameters of the data channel of the service via the R99 protocol is used to control demodulation in the multipath demodulation module in the second half frame. Therefore, in the first half of the frame, the multipath demodulation module reads the multipath parameters from the list of multipath parameters of the uplink data channel of a high speed service (such as E-DPDCH) to perform multipath demodulation, as shown in Fig. 8 (b); and in the second half of the frame, the multipath demodulation module reads the multipath parameters from the list of multipath parameters of the service data channel according to the R99 protocol for performing multipath demodulation, as shown in Fig. 8 (c).

Thus, the processing time of the upstream data channel of the high-speed service is reduced by half the frame, and as a result, the time requirement for the processing of the upstream data channels of the high-speed services of the R6 protocol and subsequent WCDMA protocols is satisfied, and hardware resources are saved compared to the standard RAKE receiver.

Industrial applicability

The present invention addresses the disadvantages of a standard RAKE receiver employing a simultaneous demodulation mode that requires a relatively large amount of memory resources, and a standard RAKE receiver employing a delay demodulation mode that requires a relatively long processing time; and the present invention satisfies the processing time requirement of the upstream data channels of the high-speed service of the R6 protocol and subsequent WCDMA protocols, moreover, the present invention requires the addition of only a small amount of hardware resources, and their management and implementation are relatively simple.

Claims (10)

1. RAKE receiver for mixed services based on a broadband code division multiple access system, including antenna data read-write control module, antenna data memory module, antenna data buffering module, multipath demodulation module, scrambling and channel-forming code generation module, parameter control module a user, a control channel symbol processing module, and a transport format combination indicator (TFCI) decoding module, the receiver also including an accelerated antenna data read / repeat module associated with the antenna data read-write control module and a multipath parameter control module, respectively associated with an antenna data buffering module, a multipath demodulation module, and a scrambling and channelization code generating module, wherein:
the module for accelerated reading / repeating of antenna data is configured to transmit a control signal to the module for reading and writing antenna data twice during one frame; and each time when the antenna data read-write control module receives this control signal, the delayed antenna data of one frame stored in the antenna data memory is rapidly output to the antenna data buffering module;
the multipath parameter control module is configured to store multipath parameters for various types of services, for transmitting multipath parameters to the antenna data buffering module for controlling the reading of antenna data in accordance with different types of services, for transmitting multipath parameters to the multipath demodulation module and for controlling, together with the module control of user parameters, the formation of scrambling and channel-forming codes, which are required for the corresponding module nogoluchevoy demodulation module forming the scrambling and channelization codes;
the antenna data buffering module is configured to buffer undelayed antenna data and antenna data that are rapidly input after the delay storage device; moreover, for the antenna data of the control channel, each multipath component is assigned one memory block, and each memory block stores m data chips; and for the antenna data, which is rapidly introduced after the delay storage device, each multipath component is assigned one memory block, and each memory block stores 2m data chips, where m is the number of chips in the correlator of the multipath demodulation module. 2. The RAKE receiver according to claim 1, in which
an accelerated antenna data read / repeat module transmits a control signal to each half of the frame time interval to allow the antenna data read / write control module to accelerate the output of delayed antenna data stored in the antenna data memory to demodulate the uplink data channel of a high-speed service, as well as to speed up the output delayed antenna data stored in the antenna data memory for demodulating the uplink service data channel using the R99 protocol. 3. The RAKE receiver according to claim 1, in which
in accordance with the multipath parameters transmitted by the multipath parameters control module and the corresponding scrambling and channel forming codes generated by the scrambling and channel forming codes generating module, the multipath demodulation module performs correlation demodulation of the delayed antenna data and the accelerated input delayed antenna data and accordingly outputs the data of the channel data channel; at the same time, for delayed antenna data, each synchronization cycle calculates the correlation demodulation of 2m antenna data chips based on 2m scrambling and channel-forming codes; and for undelayed antenna data, each synchronization cycle calculates the correlation demodulation of m antenna data chips based on m chips of scrambling and channelization codes. 4. The RAKE receiver according to claim 3, in which
antenna data memory is configured to store delayed antenna data;
the antenna data read-write control module is configured for accelerated reading of the delayed antenna data stored in the antenna data memory under the control of the accelerated reading / repeating module of the antenna data and for transmitting the delayed antenna data to the antenna data buffering module;
the control channel symbol processing module is configured to perform channel estimation and add the maximum signal to noise ratio of the control channel data, as well as to obtain TFCI symbols from the control channel and transmit TFCI symbols to the TFCI decoding module;
the TFCI decoding module is configured to decode the input TFCI characters to obtain the actual expansion coefficient (SF) of the data channel corresponding to the control channel, as well as to transmit the actual SF coefficient to the user parameter control module;
the user parameter management module is configured to transmit the actual coefficient of the data channel SF to the module for generating scrambling and channelization codes; and
the multipath demodulation module is configured to finally output the data of the data channel symbols in accordance with the data of the data channel obtained by calculating the correlation demodulation based on the scrambling and channel-forming codes generated on the basis of the actual coefficient SF. 5. The RAKE receiver according to claim 3, in which
the ratio of the number of data channel chips in the memory unit to the number of control channel chips in the memory unit in the antenna data buffering module is equal to the ratio of the rate of input of the delayed antenna data to the antenna data buffering module to the rate of input of the delayed antenna data to the antenna data buffering module; and
the ratio of the number of delayed antenna data chips demodulated by the multipath demodulation module per synchronization cycle to the number of unexpired antenna data chips demodulated by the multipath demodulation module per synchronization cycle is equal to the ratio of the rate of input of the delayed antenna data to the antenna data buffering module to the rate of input of the delayed antenna data to the module buffering antenna data. 6. A method for receiving mixed services based on a wideband code division multiple access system with a RAKE receiver, comprising the following steps:
step 1, buffering the delayed antenna data of the same frame, which is twice accelerated to be read and used to demodulate the data channels of various types of services, as well as buffering the delayed antenna data to demodulate the control channel;
step 2, multipath demodulation of the buffered antenna data in accordance with multipath parameters, antenna data of the corresponding multipath components, scrambling and channel forming codes, and outputting, respectively, the data of the control channel and data of the data channel; wherein the demodulation of the delayed antenna data related to the data channel is accelerated; and
step 3, obtaining the actual expansion coefficient (SF) of the data channel in accordance with the symbols of the multipath demodulation of the control channel, performing channel estimation and addition according to the maximum signal to noise ratio, obtaining TFCI symbols from the control channel, decoding TFCI symbols to obtain the actual SF coefficient of the corresponding channel data, the formation of scrambling and channel-forming codes, demodulation and the final output of data channel data. 7. The method according to claim 6, in which:
the multipath components include the multipath components of the control channel, the multipath components of the uplink data channel of the high speed service, and the multipath components of the data channel of the service according to the R99 protocol. 8. The method according to claim 7, also including:
in step 1, accelerating the reading of the delayed antenna data of one frame used to demodulate the uplink data channel of the high-speed service in the first half of the frame interval, and accelerating the reading of the delayed antenna data of the same frame used to demodulate the uplink data channel of the service using the R99 protocol, to the second half frame interval. 9. The method according to claim 6, also including:
in step 1, during buffering, providing one memory block for each multipath component of the unavailable antenna data, wherein each memory block stores m data chips, as well as providing one memory block for each multipath component of the delayed antenna data, with each memory block storing 2m data chips;
in step 2, during multipath demodulation, for delayed antenna data, performing a calculation of the correlation demodulation of 2m antenna data chips and 2m scrambling and channel-forming codes in accordance with the corresponding multipath parameters in each synchronization cycle and outputting data channel data; and for non-delayed antenna data, the calculation of the correlation demodulation of m antenna data chips based on m chips of scrambling and channelization codes using the corresponding multipath parameters in each synchronization cycle and the output of the control channel data and data channel data, where m is the number of chips in the multipath demodulation correlator . 10. The method according to claim 6, in which:
in step 1, the ratio of the number of chips in the memory block storing the chips of the data channel to the number of chips in the memory block storing the chips of the control channel is equal to the ratio of the rate of input of the delayed antenna data to the buffer to the speed of the input of the delayed antenna data to the buffer;
in step 2, during multipath demodulation, the ratio of the number of delayed antenna data chips demodulated during the synchronization cycle to the number of delayed antenna data chips demodulated during the synchronization cycle is equal to the ratio of the rate of input of the delayed antenna data to the buffer and the rate of input of the delayed antenna data to the buffer.

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