CN106161301A - Apparatus and method in wireless communication system and wireless communication system - Google Patents

Abstract

Provide the apparatus and method in a kind of wireless communication system and wireless communication system.Wherein, the device of the receiving terminal in a kind of wireless communication system includes: filter process unit, is configured to, with analysis filterbank, the input signal from transmitting terminal is filtered device and processes, to obtain the multichannel subband signal with front-end information；Front-end information removal unit, is configured to remove the front-end information in multichannel subband signal；And interference removal unit, be configured to be united by the frequency-region signal of the multichannel subband signal after eliminating front-end information be processed to remove intersubband interference.According to embodiment of the disclosure, it is possible to achieve in bank of filters uses the system of non-fully Configuration design, realize signal detection with the design of simple receiving terminal, thus improve the motility of system design and optimize systematic function.

Description

Wireless communication system, and apparatus and method in wireless communication system

Technical Field

The present disclosure relates to the field of wireless communication technologies, and in particular, to a wireless communication system in which a filter bank is designed using a Non-Perfect Reconstruction (NPR), and an apparatus and method for a receiving end and a transmitting end in the wireless communication system.

Background

The Filter Bank (FB) is a multi-rate signal processing technique with great application prospect. Similar to Orthogonal Frequency Division Multiplexing (OFDM) technology, which converts high-speed serial data into low-speed parallel data, a filter bank separates the input signal stream into multiple sub-signal streams, one sub-signal stream being carried by each single Frequency sub-band. However, unlike OFDM systems, the spectrum of each subband of the filter bank is well-allocated so that aliasing only exists between adjacent subbands. Due to this property, Inter-Subband Interference (Inter-Subband Interference) comes only from adjacent subbands, so FB is more robust than OFDM in frequency offset; furthermore, due to the well-allocated fixed frequency division, FB is more robust than OFDM in terms of narrowband interference.

Due to the non-orthogonality of FB, the filter bank is generally required to have Perfect Reconstruction (PR) characteristics during the design process of the filter bank coefficients. However, in practical system applications, due to the effects of the channel, plus the need to handle ISI, the full reconstruction characteristics cannot be maintained. In addition, some applications require non-uniform or even time-varying spectrum allocations. Therefore, if the constraints of a fully reconfigured design can be overcome, a more flexible non-fully reconfigured design can be used directly.

Due to ISI caused by the NPR design, and the frequency selectivity of the channel, symbol detection at the receiving end can be very difficult.

Disclosure of Invention

The following presents a simplified summary of the disclosure in order to provide a basic understanding of some aspects of the disclosure. However, it should be understood that this summary is not an exhaustive overview of the disclosure. It is not intended to identify key or critical elements of the disclosure or to delineate the scope of the disclosure. Its sole purpose is to present some concepts of the disclosure in a simplified form as a prelude to the more detailed description that is presented later.

In view of the above problems, it is an object of the present disclosure to provide an apparatus and method for facilitating receiver symbol detection in a wireless communication system in which a non-perfect reconstruction design is adopted for both an analysis filter bank of a receiver and an integration filter bank of a transmitter.

According to a first aspect of the present disclosure, there is provided an apparatus at a receiving end in a wireless communication system, comprising: a filter processing unit configured to filter an input signal from a transmitting end with an analysis filter bank to obtain a plurality of sub-band signals with front-end information; a front-end information removing unit configured to remove front-end information in the multi-path sub-band signal; and an interference removing unit configured to remove inter-subband interference by processing by combining together the frequency domain signals of the plurality of sub-band signals from which the front-end information is removed.

According to the preferred embodiment of the present disclosure, the apparatus at the receiving end further includes: and the signal recovery unit is configured to perform frequency-domain-to-time-domain conversion and demodulation processing on the frequency-domain signal subjected to the inter-subband interference removal so as to recover an original input signal of the input signal at the transmitting end.

According to another preferred embodiment of the present disclosure, the interference removing unit is further configured to, for each path of subband signals from which the front-end information is removed, determine the path of subband signals according to the input signals of the relevant subbands and the equivalent channel impulse responses of the input subbands of the relevant subbands with respect to the path of subband signals, perform time-domain to frequency-domain conversion to obtain frequency-domain signals of each path of subband signals, and jointly process the frequency-domain signals of all the subband signals to remove inter-subband interference.

According to another preferred embodiment of the present disclosure, for each path of subband signals from which front-end information is removed, the related subband includes the path of subband itself and adjacent subbands of the path of subband.

According to another preferred embodiment of the present disclosure, the interference removing unit is further configured to, for each path of subband signals from which the front-end information is removed, represent the path of subband signals as a sum of cyclic convolutions of input signals of related subbands and corresponding equivalent channel impulse responses and perform time-domain to frequency-domain conversion to obtain frequency-domain signals of each path of subband signals, and jointly process the frequency-domain signals of all the subband signals to remove inter-subband interference.

According to another preferred embodiment of the present disclosure, the apparatus at the receiving end further includes: and the equalization processing unit is configured to perform equalization processing on the input signal before the processing of the filter processing unit by using the time domain equalizer, so that the influence generated by the combination of the actual physical channel and the time domain equalizer is only the delay of the signal.

According to another preferred embodiment of the present disclosure, the apparatus at the receiving end further includes: a filter parameter setting unit configured to set prototype filter parameters related to design of prototype filters of the analysis filter bank and the synthesis filter bank according to a predetermined objective function; and a parameter notification unit configured to notify the transmitting end of the prototype filter parameter. Preferably, the prototype filter parameters include one or more of a number of subbands, a filter length, a subband center frequency, and a bandwidth.

According to another preferred embodiment of the present disclosure, the prototype filter parameters further include at least one of a transition band control factor, a pass band error to stop band error ratio, a pass band offset, a stop band error, and an error tolerance.

According to another preferred embodiment of the present disclosure, the apparatus at the receiving end further includes: a data block length setting unit configured to set a parameter related to a length of a data block in the input signal of each path of the subband signal. Preferably, the parameter notification unit further notifies the transmitting end of a parameter related to the length of the data block to add front end information according to the length of the data block by the transmitting end.

According to another preferred embodiment of the present disclosure, the length of the data block is equal to the number of points of the fast fourier transform employed by the interference removing unit.

According to another preferred embodiment of the present disclosure, the filter parameter setting unit is further configured to set the prototype filter parameter in response to a data connection request from the transmitting end or according to a predetermined data transmission condition.

According to another preferred embodiment of the present disclosure, the filter parameter setting unit is further configured to set filter bank parameters related to the synthesis filter bank and the analysis filter bank according to the prototype filter parameters.

According to another preferred embodiment of the present disclosure, the parameter notification unit is further configured to notify the transmitting end of filter bank parameters related to the synthesis filter bank.

According to another preferred embodiment of the present disclosure, the parameter notification unit is further configured to notify the transmitting end of the parameter optimization instruction to generate, by the transmitting end, parameters related to the synthesis filter bank based on a predetermined objective function according to the parameter optimization instruction and the prototype filter parameters.

According to another preferred embodiment of the present disclosure, the apparatus at the receiving end further includes: a channel estimation unit configured to estimate a channel condition according to a predetermined training sequence from a transmitting end to determine whether front-end information needs to be added when the transmitting end transmits a signal, wherein the predetermined training sequence is added with the front-end information by the transmitting end according to the received prototype filter parameters and is processed by the synthesis filter bank; and a mode notification unit configured to notify the transmitting end of an indication whether to adopt the mode with or without front end information when transmitting a signal, according to an estimation result of the channel estimation unit.

According to another preferred embodiment of the present disclosure, the analysis filter bank employs a non-perfect reconstruction design.

According to another preferred embodiment of the present disclosure, the front-end information is a cyclic prefix.

According to another aspect of the present disclosure, there is also provided an apparatus at a transmitting end in a wireless communication system, including: a front-end information adding unit configured to add front-end information to an input signal; a filter processing unit configured to filter-process the input signal to which the front-end information is added, with a synthesis filter bank; and a signal transmitting unit configured to transmit the input signal processed by the filter to a receiving end.

According to another aspect of the present disclosure, there is also provided a wireless communication system including: a transmitting end device configured to add front end information to an input signal, filter-process the input signal to which the front end information is added with a synthesis filter bank, and transmit the input signal processed by the filter to a receiving end device; and a receiving end device configured to filter an input signal from the transmitting end device with an analysis filter bank to obtain a plurality of sub-band signals with front end information, remove the front end information in the plurality of sub-band signals, and remove inter-sub-band interference by combining the frequency domain signals of the plurality of sub-band signals from which the front end information is removed.

According to another aspect of the present disclosure, there is also provided a method at a receiving end in a wireless communication system, including: a filter processing step for performing filter processing on an input signal from a transmitting end by using an analysis filter bank to obtain a multi-path sub-band signal with front-end information; a front-end information removing step for removing front-end information in the multi-path sub-band signals; and an interference removing step for removing inter-subband interference by combining the frequency domain signals of the plurality of paths of subband signals from which the front-end information is removed and processing the combined signals.

According to another aspect of the present disclosure, there is also provided a method of a transmitting end in a wireless communication system, including: a front-end information adding step of adding front-end information to the input signal; a filter processing step of performing filter processing on the input signal to which the front-end information is added, with a synthesis filter bank; and a signal transmitting step for transmitting the input signal processed by the filter to a receiving end.

According to another aspect of the present disclosure, there is also provided an electronic device comprising one or more processors configured to perform the functions of the above-described method or corresponding unit according to the present disclosure.

According to other aspects of the present disclosure, there are also provided computer program code and a computer program product for implementing the above-described method according to the present disclosure, and a computer readable storage medium having recorded thereon the computer program code for implementing the above-described method according to the present disclosure.

Additional aspects of the disclosed embodiments are set forth in the description section that follows, wherein the detailed description is presented to fully disclose the preferred embodiments of the disclosed embodiments without imposing limitations thereon.

Drawings

The disclosure may be better understood by reference to the following detailed description taken in conjunction with the accompanying drawings, in which like or similar reference numerals are used throughout the figures to designate like or similar components. The accompanying drawings, which are incorporated in and form a part of the specification, further illustrate preferred embodiments of the present disclosure and explain the principles and advantages of the present disclosure, are incorporated in and form a part of the specification. Wherein:

fig. 1 is a block diagram showing a functional configuration example of an apparatus at a transmitting end in a wireless communication system according to an embodiment of the present disclosure;

fig. 2 is a block diagram showing another functional configuration example of an apparatus at a transmitting end in a wireless communication system according to an embodiment of the present disclosure;

fig. 3 is a block diagram showing another functional configuration example of an apparatus at a transmitting end in a wireless communication system according to an embodiment of the present disclosure;

fig. 4 is a block diagram showing another functional configuration example of an apparatus at a transmitting end in a wireless communication system according to an embodiment of the present disclosure;

fig. 5 is a block diagram showing a functional configuration example of an apparatus at a receiving end in a wireless communication system according to an embodiment of the present disclosure;

fig. 6 is a block diagram showing another functional configuration example of an apparatus at a receiving end in a wireless communication system according to an embodiment of the present disclosure;

fig. 7 is a block diagram showing another functional configuration example of an apparatus at a receiving end in a wireless communication system according to an embodiment of the present disclosure;

fig. 8 is a block diagram showing another functional configuration example of an apparatus at a receiving end in a wireless communication system according to an embodiment of the present disclosure;

fig. 9 is a flowchart illustrating a process example of a method of a transmitting end in a wireless communication system according to an embodiment of the present disclosure;

fig. 10 is a flowchart illustrating a process example of a method of a receiving end in a wireless communication system according to an embodiment of the present disclosure;

fig. 11 is a block diagram showing a configuration example of a wireless communication system according to an embodiment of the present disclosure;

fig. 12 shows a signal processing flow in a wireless communication system according to an embodiment of the present disclosure;

fig. 13 is a flow chart illustrating an example of signaling interaction in a wireless communication system according to an embodiment of the present disclosure;

fig. 14 is a flow diagram illustrating another example of signaling interactions in a wireless communication system in accordance with an embodiment of the present disclosure;

fig. 15 is a flow diagram illustrating another example of signaling interactions in a wireless communication system in accordance with an embodiment of the present disclosure;

fig. 16 is a flow diagram illustrating another example of signaling interactions in a wireless communication system in accordance with an embodiment of the present disclosure;

fig. 17 is a block diagram showing an example structure of a personal computer as an information processing apparatus employable in the embodiments of the present disclosure;

18A and 18B show a spectral diagram of an integrated filter bank and a corresponding system bit error rate graph, respectively, in a first example scenario in which the techniques of the present disclosure are applied;

19A and 19B show a spectral diagram of an integrated filter bank and a corresponding system bit error rate graph, respectively, in a second example scenario in which the techniques of this disclosure are applied;

20A and 20B show a spectral diagram of an integrated filter bank and a corresponding system bit error rate graph, respectively, in a third example scenario in which the techniques of this disclosure are applied;

21A and 21B show a spectral diagram of an integrated filter bank and a corresponding system bit error rate graph, respectively, in a fourth example scenario in which the techniques of this disclosure are applied; and

fig. 22A and 22B show a spectral diagram of an integrated filter bank and a corresponding system bit error rate graph, respectively, in a fifth example scenario in which the techniques of this disclosure are applied.

Detailed Description

Exemplary embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in the specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.

Here, it should be further noted that, in order to avoid obscuring the present disclosure with unnecessary details, only the device structures and/or processing steps closely related to the scheme according to the present disclosure are shown in the drawings, and other details not so relevant to the present disclosure are omitted.

An embodiment of the present disclosure will be described in detail below with reference to fig. 1 to 22B.

First, a functional configuration example of an apparatus at a transmitting end in a wireless communication system according to an embodiment of the present disclosure will be described with reference to fig. 1. Fig. 1 is a block diagram showing a functional configuration example of an apparatus at a transmitting end in a wireless communication system according to an embodiment of the present disclosure.

As shown in fig. 1, the apparatus 100 at the transmitting end according to the present embodiment may include a front-end information adding unit 102, a filter processing unit 104, and a signal transmitting unit 106. A functional configuration example of each unit will be described in detail below.

The front-end information adding unit 102 may be configured to add front-end information to the input signal. Preferably, the front-end information may be a Cyclic Prefix (CP).

Specifically, assume that the input signal is a bit stream b of M paths_k(M) (k ═ 0,1, …, M-1), the input bitstream may be channel coded or channel uncoded, and the disclosure is not limited thereto. Then, preferably, the bit stream of each path can be mapped into M paths of complex stream signals x_k(M) (k ═ 0,1, …, M-1). However, it should be understood that this mapping process is optional, and the incoming bit stream may of course be sent directly without mapping. Next, the complex stream signal of each path is divided into a plurality of data blocks having a data block length of, for example, N, and the front-end information adding unit 102 may add front-end information (for example, Cyclic Prefix (CP)) having a length of, for example, Nc in front of each data block, that is, the front-end information adding unit 102 may add front-end information every data block length N. Here, the data block length N (for example, N may be 128, 256, etc.) and the length Nc of the front-end information may be, for example, a predetermined empirical value, or may be received from the receiving-end apparatus. Further, the length Nc of the front end information may also be determined as needed by an apparatus at the transmitting end, which will be described in detail in a later embodiment.

The filter processing unit 104 may be configured to filter-process the input signal to which the front-end information is added, with a synthesis filter bank.

Preferably, the synthesis filter bank may adopt a non-perfect reconstruction (NPR) design, thereby simplifying the design of the synthesis filter bank, and the form of the input bitstream at the transmitting end is also not limited (e.g., may be a complex form), and there is no need to perform any processing on the input bitstream (e.g., splitting the complex form of the input bitstream into a real number and an imaginary number, etc.), thereby improving the flexibility of design and use of the entire communication system. It is to be understood that the synthesis filter bank isThe specific design parameters may be predetermined, or may be received from the receiving end device, or may be determined by the apparatus at the transmitting end according to actual needs. Specifically, each data block to which front-end information is added by the front-end information adding unit 102 may be processed by the filter processing unit 104 in an integrated filter bank designed with NRP and having an upsampling factor M (e.g., the integrated filter bank is f)_kAnd (n) (k is 0,1, …, M-1)) to convert the M bit streams into one signal.

The signal transmitting unit 106 may be configured to send a signal integrated by the filter processing unit 104 into a channel for transmitting to a receiving end. The combined signal may pass through, for example, a channelIs transmitted and is simultaneously subject to interference from channel noise signals such as z (n).

Fig. 2 is a block diagram showing another functional configuration example of an apparatus at a transmitting end according to an embodiment of the present disclosure.

As shown in fig. 2, the apparatus 200 at the transmitting end according to this embodiment may include a parameter receiving unit 202, a front-end information adding unit 204, a filter processing unit 206, and a signal transmitting unit 208. Among them, functional configuration examples of the front-end information adding unit 204, the filter processing unit 206, and the signal transmitting unit 208 are substantially the same as those of the respective units shown in fig. 1, and a description thereof will not be repeated. Only a functional configuration example of the parameter receiving unit 202 will be described in detail below.

The parameter receiving unit 202 may be configured to receive prototype filter parameters related to design of prototype filters of the synthesis filter bank from the receiving end, and the filter processing unit 206 may perform filter processing with the synthesis filter bank according to the received prototype filter parameters.

The prototype filter parameters may include one or more of a number of subbands, a filter length, a subband center frequency, and a bandwidth. Wherein, the number M of sub-bands is generally even and corresponds to M synthesis filters and M analysis filters; the filter length Nf is typically an integer multiple of the number of subbands M. Further, preferably, the prototype filter parameters may further include at least one of a transition band control factor, a pass band error to stop band error ratio, a pass band deviation, a stop band error, an error tolerance, and the like. These parameters are all concepts well known in the art and will not be described in detail here. As an example, table 1 below gives an example of prototype filter parameters and associated description.

TABLE 1

It should be understood that, in the case where the relevant filter parameters used are predetermined, the filter processing may be performed on the input signal by directly using the synthesis filter group designed according to the predetermined relevant filter parameters without providing the parameter receiving unit 202.

Fig. 3 is a block diagram showing another functional configuration example of an apparatus at a transmitting end according to an embodiment of the present disclosure.

As shown in fig. 3, the apparatus 300 at the transmitting end according to this embodiment may include a parameter receiving unit 302, a filter bank parameter generating unit 304, a front-end information length determining unit 306, a front-end information adding unit 308, a filter processing unit 310, and a signal transmitting unit 312. Among them, the functional configuration examples of the parameter receiving unit 302, the front-end information adding unit 308, the filter processing unit 310, and the signal transmitting unit 312 are substantially the same as those of the respective units shown in fig. 2, and a description thereof will not be repeated. Only functional configuration examples of the filter bank parameter generation unit 304 and the front-end information length determination unit 306 will be described in detail below.

The filter bank parameter generating unit 304 may be configured to generate parameters related to the integrated filter bank based on a predetermined objective function according to the received prototype filter parameters and a parameter optimization instruction from the receiving end.

However, it should be understood that the filter bank parameter generating unit 304 is optional, and the parameters related to the synthesis filter bank may also be generated by the receiving-end device, and received from the receiving-end device by the parameter receiving unit 302.

Then, the filter processing unit 310 may filter-process the input signal using an synthesis filter bank designed according to the generated or received synthesis filter bank parameters.

The front-end information length determination unit 306 may be configured to determine the length of the front-end information based on the received prototype filter parameters.

As a preferred example, in order to minimize the loss of bandwidth utilization due to the addition of front-end information, the length Nc of the front-end information may preferably be the minimum value of the front-end information required when the channel length is 1.

Specifically, as a preferred example, the front-end information length determination unit 306 may determine the front-end information length adopting the minimum value according to the received prototype filter parameters, and the size thereof may be expressed as (2 × Nf-1)/M (where Nf is the filter length included in the prototype filter parameters and M is the number of subbands included in the prototype filter parameters) to cover the influence of the equivalent channel brought by the filter bank, which is the minimum value of the front-end information required when the channel length is 1. The front-end information length may be fixed to the minimum value without varying with the actual channel length. Note that in the case where (2 xnf-1)/M is not an integer, the front-end information length should be an integer value obtained after rounding up the value.

It can be seen that by determining the length of the front-end information to be the minimum value, the length of the front-end information no longer needs to satisfy the conventional constraint condition of being greater than or equal to the channel length, so that the length of the front-end information may not increase with the increase of the channel length, and the loss of bandwidth utilization may also be minimized.

It should be understood that although the length of the front-end information is determined by the apparatus at the transmitting end based on the received prototype filter parameters in this embodiment, it may alternatively be determined by the apparatus at the receiving end and the length of the front-end information is received from the receiving end by the parameter receiving unit 302, in which case the front-end information length determining unit 306 may be omitted. Further alternatively, the length of the front end information may be a predetermined empirical value, for example, 8.

Furthermore, preferably, the parameter receiving unit 302 may be further configured to receive a parameter related to the length of a data block in the input signal from the receiving end.

At this time, the front end information adding unit 306 may be further configured to add the front end information according to a parameter related to the length of the data block and the length of the front end information described above. The length of the data block is the parameter N, that is, the sending end adds front-end information with the minimum length every data block length N in each path of the bit stream. Further, it should be noted that the length N of the data block may be, for example, 128, 256, etc., which may be equal to the number of points used at the receiving end, such as Fast Fourier Transform (FFT) and Inverse Fast Fourier Transform (IFFT).

However, it should be understood that the present disclosure is not limited to this embodiment, and the length N of the data block may also be determined by the apparatus at the transmitting end, and at this time, the apparatus at the transmitting end needs to notify the receiving end of the determined length of the data block. That is, the length of the data block may be determined by the transmitting end or the receiving end, or may be predetermined as long as both parties of communication are consistent.

Note that, in the above example, the example in which the transmitting end adds the front-end information at the time of transmitting the signal is described, however, preferably, in actual communication, depending on the merits of the current channel conditions, the apparatus of the transmitting end according to the embodiment of the present disclosure may also switch to a mode in which the front-end information is not added at the time of transmitting the signal to obtain higher spectral efficiency. This example will be described below with reference to fig. 4.

Fig. 4 is a block diagram showing another functional configuration example of an apparatus at a transmitting end according to an embodiment of the present disclosure.

As shown in fig. 4, the apparatus 400 at the transmitting end according to this embodiment may include a parameter receiving unit 402, a front end information adding unit 404, a filter processing unit 406, a signal transmitting unit 408, and a mode receiving unit 410. The functional configuration examples of the parameter receiving unit 402, the front-end information adding unit 404, the filter processing unit 406, and the signal sending unit 408 are the same as the functional configuration examples of the corresponding units shown in fig. 2, and are not described again here. Only a functional configuration example of the mode receiving unit 410 will be described in detail below.

The mode receiving unit 410 may be configured to receive, from the receiving end, an indication of whether to employ a front-end information mode or a front-end information-less mode when the transmitting end transmits a signal, the indication being determined by the receiving end based on channel conditions estimated according to a predetermined training sequence.

Specifically, the transmitting end may first transmit a predetermined training sequence to the receiving end to estimate the current channel condition by the receiving end before formally transmitting a signal. After the front-end information adding unit 404 and the filter processing unit 406 at the transmitting end add front-end information to a predetermined training sequence according to the relevant parameters (e.g., prototype filter parameters, length of data block, synthesis filter bank parameters, front-end information length, etc.) received by the parameter receiving unit 402 and perform filter processing, the signal transmitting unit 408 transmits the training sequence thus processed to the receiving end to estimate the current channel condition from the received training sequence by the receiving end. Specifically, when the channel condition is good, for example, if a Signal to Interference plus Noise Ratio (SINR) is greater than a predetermined threshold, the transmitting end may be instructed to employ a front-end-information-free mode to obtain higher spectral efficiency; when the channel condition is not good, for example, the SINR is less than or equal to the predetermined threshold, the sending end may be instructed to use the mode with the front-end information to ensure the performance of the receiving end.

It can be seen that according to this embodiment, the sending end can switch between the mode with front-end information (requiring front-end information to be added to the input signal) and the mode without front-end information (not requiring front-end information to be added to the input signal) when sending signals according to the channel conditions, so that the system performance can be optimized.

The above describes a functional configuration example of an apparatus at a transmitting end according to an embodiment of the present disclosure, and the following correspondingly describes a functional configuration example of an apparatus at a receiving end according to an embodiment of the present disclosure.

Fig. 5 is a block diagram illustrating a functional configuration example of an apparatus at a reception end in a wireless communication system according to an embodiment of the present disclosure.

As shown in fig. 5, the apparatus 500 at the receiving end according to this embodiment may include a filter processing unit 502, a front-end information removing unit 504, and an interference removing unit 506.

The filter processing unit 502 may be configured to filter the input signal from the transmitting end with an analysis filter bank to obtain a plurality of subband signals with front-end information. Specifically, the input signal may be a path of signal obtained by adding front-end information at the transmitting end and processing the signal by the synthesis filter bank as described above. Preferably, in embodiments of the present disclosure, the analysis filter bank also employs a non-perfect reconstruction design. The input signal is passed through an analysis filterbank (e.g., analysis filterbank h)_k(n) (k 0,1, …, M-1)) is processed and converted into a complex symbol stream of M subbands with front-end information.

The front-end information removal unit 504 may be configured to remove front-end information in the multi-path subband signal. Specifically, as described above, the length of the data block is added to every data block length N at the transmitting endNc, so that the complex symbol stream of each subband can be divided into a plurality of data blocks with the length of (N + Nc), and then for each data block, the front end information is removed, thereby obtaining a data symbol y_k(m)(m＝0，1，…，N-1)。

The interference removing unit 506 may be configured to remove inter-subband interference by processing the frequency-domain signals of the plurality of subband signals from which the front-end information is removed by combining them together.

In particular, each subband signal y is due to the presence of inter-subband interference_k(m) not only its input signal x_k(m) and also to the input signals of one or more of its neighbouring subband signals. It should be noted that the input signal of the one or more adjacent subband signals may comprise not only the input signal x of the previous adjacent subband signal_k-1(m) input signal x followed by an adjacent subband signal_k+1(m) an input signal x which may also comprise two or more adjacent subband signals in front_k-2(m)、x_k-1(m) input signals x of equal and following two or more adjacent subband signals_k+1(m)、x_k+2(m), and the like. In the following detailed description of embodiments of the present disclosure, the input signal x of one adjacent subband signal is included with the input signal of one or more adjacent subband signals_k-1(m) input signal x followed by an adjacent subband signal_k+1(m) is described as an example, but the present disclosure is not limited thereto, and a person skilled in the art may also think of performing correlation processing based on more adjacent subband signals.

It should be understood that the time domain received signal y of the k sub-band at this time is obtained by adding front end information at the transmitting end and removing the front end information at the receiving end_k(m) may be expressed in the form of a sum of the input signal of the relevant sub-band and a cyclic convolution of the input sub-band of the relevant sub-band with respect to the equivalent channel impulse response of the kth sub-band, so that a very simple frequency domain calculation may be achieved after a time domain to frequency domain conversion. It is to be understood that it is this property that determines that all of the children may be addressed in embodiments of the present disclosureThe signal of band adopts the mode of joint processing to remove the interference between the sub bands.

Specifically, the interference removing unit 506 may be configured to, for each path of subband signals from which the front-end information is removed, determine the path of subband signals according to the input signals of the relevant subbands and the equivalent channel impulse responses of the input subbands of the relevant subbands with respect to the path of subband, perform time-domain to frequency-domain conversion to obtain frequency-domain signals of each path of subband signals, and jointly process the frequency-domain signals of all the subband signals to remove inter-subband interference. Preferably, for each path of subband signals from which front-end information is removed, the related subband may include the path of subband itself and adjacent subbands of the path of subband.

Further, the interference removing unit 506 may be configured to, for each path of subband signals from which the front-end information is removed, obtain a frequency domain signal of each path of subband signals by representing the path of subband signals as a sum of cyclic convolutions of input signals of related subbands and corresponding equivalent channel impulse responses and performing time-domain to frequency-domain conversion, and jointly process the frequency domain signals of all the subband signals to obtain inter-subband interference.

In particular, the signal y is received in the time domain of the kth sub-band_k(m) is an example, which can be expressed as the following expression (1):

$y_k\left(m\right)=c_{k,k}\left(m\right)\⊗x_k\left(m\right)+c_{k,k-1}\left(m\right)\⊗x_{k-1}\left(m\right)+c_{k,k+1}\left(m\right)\⊗x_{k+1}\left(m\right)+{\tilde{z}}_k\left(m\right),---\left(1\right)$

where m is 0,1, …, N-1(N denotes the length of the data block),which represents a cyclic convolution of the signal with the signal,is the noise after analysis of the filter bank and down-sampling, c_k,i(m) (i ═ k, k-1, k +1) is defined as the equivalent channel impulse response from the input subband i to the output subband k:

$c_{k,i}\left(m\right)={[f_i\left(n\right)*\tilde{h}\left(n\right)*h_k\left(n\right)]}_{\↓M}---\left(2\right)$

where, is the linear convolution, ↓, M is the down-sampling factor M, f_i(n) is a synthesis filter for the input subband i, h_k(n) is an analysis filter for the output subband k,is the transport channel defined above. Further, it should be noted that the length (i.e., Nc described above) of the front end information satisfying the setting is not less than c_k,i(m) length, y can be set_k(m) is expressed by the above expression (1).

Then, the interference removing unit 506 may further perform time-domain to frequency-domain conversion (e.g., fast fourier transform FFT) on the above expression (1), so that y_kThe frequency domain representation of (m) may be the following expression (2):

$Y_k\left(q\right)=H_{k,k}\left(q\right)X_k\left(q\right)+H_{k,k-1}\left(q\right)X_{k-1}\left(q\right)+H_{k,k+1}\left(q\right)X_{k+1}\left(q\right)+{\tilde{Z}}_k\left(q\right),---\left(2\right)$

wherein, Y_k(q),X_k(q),H_k,i(q) andrespectively represent y_k(m),x_k(m),c_k,i(m) andfrequency domain representation after N-point fourier transform.

It can be seen that after the above time-frequency conversion, although there is still interference in the frequency domain, the processing can be greatly simplified with respect to the time domain. Then, the frequency domain signals of all sub-bands are combined together for processing, and the following expression (3) can be obtained:

$\stackrel{\→}{Y}\left(q\right)=\stackrel{\→}{H}\left(q\right)\stackrel{\→}{X}\left(q\right)+\stackrel{\→}{Z}\left(q\right),---\left(3\right)$

wherein, $\stackrel{\→}{Y}\left(q\right)=\left[\begin{array}{c}{Y}_0\left(q\right)\\ .\\ .\\ .\\ Y_{M-1}\left(q\right)\end{array}\right],\stackrel{\→}{X}\left(q\right)=\left[\begin{array}{c}{X}_0\left(q\right)\\ .\\ .\\ .\\ X_{M-1}\left(q\right)\end{array}\right],\stackrel{\→}{Z}\left(q\right)=\left[\begin{array}{c}{Z}_0\left(q\right)\\ .\\ .\\ .\\ Z_{M-1}\left(q\right)\end{array}\right],$

thus, by a simple mathematical transformation one can obtain:

it can be seen that, by combining the frequency domain signals of all sub-bands according to the above processing, inter-sub-band interference can be eliminated, thereby facilitating the received signal detection at the receiving end. Furthermore, it should be understood that the above algorithm for removing inter-subband interference by using joint processing is only an example and not a limitation, and those skilled in the art may modify the above algorithm according to the principles of the present disclosure, for example, the time domain signal y of the kth subband may also be determined based on the front two adjacent subbands and the rear two adjacent subbands of the kth subband_k(m), and such modifications are naturally intended to fall within the scope of this disclosure.

Further, it should be noted that the joint processing performed by the above-described interference removal unit 506 may also be referred to as multi-subband equalization processing, which is necessary for a communication system including a filter bank adopting NRP design. Further, it should be noted that the equalization process is different from a time domain equalization process described later, which is multi-subband equalization performed mainly for the purpose of eliminating inter-subband interference.

Preferably, the apparatus 500 according to this embodiment may further include a signal recovery unit, and the signal recovery unit may be configured to perform frequency-domain-to-time-domain conversion and demodulation processing on the frequency-domain signal from which the inter-subband interference is removed, so as to recover an original input signal of the input signal at the transmitting end (i.e., the input bitstream b described above)_k(m))。

In particular, the signal recovery unit may be configured to frequency domain signalsPerforms frequency-domain to time-domain conversion (e.g., Inverse Discrete Fourier Transform (IDFT)) to obtain an input signal x_k(m) estimated valueAnd then subjected to demodulation processes such as hard decision and inverse mapping to recover the originally transmitted bit stream b_k(m)。

Fig. 6 is a block diagram showing another functional configuration example of an apparatus at a reception end in a wireless communication system according to an embodiment of the present disclosure.

As shown in fig. 6, the apparatus 600 at the receiving end according to this embodiment may include an equalization processing unit 602, a filter processing unit 604, a front-end information removal unit 606, and an interference removal unit 608. Among them, the functional configuration examples of the filter processing unit 604, the front-end information removing unit 606, and the interference removing unit 608 are the same as those of the corresponding units shown in fig. 5 above, and a description thereof will not be repeated. Only a functional configuration example of the equalization processing unit 602 will be described in detail below.

The equalization processing unit 602 may be configured to perform equalization processing on the input signal before being processed by the filter processing unit by using a time-domain equalizer, so that the only effect of the actual physical channel and the time-domain equalizer is the delay of the signal.

Specifically, as described above, in the embodiment of the present disclosure, when the front end information having the smallest length (for example, the minimum front end information length when the channel length is 1) is added at the transmitting end in order to reduce the bandwidth waste, if the channel length is too long at this time, the inter-symbol interference may be caused due to the insufficient length of the front end information. Therefore, in order to eliminate the interference, the receiving end may set a time domain equalizer t (n) before analyzing the filter bank so that the channel is divided into two partsThe only effect that is generated in conjunction with the time domain equalizer t (n) is the delay of the signal. Preferably, the channelThe equivalent channel impulse response after the joint action with the time-domain equalizer t (n) can be expressed as the following expression (3):

$\tilde{h}\left(n\right)*t\left(n\right)\≈\mathrm{\δ}(n-D),---\left(3\right)$

where D represents the delay in time. It is understood that the time-domain equalizer t (n) may be designed using any criterion, such as Zero Forcing (ZF) or Minimum Mean Square Error (MMSE), and the like, which is not limited by the present disclosure.

Fig. 7 is a block diagram showing another functional configuration example of an apparatus at a reception end in a wireless communication system according to another embodiment of the present disclosure.

As shown in fig. 7, the apparatus 700 at the receiving end according to this embodiment may include a filter parameter setting unit 702, a parameter notification unit 704, a filter processing unit 706, a front-end information removing unit 708, and an interference removing unit 710. Among them, the functional configuration examples of the filter processing unit 706, the front-end information removing unit 708, and the interference removing unit 710 are the same as those of the corresponding units shown in fig. 5 above, and a description thereof will not be repeated. Only functional configuration examples of the filter parameter setting unit 702 and the parameter notification unit 704 will be described in detail below.

The filter parameter setting unit 702 may be configured to set prototype filter parameters related to the design of prototype filters of the analysis filter bank and the synthesis filter bank according to a predetermined objective function, and the parameter notification unit 704 may be configured to notify the set prototype filter parameters to the transmitting end. Preferably, the prototype filter parameters may include one or more of a number of subbands, a filter length, a subband center frequency, and a bandwidth. Further, preferably, the prototype filter parameters may further include at least one of a transition band control factor, a pass band error to stop band error ratio, a pass band deviation, a stop band error, and an error tolerance.

It should be understood that the filter parameter setting unit 702 and the parameter notification unit 704 are optional, and the prototype filter parameters may be predetermined and known by both communication parties, in which case the filter parameter setting unit 702 and the parameter notification unit 704 need not be provided. Further alternatively, as described above, the relevant filter parameters may be set by the apparatus on the transmitting side.

As a preferred example, the filter parameter setting unit 702 may be further configured to set filter bank parameters related to the analysis filter bank and the synthesis filter bank for the transmitting end according to the prototype filter parameters, and the set parameters related to the synthesis filter bank are notified to the transmitting end by the parameter notification unit 704.

It should be noted that if the receiving end generates the parameters related to the synthesis filter set and notifies the parameters to the transmitting ends, in the case of uniform frequency division, the parameter notification unit 704 only needs to send one prototype filter to all transmitting ends at the same time, except that the subband center frequency needs to be notified to each transmitting end, so that different transmitting ends can obtain their own synthesis filters by frequency shifting, which can save signaling overhead. However, in the case of non-uniform division of the frequency band, the parameter notification unit 704 needs to directly transmit different parameters related to the synthesis filter bank to different sender devices.

Alternatively, the transmitting end itself may generate the corresponding synthesis filter bank parameters from the prototype filter parameters. In this case, the parameter notification unit 704 may be further configured to notify the transmitting end of a parameter optimization instruction to generate, by the transmitting end, appropriate parameters related to the synthesis filter bank based on a predetermined objective function according to the parameter optimization instruction and the prototype filter parameters.

Furthermore, preferably, the apparatus 700 according to this embodiment may further include a data block length setting unit.

The data block length setting unit may be configured to set a parameter related to the length of a data block in the input signal of each sub-band signal, and the parameter notification unit 704 may further notify the transmitting end of the parameter related to the length of the data block to add front end information according to the length of the data block by the transmitting end. Specifically, as described above, the transmitting end adds front-end information in the input signal every determined data block length (for example, N), and the length of the data block may preferably be equal to the number of points of the fast fourier transform and the inverse fast fourier transform employed in the processing thereafter.

It should be understood that the setting of the filter parameters may be triggered when the transmitting end needs to establish a data connection with the receiving end, for example, the transmitting end may send a data connection request to the receiving end before transmitting data, so that the filter parameter setting unit 702 may set the required prototype filter parameters in response to the data connection request. In addition, preferably, when the data transmission condition changes after the communication starts and the transmitting end sends a reconfiguration request, in order to ensure the data transmission performance, the prototype filter parameters and the like which are already set may also need to be reconfigured. For example, if a certain sub-band at the transmitting end needs to transmit a large amount of data in a burst, more bandwidth needs to be occupied, and at this time, parameters such as the bandwidth of the sub-band can be considered to be reconfigured. Therefore, the filter parameter setting unit 702 can also set the prototype filter parameters according to a predetermined data transmission condition. In this way, the entire wireless communication system may have better adaptability and flexibility, thereby greatly optimizing system performance.

Further, it is also understood that, in addition to the above-described parameters, the parameter notification unit 702 may also notify the transmitting end of information such as uplink channel slot allocation information, length of front end information (in case of setting the length of front end information by the receiving end), and the like, so that the transmitting end may perform corresponding configuration according to the received information to perform data transmission. However, in the case where such information is predetermined, the notification to the transmitting end is not necessary.

Preferably, as described above, before the data is formally transmitted, the transmitting end may first transmit a training sequence for channel estimation by the receiving end, so that the transmitting end may switch to an appropriate data transmission mode according to channel conditions. This example will be described in detail below with reference to fig. 8.

Fig. 8 is a block diagram showing another functional configuration example of an apparatus at a reception end in a wireless communication system according to an embodiment of the present disclosure.

As shown in fig. 8, the receiving apparatus 800 according to this embodiment may include a filter parameter setting unit 802, a parameter notification unit 804, a filter processing unit 806, a front end information removing unit 808, an interference removing unit 810, a channel estimation unit 812, and a mode notification unit 814. The functional configuration examples of the filter parameter setting unit 802, the parameter notifying unit 804, the filter processing unit 806, the front-end information removing unit 808, and the interference removing unit 810 are the same as those of the corresponding units shown in fig. 7 above, and a description thereof will not be repeated here. Only functional configuration examples of the channel estimation unit 812 and the mode notification unit 814 will be described in detail below.

The channel estimation unit 812 may be configured to estimate channel conditions according to a predetermined training sequence from the transmitting end to determine whether front-end information needs to be added when the transmitting end transmits a signal. The predetermined training sequence is added with front-end information by the transmitting end according to prototype filter parameters received from the receiving end and processed by the synthesis filter bank.

Specifically, as an example, the channel estimation unit 812 may calculate signal to interference and noise ratio (SINR) of each subband according to the received predetermined training sequence, and compare the minimum value of the SINR of all subbands with a predetermined threshold, where if the minimum value is greater than the predetermined threshold, it indicates that the channel quality is good, so that the transmitting end may not need to add front-end information when transmitting signals to obtain higher spectral efficiency. On the contrary, if the minimum value is equal to or less than the predetermined threshold, it indicates that the channel quality is poor, so that the transmitting end needs to add front-end information to ensure the performance of the receiving end when transmitting signals. It should be understood that the methods described herein with respect to channel estimation are merely examples, and those skilled in the art may also employ other methods known in the art for channel estimation. For example, the channel condition may be determined based on an average value of the Signal to interference and noise ratios of all subbands rather than a minimum value, or may be estimated based on parameters such as Reference Signal Receiving Power (RSRP), Reference Signal Receiving Quality (RSRQ), and Channel Quality Indicator (CQI).

Then, the mode notification unit 814 may be configured to notify the transmitting end of an indication of whether to employ the mode with or without front end information when transmitting a signal, according to the estimation result of the channel estimation unit 812.

It can be seen that, according to the embodiments of the present disclosure, a signaling mode (with or without front-end information mode) of a transmitting end can be flexibly switched according to a channel condition, so that system performance can be optimized.

Here, it should be noted that, when the transmitting end adopts the mode without front-end information, the signal of the receiving end cannot represent the sum of the above input signal of the related subband and the cyclic convolution of the corresponding equivalent channel impulse response, and thus cannot simplify the frequency domain representation thereof, and therefore, the above-described method of jointly processing the frequency domain signals of all subband signals at the receiving end to remove the inter-subband interference cannot be utilized, and a relatively complex receiving end design is required to perform signal detection.

According to the embodiment of the present disclosure, both the synthesis filter bank and the analysis filter bank adopt a non-complete reconstruction design, thereby realizing design flexibility. In addition, by adding front-end information when transmitting signals, a receiving end design with low complexity can be adopted, and system performance can be optimized.

It should be understood that although the functional configuration examples of the apparatus at the transmitting end and the apparatus at the receiving end in the wireless communication system are described above with reference to the drawings, this is only an example and not a limitation, and those skilled in the art may modify the above functional configuration examples according to the principles of the present disclosure, for example, add, delete, change, combine, sub-combine, and the like to the above functional blocks, and such modifications are naturally considered to fall within the scope of the present disclosure.

Corresponding to the above device embodiments, the present disclosure also provides the following method embodiments.

Fig. 9 is a flowchart illustrating a process example of a method of a transmitting end in a wireless communication system according to an embodiment of the present disclosure.

As shown in fig. 9, the method of the transmitting end according to the embodiment may include a front end information adding step S902, a filter processing step S904, and a signal transmitting step S906.

In the front-end information adding step S902, front-end information may be added to the input signal. Preferably, the front-end information may be a cyclic prefix. Specifically, in the front end information adding step S902, a cyclic prefix of length Nc may be added every data block length N according to the correlation parameter.

Next, in a filter processing step S904, the input signal to which the front-end information is added is subjected to filter processing with an integrated filter bank. Preferably, the synthesis filter bank employs a non-perfect reconstruction design. The specific design parameters of the synthesis filter bank may be predetermined, received from the receiving end, or generated by the transmitting end according to a predetermined objective function, which is not limited by the present disclosure.

Then, in the signal transmission step S906, the input signal after the filter processing is transmitted to the receiving side.

Fig. 10 is a flowchart illustrating a process example of a method of a receiving end in a wireless communication system according to an embodiment of the present disclosure.

As shown in fig. 10, the method of the receiving end according to this embodiment may include a filter processing step S1002, a front end information removing step S1004, and an interference removing step S1006.

In the filter processing step S1002, an input signal from the transmitting end is subjected to filter processing by an analysis filter bank to obtain a plurality of sub-band signals with front-end information. Preferably, the front-end information may be a cyclic prefix, and both the analysis filter bank and the synthesis filter bank may employ a non-perfect reconstruction design.

In the front end information removal step S1004, the front end information in the multi-path subband signal is removed.

Then, in the interference removal step S1006, the inter-subband interference is removed by combining the frequency domain signals of the plurality of subband signals from which the front-end information is removed and processing the combined signals. For the specific steps of the joint processing, reference may be made to the descriptions of the corresponding positions in the above embodiments of the apparatus, and further description is omitted here.

It should be noted that although the above describes a process example of a method in a wireless communication system according to an embodiment of the present disclosure, this is only an example and not a limitation, and a person skilled in the art may modify the above embodiment according to the principle of the present disclosure, for example, steps in various embodiments may be added, deleted, combined, or the like, and such modifications fall within the scope of the present disclosure.

In addition, it should be further noted that the method embodiments herein correspond to the apparatus embodiments described above, and therefore, the contents that are not described in detail in the method embodiments may refer to the descriptions of the corresponding positions in the apparatus embodiments, and the description is not repeated here.

Fig. 11 is a block diagram showing a configuration example of a wireless communication system according to an embodiment of the present disclosure.

As shown in fig. 11, a wireless communication system 1100 according to this embodiment may include a transmitting end device 1102 and a receiving end device 1104. Preferably, the transmitting end device 1102 may be a user equipment and the receiving end device 1104 may be a base station, as an example.

The transmitting-end device 1102 may include the apparatus of the transmitting end described above with reference to fig. 1 to 4, so that the transmitting-end device 1102 may add front-end information to an input signal, filter the input signal to which the front-end information is added with a synthesis filter bank, and transmit the filter-processed input signal to the receiving-end device 1104.

The receiving-end device 1104 may include the means of the receiving end described above with reference to fig. 5 to 8, so that the receiving-end device 1104 may perform filter processing on the input signal from the transmitting-end device 1102 with an analysis filter set to obtain a multi-channel sub-band signal with front-end information, remove the front-end information in the multi-channel sub-band signal, and perform processing by combining frequency domain signals of the multi-channel sub-band signal from which the front-end information is removed to remove inter-sub-band interference. Then, the receiving-end device 1104 can also restore the input signal at the transmitting-end device 1102 by performing frequency-domain-to-time-domain conversion, demodulation processing, and the like on the frequency-domain signal from which the interference has been removed.

Fig. 12 shows a signal processing flow in a wireless communication system according to an embodiment of the present disclosure.

As shown in fig. 12, at the transmitting end device, M-way bit stream b_k(M) (k is 0,1, …, M-1) is mapped into M complex stream symbols x_k(M), then inserting front end information with length Nc in each path of complex stream symbol every data block length N, and after adding front end information, all data blocks are processed by an integrated filter bank f with upsampling factor M_k(n) integrated into a single signal and sent to the channelAnd transmitting, wherein the channel is simultaneously interfered by a noise signal z (n). At the receiving end device, the received signal r (n) is subjected to an analysis filter bank h with a downsampling factor M_k(N) (k is 0,1, …, M-1) processing to obtain M subband complex symbol streams, dividing each subband complex symbol stream into data blocks of length (N + Nc), and removing front information of each data block to obtain data symbols y_k(m) of the reaction mixture. Then, by applying the data symbol y_k(m) converting to frequency domain signals (e.g., by FFT) and processing the frequency domain signals of all sub-bands jointly to remove inter-sub-band interference, and then converting the signals with the inter-sub-band interference removed to time domain signals (e.g., by IFFT) to obtain an input signal x_k(m) estimation, and then recovering the bit stream b inputted from the transmitting end through hard decision, reverse mapping, etc_k(m)。

It should be understood that the above signal processing flow is only an example and not a limitation. For example, when the transmitting side performs processing, the signal may be directly transmitted without being mapped, and when the receiving side performs processing, as described above, in order to avoid inter-symbol interference caused by insufficient front-end information length when the channel length is long, a time-domain equalizer may be provided before the analysis filter bank.

In combination with the above function configuration examples of the apparatus at the transmitting end and the apparatus at the receiving end, a signaling interaction flow between the transmitting end device and the receiving end device will be described below.

Fig. 13 is a flow diagram illustrating an example of signaling interactions in a wireless communication system in accordance with an embodiment of the present disclosure.

In the example shown in fig. 13, the communication mode is Time Division Duplex (TDD), and the synthesis filter bank parameters are generated by the receiving end device (e.g., base station).

As shown in fig. 13, first, in step S1, the sending-end device (e.g., user equipment) issues a data connection request to the receiving-end device. Then, in step S2, the receiving-side device, after receiving the data connection request, transmits a response request if it is determined that the current condition allows communication.

Next, in step S3, the receiving end device determines the frequency resource available in the TDD mode as a physical shared channel, allocates different time slots of the channel to be used for uplink and downlink data transmission, allocates a certain bandwidth to each transmitting end device according to the requirement of the transmitting end, sets a prototype filter, and generates a comprehensive filter bank and an analysis filter bank. It should be understood that, in the case that the uplink channel timeslot is pre-allocated, the receiving end device may not need to allocate and send corresponding allocation information to the sending end device.

Next, in step S4, the receiving-end device transmits uplink channel slot allocation information and the generated prototype filter and synthesis filter bank parameters to the transmitting-end device. Optionally, the receiving end device may further send the data block length N and the length Nc of the front end information to the sending end device. It should be understood that, as described above, the data block length N and the length Nc of the front-end information may also be determined by the transmitting-end device itself according to the received prototype filter parameters and the like, without being received from the receiving-end device.

Then, in step S5, the transmitting-side apparatus transmits a predetermined training sequence to the receiving-side apparatus. In step S6, the receiving end device performs channel estimation according to the received training sequence, and sends a corresponding data transmission instruction (including an indication of whether the transmitting end employs the mode with or without front end information) to the transmitting end device according to the channel estimation condition in step S7.

Next, in step S8, the transmitting-end device performs uplink data transmission in the allocated time slot according to the received data transmission command. In the case that the transmitting-side device adopts the mode with the front-end information, the receiving-side device may process the received data by using the method of the receiving-side (i.e., the method of removing the inter-subband interference through the joint processing) in step S9, and transmit the corresponding downlink data as required in step S10. On the other hand, in the case that the transmitting-end device adopts the front-end information free mode, the receiving-end device may adopt other corresponding methods to process the received data in step S9.

For clarity, a description of the specific signaling and associated channels involved in the signaling interaction described above is given below by way of table 2.

TABLE 2

Signaling	Physical channel passing through	Direction of rotation
			Data connection request	PUCCH	Transmitting end → receiving end
Data connection acknowledgement	PDCCH	Receiving end → transmitting end
			Transmitting uplink channel slot information	PDCCH	Receiving end → transmitting end
Transmitting optimized filter bank parameters	PDCCH	Receiving end → transmitting end
			Training sequence	PUSCH	Transmitting end → receiving end
Data transfer instruction	PDCCH	Receiving end → transmitting end
			Uplink data transmission	PUSCH	Transmitting end → receiving end
Downlink data transmission	PDSCH	Receiving end → transmitting end

Wherein, pusch (physical Uplink Shared channel) represents a physical Uplink Shared channel, pucch (physical Uplink Control channel) represents a physical Uplink Control channel, pdsch (physical Downlink Shared channel) represents a physical Downlink Shared channel, and pdcch (physical Downlink Control channel) represents a physical Downlink Control channel.

Fig. 14 is a flow diagram illustrating another example of signaling interactions in a wireless communication system according to an embodiment of the disclosure.

The signaling interaction flow shown in fig. 14 is substantially the same as the signaling interaction flow shown in fig. 13, except that, in the example shown in fig. 14, the relevant parameters of the synthesis filter bank are generated by the transmitting end device (e.g., user equipment) in the steps shown by the dashed boxes. At this time, the receiving end device may not send the generated parameters related to the integrated filter bank to the sending end device, but only send the prototype filter parameters and the parameter optimization instruction to the sending end device, so that the sending end device may generate the parameters related to the integrated filter bank based on the predetermined objective function according to the received prototype filter parameters and the parameter optimization instruction. The processing in the other steps is substantially the same as the example shown in fig. 13, and the details thereof will not be described repeatedly.

Fig. 15 is a flow diagram illustrating another example of signaling interactions in a wireless communication system according to an embodiment of the present disclosure.

The signaling interaction flow shown in fig. 15 is basically the same as the signaling interaction flow shown in fig. 13, except that in the example shown in fig. 15, the communication mode is Frequency Division Duplex (FDD), that is, uplink and downlink communications of the transmitting end device and the receiving end device are on two separate frequency channels. At this time, in step S3, the receiving end device (e.g., a base station) determines that two channels with different frequencies in the FDD mode are respectively used as a physical uplink shared channel and a physical downlink shared channel, and allocates a certain bandwidth to each transmitting end device according to the requirement of the transmitting end device, sets a prototype filter, and then generates a synthesis filter bank and an analysis filter bank. It should be understood that, as described above, in the case where the channel and the bandwidth are allocated in advance, the receiving-end device may not need to perform the allocation operation, and may not need to transmit the allocation information to the transmitting-end device. The processing in the other steps is substantially the same as the example shown in fig. 13, and the details thereof will not be described repeatedly.

Fig. 16 is a flow diagram illustrating another example of signaling interactions in a wireless communication system according to an embodiment of the present disclosure.

The signaling interaction flow shown in fig. 16 is substantially the same as the signaling interaction flow shown in fig. 15, except that, in the example shown in fig. 16, the relevant parameters of the synthesis filter bank are generated by the transmitting end device (e.g., user equipment) in the steps shown by the dashed boxes. At this time, the receiving end device may not send the generated parameters related to the integrated filter bank to the sending end device, but only send the prototype filter parameters and the parameter optimization instruction to the sending end device, so that the sending end device may generate the parameters related to the integrated filter bank based on the predetermined objective function according to the received prototype filter parameters and the parameter optimization instruction. The processing in the other steps is substantially the same as the example shown in fig. 15, and the details thereof will not be repeated here.

It should be understood that although the signaling interaction flow in the wireless communication system according to the embodiment of the present disclosure is described above with reference to fig. 13 to 16, this is only an example and not a limitation, and those skilled in the art may make appropriate modifications to the above signaling interaction flow according to the principles of the present disclosure, and such modifications should of course be considered to fall within the scope of the present disclosure.

Furthermore, according to an embodiment of the present disclosure, there is also provided an electronic device, which may include one or more processors, and the processors may be configured to perform the functions of the method or the corresponding units in the wireless communication system according to the embodiment of the present disclosure described above.

It should be understood that the machine-executable instructions in the storage media and program products according to the embodiments of the present disclosure may also be configured to perform methods corresponding to the above-described apparatus embodiments, and thus, contents not described in detail herein may refer to the description of the previous corresponding locations, and the description will not be repeated herein.

Accordingly, storage media for carrying the above-described program products comprising machine-executable instructions are also included in the present disclosure. Including, but not limited to, floppy disks, optical disks, magneto-optical disks, memory cards, memory sticks, and the like.

Further, it should be noted that the above series of processes and means may also be implemented by software and/or firmware. In the case of implementation by software and/or firmware, a program constituting the software is installed from a storage medium or a network to a computer having a dedicated hardware structure, such as a general-purpose personal computer 1700 shown in fig. 17, which is capable of executing various functions and the like when various programs are installed.

In fig. 17, a Central Processing Unit (CPU)1701 executes various processes in accordance with a program stored in a Read Only Memory (ROM)1702 or a program loaded from a storage portion 1708 to a Random Access Memory (RAM) 1703. The RAM 1703 also stores data necessary when the CPU 1701 executes various processes and the like as necessary.

The CPU 1701, ROM 1702, and RAM 1703 are connected to each other via a bus 1704. An input/output interface 1705 is also connected to the bus 1704.

The following components are connected to the input/output interface 1705: an input section 1706 including a keyboard, a mouse, and the like; an output portion 1707 including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker and the like; a storage portion 1708 including a hard disk and the like; and a communication section 1709 including a network interface card such as a LAN card, a modem, or the like. The communication section 1709 performs communication processing via a network such as the internet.

A driver 1710 is also connected to the input/output interface 1705 as necessary. A removable medium 1711 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 1710 as necessary, so that a computer program read out therefrom is installed in the storage portion 1708 as necessary.

In the case where the above-described series of processes is realized by software, a program constituting the software is installed from a network such as the internet or a storage medium such as the removable medium 1711.

It should be understood by those skilled in the art that such a storage medium is not limited to the removable medium 1711 shown in fig. 17 in which the program is stored, distributed separately from the apparatus to provide the program to the user. Examples of the removable medium 1711 include a magnetic disk (including a floppy disk (registered trademark)), an optical disk (including a compact disc read only memory (CD-ROM) and a Digital Versatile Disc (DVD)), a magneto-optical disk (including a Mini Disk (MD) (registered trademark)), and a semiconductor memory. Alternatively, the storage medium may be the ROM 1702, a hard disk included in the storage portion 1708, or the like, in which programs are stored and which are distributed to users together with the device including them.

Next, an application example relating to the technique of the present disclosure will be described with reference to fig. 18A to 22B.

Fig. 18A and 18B show a spectral diagram of an integrated filter bank and a corresponding system bit error rate graph, respectively, in a first example scenario in which the techniques of the present disclosure are applied.

In this first exemplary scenario, a uniform filter bank design is employed and testing is performed under an Additive White Gaussian Noise (AWGN) channel, and the entire system block diagram can be seen in fig. 12. The comprehensive filter bank and the analysis filter bank are designed by adopting a uniform filter bank, and the design method specifically comprises the following steps:

$f_k\left(n\right)=\sqrt{M}{h}_p\left(n\right)\exp \left[j\frac{2\mathrm{\π}}{M}(k+\frac{1}{2})(n+\frac{M+2}{4})\right],n=\mathrm{0,1},...,N_f-1,k=\mathrm{0,1},...,M-1,$

$h_k\left(n\right)=\sqrt{M}{h}_p\left(n\right)\exp [-j\frac{2\mathrm{\π}}{M}(k+\frac{1}{2})(N-n+\frac{M+2}{4})],n=1,2,...,N_f,k=\mathrm{0,1},...,M-1.$

wherein h is_p(N) is a prototype filter of length N_fThe product has the parameter of [ 0.00070.00080.0002-0.0016-0.0049-0.0091-0.0128-0.0138-0.00960.00200.02200.04920.08050.11110.13550.14910.14910.13550.11110.08050.04920.02200.0020-0.0096-0.0138-0.0128-0.0091-0.0049-0.00160.00020.00080.0007 ═ 32]The number of sub-bands is M-8, each signal stream is divided into sub-blocks with the length of N-256, the length of front end information is Nc-8/32 × 2-1, the input signal is not coded, the channel adopts AWGN channel, and time domain equalizer is not needed, i.e. t (N) -1.

Fig. 18A shows a spectral diagram of a uniformly designed synthesis filter bank in a first exemplary scenario, and fig. 18B shows a plot of the corresponding bit error rate of the system. As can be seen from these figures, the system has good performance.

Fig. 19A and 19B show a spectral diagram of an integrated filter bank and a corresponding system bit error rate graph, respectively, in a second example scenario in which the techniques of this disclosure are applied.

In this second exemplary scenario, a uniform filter bank design is adopted, and the test is performed under a rayleigh fading channel with 6 taps, and the whole system block diagram is shown in fig. 12. The comprehensive filter bank and the analysis filter bank are designed by adopting a uniform filter bank, and the design method specifically comprises the following steps:

$f_k\left(n\right)=\sqrt{M}{h}_p\left(n\right)\exp \left[j\frac{2\mathrm{\π}}{M}(k+\frac{1}{2})(n+\frac{M+2}{4})\right],n=\mathrm{0,1},...,N_f-1,k=\mathrm{0,1},...,M-1,$

$h_k\left(n\right)=\sqrt{M}{h}_p\left(n\right)\exp [-j\frac{2\mathrm{\π}}{M}(k+\frac{1}{2})(N-n+\frac{M+2}{4})],n=1,2,...,N_f,k=\mathrm{0,1},...,M-1.$

wherein h is_p(N) is a prototype filter of length N_fThe product has the parameter of [ 0.00070.00080.0002-0.0016-0.0049-0.0091-0.0128-0.0138-0.00960.00200.02200.04920.08050.11110.13550.14910.14910.13550.11110.08050.04920.02200.0020-0.0096-0.0138-0.0128-0.0091-0.0049-0.00160.00020.00080.0007 ═ 32]The number of sub-bands is M-8, each signal stream is divided into sub-blocks with the length of N-256, the length of front end information is Nc (32 × 2-1)/8-8, the input signal is not coded, the channel is a Rayleigh fading channel with 6 taps, and the coefficient is $\tilde{h}\left(n\right)=\left[\begin{array}{cc}0.6919-0.0054i& 0.3558+0.1631i\end{array}\right.$ $\begin{array}{cccc}-0.0259+0.1697i& 0.5945+0.2379i& -0.0555-0.1483i& 0.4030-\end{array}$ $0.2220i].$ Time-domain equalizer t used in this case (n) [ -0.0890-0.0214 i-0.0563-0.0906 i-0.1327 +0.0903i 0.2468+0.1741 i-0.0631 +0.1258i 0.3847-0.2417 i-0.2752-0.2747 i 0.1264+0.0293i 0.4158+0.0654i]。

Fig. 19A shows a spectral diagram of a uniformly designed synthesis filter bank in a second exemplary scenario, and fig. 19B shows a plot of the corresponding bit error rate of the system. It can be seen from these figures that the system still has good performance.

Fig. 20A and 20B show a spectral diagram of an integrated filter bank and a corresponding system bit error rate graph, respectively, in a third example scenario in which the techniques of this disclosure are applied.

In a third exemplary scenario, a non-uniform filter bank design is adopted, and the test is performed under a rayleigh fading channel with 6 taps, and the whole system block diagram is shown in fig. 12. The comprehensive filter bank and the analysis filter bank are designed by adopting a non-uniform filter bank, and the method specifically comprises the following steps:

$f_k\left(n\right)=\sqrt{M}{h}_{p1}\left(n\right)\exp \left[j\frac{2\mathrm{\π}}{M}(k+\frac{1}{2})(n+\frac{M+2}{4})\right],n=\mathrm{0,1},...,N_f-1,k=\mathrm{0,2},4,...,M-2,$

$f_k\left(n\right)=\sqrt{M}{h}_{p2}\left(n\right)\exp \left[j\frac{2\mathrm{\π}}{M}(k+\frac{1}{2})(n+\frac{M+2}{4})\right],n=\mathrm{0,1},...,N_f-1,k=\mathrm{1,3},5,...,M-1,$

$h_k\left(n\right)=\sqrt{M}{h}_{p1}\left(n\right)\exp [-j\frac{2\mathrm{\π}}{M}(k+\frac{1}{2})(N-n+\frac{M+2}{4})],n=\mathrm{1,2},...,N_f,k=\mathrm{0,2},4,...,M-2.$

$h_k\left(n\right)=\sqrt{M}{h}_{p2}\left(n\right)\exp [-j\frac{2\mathrm{\π}}{M}(k+\frac{1}{2})(N-n+\frac{M+2}{4})],n=\mathrm{1,2},...,N_f,k=\mathrm{1,3},5,...,M-1.$

wherein h is_p1(n) and h_p2(N) is a prototype filter of length N_f＝32，h_p1(n) the parameters are [ 0.00070.00080.0002-0.0016-0.0049-0.0091-0.0128-0.0138-0.00960.00200.02200.04920.08050.11110.13550.14910.14910.13550.11110.08050.04920.02200.0020-0.0096-0.0138-0.0128-0.0091-0.0049-0.00160.00020.00080.0007]，h_p2(n) has a parameter of [ -0.00000.00000.00020.00070.00190.00410.00780.01330.02110.03090.04250.05500.06740.07820.08630.09070.09070.08630.07820.06740.05500.04250.03090.02110.01330.00780.00410.00190.00070.00020.0000-0.0000]The number of sub-carriers is M-8, each signal stream is divided into sub-blocks with the length of N-256, the length of front-end information is Nc-8/32 × 2-1, and the output isThe incoming signal is not encoded; the channel adopts a Rayleigh fading channel with 6 taps and the coefficient is $\tilde{h}\left(n\right)=\left[\begin{array}{ccc}0.5923+0.2892i& -0.5460+0.0801i& -0.2827-0.3552i0.1700+\end{array}\right.$ $\left.\begin{array}{ccc}0.1137i& 0.1574-0.0070i& 0.4136-0.2606i\end{array}\right].$ Time-domain equalizer t used in this case (n) ([ 0.0433+0.1833i 0.2488+0.1802i 0.1907+0.2378i 0.5011+0.2900i 0.3946+0.0228i 0.2334+0.0589 i-0.0415 +0.0739i-0.2863+0.0656i 0.3547-0.1087i]。

Fig. 20A shows a spectrum diagram of a non-uniformly designed synthesis filter bank in a third exemplary scenario, and fig. 20B shows a plot of the corresponding bit error rate of the system. As can be seen from these figures, the system still has good performance under the non-uniform spectrum partitioning condition.

Fig. 21A and 21B show a spectral diagram of an integrated filter bank and a corresponding system bit error rate graph, respectively, in a fourth example scenario in which the techniques of this disclosure are applied.

In this fourth exemplary scenario, a uniform filter bank design is adopted, and the test is performed under a rayleigh fading channel with 16 taps, and the whole system block diagram is shown in fig. 12. The comprehensive filter bank and the analysis filter bank are designed by adopting a uniform filter bank, and the design method specifically comprises the following steps:

$f_k\left(n\right)=\sqrt{M}{h}_p\left(n\right)\exp \left[j\frac{2\mathrm{\π}}{M}(k+\frac{1}{2})(n+\frac{M+2}{4})\right],n=\mathrm{0,1},...,N_f-1,k=\mathrm{0,1},...,M-1,$

$h_k\left(n\right)=\sqrt{M}{h}_p\left(n\right)\exp [-j\frac{2\mathrm{\π}}{M}(k+\frac{1}{2})(N-n+\frac{M+2}{4})],n=1,2,...,N_f,k=\mathrm{0,1},...,M-1.$

wherein h is_p(N) is a prototype filter of length N_fThe product has the parameter of [ 0.00070.00080.0002-0.0016-0.0049-0.0091-0.0128-0.0138-0.00960.00200.02200.04920.08050.11110.13550.14910.14910.13550.11110.08050.04920.02200.0020-0.0096-0.0138-0.0128-0.0091-0.0049-0.00160.00020.00080.0007 ═ 32]The number of sub-bands is M-8, each signal stream is divided into sub-blocks with the length of N-256, the length of front end information is Nc (32 × 2-1)/8-8, the input signal is not coded, the channel is a 16-tap Rayleigh fading channel, and the coefficient is $\tilde{h}\left(n\right)=\left[\begin{array}{cc}0.0694+0.3493i& 0.0550-0.0567i\end{array}\right.$ $\begin{array}{cccc}0.0484+0.0816i& -0.1834+0.2230i& 0.0938-0.1215i& -0.3086-0.1175i\\ -0.2214+0.0838i& 0.0421-0.1953i& 0.0283+0.0869i& 0.1096+0.3599i\\ -0.2261-0.1244i& 0.0556-0.4401i& -0.0258-0.0755i& 0.2929-0.0697i\end{array}$ $\left.\begin{array}{cc}0.2602+0.1853i& -0.0209-0.2980i\end{array}\right].$ Time-domain equalizer t (n) under the condition of [ -0.0338+0.1121 i-0.1051 +0.0065i 0.0047+0.1736 i-0.0015 +0.0540i-0.1048+0.0639i 0.0734+0.0675i 0.0563+0.2755i 0.2580+0.0412i 0.2260-0.0100 i-0.0077 +0.1079i 0.2362+0.3025i-0.1692+0.1057i 0.3258-0.2504 i-0.0146-0.2281 i-0.0105 +0.1992i-0.1643-0.2990 i-0.1833 +0.1997i 0.1112+0.0970 i-0.1986-0.0512 i0.1784-0.0377i 0.0219-0.0483i 0.0224-0.1067 i-0.0325-0.1040 i-0.0010+0.0748i]。

Fig. 21A shows a spectral diagram of a uniformly designed synthesis filter bank in a fourth exemplary scenario, and fig. 21B shows a plot of the corresponding bit error rate of the system. As can be seen from these figures, the system has good performance.

Fig. 22A and 22B show a spectral diagram of an integrated filter bank and a corresponding system bit error rate graph, respectively, in a fifth example scenario in which the techniques of this disclosure are applied.

In a fifth exemplary scenario, a non-uniform filter bank design is adopted, and a test is performed under a rayleigh fading channel with 16 taps, and the whole system block diagram is shown in fig. 12. The comprehensive filter bank and the analysis filter bank are designed by adopting a non-uniform filter bank, and the method specifically comprises the following steps:

$f_k\left(n\right)=\sqrt{M}{h}_{p1}\left(n\right)\exp \left[j\frac{2\mathrm{\π}}{M}(k+\frac{1}{2})(n+\frac{M+2}{4})\right],n=\mathrm{0,1},...,N_f-1,k=\mathrm{0,2},4,...,M-2,$

$f_k\left(n\right)=\sqrt{M}{h}_{p2}\left(n\right)\exp \left[j\frac{2\mathrm{\π}}{M}(k+\frac{1}{2})(n+\frac{M+2}{4})\right],n=\mathrm{0,1},...,N_f-1,k=\mathrm{1,3},5,...,M-1,$

$h_k\left(n\right)=\sqrt{M}{h}_{p1}\left(n\right)\exp [-j\frac{2\mathrm{\π}}{M}(k+\frac{1}{2})(N-n+\frac{M+2}{4})],n=\mathrm{1,2},...,N_f,k=\mathrm{0,2},4,...,M-2.$

$h_k\left(n\right)=\sqrt{M}{h}_{p2}\left(n\right)\exp [-j\frac{2\mathrm{\π}}{M}(k+\frac{1}{2})(N-n+\frac{M+2}{4})],n=\mathrm{1,2},...,N_f,k=\mathrm{1,3},5,...,M-1.$

wherein h is_p1(n) and h_p2(N) is a prototype filter of length N_f＝32，h_p1(n) has a parameter of [ 0.00070.0008 0.0002 -0.0016 -0.0049 -0.0091 -0.0128 -0.0138 -0.00960.0020 0.0220 0.0492 0.0805 0.1111 0.1355 0.1491 0.1491 0.1355 0.11110.0805 0.0492 0.0220 0.0020 -0.0096 -0.0138 -0.0128 -0.0091 -0.0049-0.0016 0.0002 0.0008 0.0007]，h_p2(n) has a parameter of [ -0.00000.00000.00020.00070.00190.00410.00780.01330.02110.03090.04250.05500.06740.07820.08630.09070.09070.08630.07820.06740.05500.04250.03090.02110.01330.00780.00410.00190.00070.00020.0000-0.0000]The number of sub-carriers is 8, each signal stream is divided into sub-blocks with the length of N256, the length of front end information is Nc (32 × 2-1)/8 is 8, the input signal is not coded, the channel adopts a 16-tap Rayleigh fading channel, and the coefficient is $\tilde{h}\left(n\right)=\left[\begin{array}{ccc}0.1548+0.1254i& 0.3936+0.0495i& -0.3440-0.2594i\end{array}\right.$ $\begin{array}{cccc}-0.2315-0.1222i& 0.2308-0.1534i& 0.1739-0.0906i& -0.2212-0.1383i\\ -0.0318+0.0753i& -0.1314+0.1788i& 0.0412-0.0443i& 0.3715+0.0980i\\ -0.1550+0.1342i& 0.3445+0.0237i& -0.0822-0.0482i& -0.1152-0.0959i\end{array}$ $0.1078-0.2056i].$ In this case, time-domain equalizer t (n) is (0.1210-0.0471 i-0.1050-0.0056 i 0.0664+0.0275i 0.0879-0.0530 i-0.1337-0.0563 i-0.0193 +0.0681i 0.1051+0.0899 i-0.0792-0.0883 i-0.1010 +0.2287i 0.4666-0.0118 i-0.2458-0.1265 i 0.2638+0.0050 i-0.0250 +0.0775 i-0.0876-0.1859 i-0.1267 +0.0065 i-0.1352 +0.2436 i-0.0292 +0.1071i0.1981+0.0508 i-0.1362 +0.0859 i-0.3466 +0.1850 i-0.2480-0.0219 i0.0616-0.0298 i-0.0847 + 0.0704 i-0.0704 +0.0243 i-0.0704 i +0.]。

Fig. 22A shows a spectrum diagram of a non-uniformly designed synthesis filter bank in a fifth exemplary scenario, and fig. 22B shows a plot of the corresponding bit error rate of the system. As can be seen from these figures, the system still has good performance under the non-uniform spectrum partitioning.

It should be understood that although superior performance is achieved in a wireless communication system to which the techniques of the present disclosure are applied as described above in connection with the first through fifth example scenarios, this is merely an example and not a limitation, and the techniques of the present disclosure may be applied in other scenarios, e.g., employing filter lengths, channels, etc., that differ from the example scenarios described above.

The preferred embodiments of the present disclosure are described above with reference to the drawings, but the present disclosure is of course not limited to the above examples. Various changes and modifications within the scope of the appended claims may be made by those skilled in the art, and it should be understood that these changes and modifications naturally will fall within the technical scope of the present disclosure.

For example, a plurality of functions included in one unit may be implemented by separate devices in the above embodiments. Alternatively, a plurality of functions implemented by a plurality of units in the above embodiments may be implemented by separate devices, respectively. In addition, one of the above functions may be implemented by a plurality of units. Needless to say, such a configuration is included in the technical scope of the present disclosure.

In this specification, the steps described in the flowcharts include not only the processing performed in time series in the described order but also the processing performed in parallel or individually without necessarily being performed in time series. Further, even in the steps processed in time series, needless to say, the order can be changed as appropriate.

Claims (30)

1. An apparatus at a receiving end in a wireless communication system, comprising:

a filter processing unit configured to filter an input signal from a transmitting end with an analysis filter bank to obtain a plurality of sub-band signals with front-end information;

a front-end information removing unit configured to remove front-end information in the multi-path sub-band signal; and

and an interference removing unit configured to remove inter-subband interference by combining the frequency domain signals of the plurality of paths of subband signals from which the front-end information is removed and processing the combined signals.

2. The apparatus of claim 1, further comprising:

and the signal recovery unit is configured to perform frequency-domain-to-time-domain conversion and demodulation processing on the frequency-domain signal from which the inter-subband interference is removed so as to recover an original input signal of the input signal at the transmitting end.

3. The apparatus of claim 1, wherein the interference removing unit is further configured to, for each path of subband signals from which front-end information is removed, determine the path of subband signals according to the input signals of relevant subbands and equivalent channel impulse responses of the input subbands of the relevant subbands with respect to the path of subband signals, perform time-domain to frequency-domain conversion to obtain frequency-domain signals of each path of subband signals, and jointly process the frequency-domain signals of all subband signals to remove the inter-subband interference.

4. The apparatus of claim 3, wherein for each path of subband signals from which front-end information is removed, the related subband comprises the path of subband itself and adjacent subbands of the path of subband.

5. The apparatus according to claim 3 or 4, wherein the interference removing unit is further configured to, for each path of subband signals from which front-end information is removed, represent the path of subband signals as a sum of cyclic convolutions of input signals of the relevant subbands and corresponding equivalent channel impulse responses, perform time-domain to frequency-domain conversion to obtain frequency-domain signals of each path of subband signals, and jointly process the frequency-domain signals of all the subband signals to remove the inter-subband interference.

6. The apparatus of claim 1, further comprising:

and the equalization processing unit is configured to perform equalization processing on the input signal before the processing of the filter processing unit by using a time domain equalizer, so that the influence of the joint of the actual physical channel and the time domain equalizer is only the delay of the signal.

7. The apparatus of claim 1, further comprising:

a filter parameter setting unit configured to set prototype filter parameters related to design of prototype filters of the analysis filter bank and the synthesis filter bank according to a predetermined objective function; and

a parameter notification unit configured to notify the transmission end of the prototype filter parameters,

wherein the prototype filter parameters include one or more of a number of subbands, a filter length, a subband center frequency, and a bandwidth.

8. The apparatus of claim 7, wherein the prototype filter parameters further comprise at least one of a transition band control factor, a pass band error to stop band error ratio, a pass band offset, a stop band error, and an error tolerance.

9. The apparatus of claim 7 or 8, further comprising:

a data block length setting unit configured to set a parameter related to a length of a data block in an input signal of each path of the subband signal,

the parameter notification unit further notifies the sending end of a parameter related to the length of the data block, so that the sending end adds the front-end information according to the length of the data block.

10. The apparatus of claim 9, wherein the length of the data block is equal to a number of points of a fast fourier transform employed by the interference removal unit.

11. The apparatus according to claim 7 or 8, wherein the filter parameter setting unit is further configured to set the prototype filter parameter in response to a data connection request from the transmitting end or according to a predetermined data transmission condition.

12. The apparatus according to claim 7 or 8, wherein the filter parameter setting unit is further configured to set filter bank parameters related to the synthesis filter bank and the analysis filter bank according to the prototype filter parameters.

13. The apparatus of claim 12, wherein the parameter notification unit is further configured to notify the transmitting end of filter bank parameters related to the synthesis filter bank.

14. The apparatus according to claim 7 or 8, wherein the parameter notification unit is further configured to notify the transmitting end of a parameter optimization instruction to generate, by the transmitting end, parameters related to the synthesis filter bank based on a predetermined objective function according to the parameter optimization instruction and the prototype filter parameters.

15. The apparatus of claim 7, further comprising:

a channel estimation unit configured to estimate a channel condition according to a predetermined training sequence from the transmitting end to determine whether front-end information needs to be added when the transmitting end transmits a signal, wherein the predetermined training sequence is processed by the transmitting end by adding the front-end information according to the received prototype filter parameters and by an integrated filter bank; and

a mode notification unit configured to notify the transmitting end of an indication whether to adopt a front-end information mode or a front-end information-free mode when transmitting a signal, according to an estimation result of the channel estimation unit.

16. The apparatus of claim 1, wherein the analysis filter bank employs a non-perfect reconstruction design.

17. The apparatus of claim 1, wherein the front-end information is a cyclic prefix.

18. An apparatus of a transmitting end in a wireless communication system, comprising:

a front-end information adding unit configured to add front-end information to an input signal;

a filter processing unit configured to filter-process the input signal to which the front-end information is added, with a synthesis filter bank; and

and a signal transmitting unit configured to transmit the input signal processed by the filter to a receiving end.

19. The apparatus of claim 18, further comprising:

a parameter receiving unit configured to receive prototype filter parameters related to design of prototype filters of the synthesis filter bank from the receiving end,

wherein the filter processing unit is further configured to perform filter processing with the synthesis filter bank in accordance with the received prototype filter parameters, and

wherein the prototype filter parameters include one or more of a number of subbands, a filter length, a subband center frequency, and a bandwidth.

20. The apparatus of claim 19, wherein the parameter receiving unit is further configured to receive filter bank parameters related to the synthesis filter bank from the receiving end.

21. The apparatus of claim 19, further comprising:

a filter bank parameter generating unit configured to generate parameters related to the integrated filter bank based on a predetermined objective function according to the received prototype filter parameters and a parameter optimization instruction from the receiving end.

22. The apparatus of claim 19, further comprising:

a front-end information length determination unit configured to determine a length of the front-end information based on the prototype filter parameter,

wherein the front end information adding unit is further configured to add the front end information according to a length of the front end information.

23. The apparatus of claim 22, wherein the length of the front end information is a minimum value of the front end information required when a channel length is 1.

24. The apparatus of claim 19, wherein the parameter receiving unit is further configured to receive a parameter related to a length of a data block in the input signal from the receiving end, and the front end information adding unit is further configured to add the front end information according to the parameter related to the length of the data block.

25. The apparatus of claim 19, wherein the input signal is a predetermined training sequence,

and wherein the apparatus further comprises: a mode receiving unit configured to receive, from the receiving end, an indication whether the transmitting end employs a front end information mode or a front end information-less mode when transmitting a signal, the indication being determined by the receiving end based on a channel condition estimated from the predetermined training sequence.

26. The apparatus of claim 18, wherein the synthesis filter bank employs a non-perfect reconstruction design.

27. The apparatus of claim 18, wherein the front-end information is a cyclic prefix.

28. A wireless communication system, comprising:

a transmitting end device configured to add front end information to an input signal, filter-process the input signal to which the front end information is added with a synthesis filter bank, and transmit the input signal processed by the filter to a receiving end device; and

a receiving end device configured to perform filter processing on an input signal from the transmitting end device by using an analysis filter set to obtain a plurality of sub-band signals with front end information, remove the front end information in the plurality of sub-band signals, and perform processing to remove inter-sub-band interference by combining the frequency domain signals of the plurality of sub-band signals from which the front end information is removed.

29. A method at a receiving end in a wireless communication system, comprising:

a filter processing step for performing filter processing on an input signal from a transmitting end by using an analysis filter bank to obtain a multi-path sub-band signal with front-end information;

a front-end information removing step, which is used for removing the front-end information in the multi-path sub-band signals; and

and an interference removing step, which is used for removing the inter-subband interference by combining the frequency domain signals of the multi-channel subband signals after the front-end information is removed and processing the signals.

30. A method at a transmitting end in a wireless communication system, comprising:

a front-end information adding step of adding front-end information to the input signal;

a filter processing step of performing filter processing on the input signal to which the front-end information is added, with a synthesis filter bank; and

and a signal transmitting step for transmitting the input signal processed by the filter to a receiving end.