Novel generalized multi-stream space shift keying method and system

Abstract

The invention provides a novel generalized multi-stream space shift keying method and system. The method comprises the following steps: selecting a modulation symbol for each stream of data in multi-stream data; respectively carrying out GSSK modulation on each stream of data, and determining an activation sequence number by using an antenna index combination; according to the modulation symbol corresponding to each stream of data, determining an emission vector of the stream of data; superposing the emission vectors of each stream of data to obtain a total emission signal; and distributing the total transmission signal to the antennas for transmission in a mapping manner, and distributing the composite signal to the activated antennas according to the antenna index combination. The system comprises a serial-parallel conversion unit, a GSSK modulation unit, a signal synthesis unit, a constellation mapping unit and a transmitting antenna unit. According to the method, generalized space shift keying modulation is performed on each stream of data, the antenna combination utilization number is increased, and the spectrum utilization efficiency is effectively improved compared with a traditional algorithm; meanwhile, the number of the transmitting antennas is not limited by the power of 2, and the utilization rate of antenna resources can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of MIMO channel signal transmission, and in particular, to a novel generalized multi-stream space shift keying method and system. Background Art

[0002] Space Shift Keying (SSK) technology is a multiple-input multiple-output (MIMO) modulation technology. It encodes and maps the input bit information onto the space effectively activated antenna indices to achieve low-complexity multi-antenna transmission. Specifically, in SSK technology, only one transmitting antenna is active at each moment, and the state of the active antenna is defined as the transmission pattern. Different information bits are mapped to different spatial patterns, and the receiver recovers the information by estimating the transmission pattern. Suppose there are N t transmitting antennas, and the transmission spectral efficiency of the space shift keying technology is log 2 N t bps / Hz.

[0003] Generalized Space Shift Keying (GSSK) is another multiple-input multiple-output modulation technology. It transmits data by simultaneously activating multiple antennas in each transmission time slot, thereby improving the spectral efficiency of the system. GSSK technology is an extension of the traditional space shift keying, allowing multiple transmitting antennas to be activated simultaneously to make full use of the space resources. Suppose the system can activate at most n antennas simultaneously, then the spectral efficiency of the generalized space shift keying technology is

[0004] Multi-stream Space Shift Keying (MSSK) technology is an emerging multiple-input multiple-output modulation technology. By dividing the data into multiple streams and performing space shift keying modulation on each stream of data, it improves the spectral efficiency of the SSK system by increasing multiple transmission streams without changing the antenna configuration of the existing SSK system. Suppose there are M streams of data, and the spectral efficiency of the multi-stream space shift keying technology can reach

[0005] However, with the rapid development of the communication industry, the spectral efficiency of the above three multiple-input multiple-output modulation technologies is still difficult to meet the performance requirements. The insufficient spectral efficiency and antenna resource utilization have become important factors restricting the development of the industry. Therefore, there is an urgent need for a multiple-input multiple-output modulation technology with higher spectral efficiency and antenna resource utilization to meet the transmission needs. Summary of the Invention

[0006] The present invention aims to solve at least one of the above technical problems existing in the prior art.

[0007] To this end, a first aspect of the present invention provides a novel generalized multi-stream space shift keying method.

[0008] A second aspect of the present invention provides a novel generalized multi-stream space shift keying system.

[0009] The present invention provides a novel generalized multi-stream space shift keying method, including:

[0010] Selecting a modulation symbol for each stream of multi-stream data;

[0011] Performing GSSK modulation on each stream of data respectively, and determining the activation sequence by using the antenna index combination;

[0012] Determining the transmission vector of each stream of data according to the modulation symbol corresponding to each stream of data;

[0013] Superposing the transmission vectors of each stream of data to obtain the total transmission signal;

[0014] Allocating the total transmission signal to the antennas for transmission in a mapping manner, wherein, according to the antenna index combination, the combined signal is allocated to the activated antennas.

[0015] According to the novel generalized multi-stream space shift keying method of the above technical solution of the present invention, it may further have the following additional technical features:

[0016] In the above technical solution, the selecting a modulation symbol for each stream of multi-stream data includes:

[0017] Selecting M different constellation point modulation symbols and respectively allocating them to M streams of data, wherein the amplitudes of the modulation symbols corresponding to each stream of data are different.

[0018] In the above technical solution, the phase difference between the modulation symbols corresponding to two adjacent streams of data is π / 2.

[0019] In the above technical solution, the amplitude ratio of the modulation symbols corresponding to two adjacent streams of data is AMP.

[0020] In the above technical solution, the determining the transmission vector of each stream of data according to the modulation symbol corresponding to each stream of data includes:

[0021] The first stream of data generates a transmission vector through GSSK modulation wherein, n antennas are activated as s 1 s 1 represents the modulation symbol of the first stream of data;

[0022] The m-th stream of data generates a transmission vector through GSSK modulation wherein, n antennas are activated as s m s mdenotes the modulation symbol of the m-th stream of data, where m is an integer greater than 1 and less than M;

[0023] The M-th stream of data is modulated by GSSK to generate a transmission vector where n antennas are activated as s M , s M denotes the modulation symbol of the M-th stream of data;

[0024] where each stream of data can activate n antennas at the same time.

[0025] In the above technical solution, when there is no modulation symbol transmission on a certain antenna allocated to the first stream of data, all modulation symbols in the subsequent data streams are inverted.

[0026] In the above technical solution, the method of allocating the total transmission signal to the antennas for transmission by mapping includes:

[0027] Performing energy normalization on the total transmission signal;

[0028] Allocating the normalized total transmission signal to each antenna; each antenna transmits the corresponding signal according to its activation status.

[0029] In the above technical solution, it further includes:

[0030] Establishing a transmission symbol codebook corresponding to the information to be transmitted;

[0031] Searching for the corresponding information to be transmitted according to the codebook at the receiving end of the antenna transmitting signal to obtain the transmission data at the transmitting end.

[0032] In the above technical solution, the spectral efficiency of transmitting information based on the novel generalized multi-stream space shift keying method is where M is the number of streams of multi-stream data, n is the number of simultaneously activated transmitting antennas, and N t is the total number of transmitting antennas.

[0033] The present invention also provides a novel generalized multi-stream space shift keying system, including:

[0034] A serial-to-parallel conversion unit that receives input data, converts the input serial data stream into a parallel data stream, and forms multi-stream data;

[0035] A GSSK modulation unit that selects a modulation symbol for each stream of multi-stream data, performs GSSK modulation on each stream of data separately, maps the bits in each stream of data to the corresponding modulation symbol, generates a transmission vector corresponding to each stream of data according to the mapping result; and selects an antenna index combination according to the GSSK modulation rule, and activates the corresponding antenna according to the antenna index combination;

[0036] A signal synthesis unit, connected to the GSSK modulation unit, superimposes the transmit vectors of each stream of data to obtain the total transmit signal;

[0037] A constellation mapping unit, connected to the signal synthesis unit, maps the synthesized total transmit signal onto a constellation diagram to generate the final transmit signal;

[0038] A transmit antenna unit, including a plurality of transmit antennas, each transmit antenna is connected to the constellation mapping unit. The transmit antenna unit distributes the final transmit signal to each antenna, and each antenna transmits a corresponding signal according to its activation state.

[0039] In summary, due to the adoption of the above technical features, the beneficial effects of the present invention are:

[0040] The present invention selects a modulation symbol for each stream of data in multi-stream data and determines the activation sequence by using antenna index combinations, which can activate multiple antennas at the same time, thereby significantly improving the spectral efficiency. Compared with traditional modulation methods, the present invention can transmit more data within a limited bandwidth, meeting the requirements of modern communication systems for high data transmission rates. Specifically, generalized space shift keying modulation is performed on each stream of data to increase the number of antenna combinations utilized, thereby improving the spectral utilization efficiency, and the spectral efficiency can reach

[0041] The present invention transmits each stream of data by activating multiple antennas, fully utilizing the antenna resources and improving the utilization rate of antennas. This not only improves the performance of the system, but also reduces the idle rate of antennas and the hardware cost of the system. In addition, in the method provided by the present invention, the number of transmit antennas is not limited by the power of 2, further improving the utilization rate of antenna resources.

[0042] Furthermore, the present invention can effectively resist channel interference and noise and improve the anti-interference ability of the system by selecting different modulation symbol and antenna index combinations. The design with a phase difference of π / 2 and an amplitude ratio of AMP between the modulation symbols corresponding to two adjacent streams of data further enhances the anti-interference performance of the signal and reduces the bit error rate. The present invention also ensures the same average power for different modulation methods through energy normalization operations, thereby optimizing the transmission quality of the signal. This helps to improve the stability and reliability of the signal and reduce the distortion and interference of the signal during transmission.

[0043] The method and system design of the present invention have high flexibility and can adjust the number of streams of multi-stream data, the number of activated antennas, and the parameters of modulation symbols according to actual needs. This enables the present invention to adapt to different communication scenarios and requirements and has a wide range of application prospects.

[0044] Additional aspects and advantages of the present invention will become apparent in the following description section, or will be learned through the practice of the present invention. Description of the Drawings

[0045] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0046] Figure 1 is a flowchart of a novel generalized multi-stream space shift keying method according to an embodiment of the present invention;

[0047] Figure 2 is a performance comparison diagram between a novel generalized multi-stream space shift keying method (GMSSK) according to an embodiment of the present invention and a traditional MSSK algorithm;

[0048] Figure 3 is a performance comparison diagram of a novel generalized multi-stream space shift keying method (GMSSK) according to an embodiment of the present invention under different numbers of receiving antennas;

[0049] Figure 4 is a framework diagram of a novel generalized multi-stream space shift keying system according to an embodiment of the invention. Detailed Embodiments

[0050] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0051] Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention may be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0052] The following refers to Figures 1 to 4 to describe a novel generalized multi-stream space shift keying method and system according to some embodiments of the present invention.

[0053] Some embodiments of the present application provide a novel generalized multi-stream space shift keying method.

[0054] As Figure 1 shown, a first embodiment of the present invention proposes a novel generalized multi-stream space shift keying method, including the following steps S1 - S5.

[0055] S1. Select a modulation symbol for each stream of multi-stream data.

[0056] In some embodiments, before performing step S1, the input serial data stream is converted into a parallel data stream by a serial-to-parallel conversion unit to form multi-stream data. Assume the number of streams of the multi-stream data is M, and each stream of data will be modulated and transmitted independently.

[0057] Select a modulation symbol for each stream of the multi-stream data. Select M different constellation point modulation symbols and assign them to the M streams of data respectively. The modulation symbols of the M streams of data are s 1 , s 2 , …, s M ; among them, the amplitudes of the modulation symbols corresponding to each stream of data are different. The phase difference between the modulation symbols corresponding to two adjacent streams of data is π / 2, and the amplitude ratio is AMP. For example, for the first stream of data and the second stream of data, the phase difference of their modulation symbols is π / 2, and the amplitude ratio is AMP.

[0058] In a specific embodiment, when M = 2, s 1 = 1 and s -1 = AMP*i can be selected as the modulation symbols.

[0059] S2. Perform GSSK modulation on each stream of data respectively, and determine the activation sequence by using the antenna index combination. It can be understood that in step S2, the traditional GSSK modulation method can be followed, which will not be elaborated here.

[0060] S3. Determine the transmission vector of each stream of data according to the modulation symbol corresponding to each stream of data.

[0061] Specifically, assume that n antennas are activated at the same time for each stream of data, then there are:

[0062] The first stream of data generates a transmission vector after GSSK modulation Among them, n antennas are activated as s 1 , s 1 represents the modulation symbol of the first stream of data;

[0063] The m-th stream of data generates a transmission vector after GSSK modulation Among them, n antennas are activated as s m , s m represents the modulation symbol of the m-th stream of data, and m is an integer greater than 1 and less than M;

[0064] The M-th stream of data generates a transmission vector after GSSK modulation Among them, n antennas are activated as s M , s M represents the modulation symbol of the M-th stream of data.

[0065] In some embodiments, when there is no modulated symbol transmission on a certain antenna to which the first stream of data is allocated, all the modulated symbols in the subsequent data streams are inverted. This can effectively increase the Euclidean distance, and thus contribute to improving the anti-interference ability and bit error rate performance of the system.

[0066] S4. Superimpose the transmit vectors of each stream of data to obtain the total transmit signal It can be understood that signal synthesis can be achieved through simple superimposition operations, or more complex synthesis algorithms can be used to optimize the quality and performance of the signal.

[0067] S5. Allocate the total transmit signal to the antennas for transmission by means of mapping, where, according to the antenna index combination, the synthesized signal is allocated to the active antennas.

[0068] In some embodiments, step S5 includes:

[0069] Perform an energy normalization operation on the total transmit signal such that E[s H s]=1; ensure that the average power of different modulation methods is the same, thereby optimizing the transmission quality of the signal and reducing distortion and interference of the signal during transmission.

[0070] Allocate the normalized total transmit signal to each antenna; each antenna transmits the corresponding signal according to its active state. By means of mapping, the total transmit signal is allocated to each transmit antenna for transmission, where, according to the antenna index combination, the synthesized signal is allocated to the active antennas.

[0071] In some embodiments, GMSSK further includes:

[0072] Establish a transmission symbol codebook corresponding to the information to be transmitted; the transmission symbol codebook records the modulation symbols and antenna index combinations corresponding to each type of information to be transmitted, providing a reference for demodulation at the receiving end.

[0073] At the receiving end of the antenna transmitting the signal, look up the corresponding information to be transmitted according to the codebook to obtain the transmission data at the transmitting end. The receiving end completes the demodulation process by detecting the received signal and combining the transmission symbol codebook to determine the transmission information at the transmitting end.

[0074] Based on the above new generalized multi-stream space shift keying method, the spectral efficiency of the transmitted information is where M is the number of streams of multi-stream data, n is the number of simultaneously active transmit antennas, and N t is the total number of transmit antennas.

[0075] Figure 2The performance comparison between the GMSSK algorithm of the present invention and the traditional MSSK algorithm is shown. It can be seen that when the number of receiving antennas is the same as the number of transmitting antennas, the performance of the GMSSK algorithm of the present invention is significantly better than that of the traditional MSSK algorithm. When the number of transmitting antennas is relatively smaller, the performance of the GMSSK algorithm of the present invention is still better than that of the traditional MSSK algorithm.

[0076] Figure 3 It shows that for the GMSSK algorithm of the present invention with different numbers of receiving antennas, the more the number of receiving antennas, the better the performance of the algorithm. Therefore, under the condition of permission, more receiving antennas can be set to improve the performance. It can also prove that the GMSSK algorithm of the present invention can well handle the application scenario with fewer transmitting antennas and more receiving antennas.

[0077] To further illustrate the specific process of the GMSSK algorithm of the present invention, in a specific embodiment, the number of transmitting antennas N t = 4, the number of data streams M = 2. Two different modulation symbols are selected for the two streams of data. The modulation symbols are 1 and i respectively, and AMP = 1.5. Then the modulation symbols of the two streams of data are 1 and 1.5i respectively. Among them, the first stream of data selects 1 as the transmission symbol, and the second stream of data selects -1 as the transmission symbol. The transmission symbol codebook is shown in Table 1.

[0078] Table 1 GMSSK codebook N t = 4, M = 2, AMP = 1.5, η = 4bps / Hz

[0079] Information to be transmitted Transmission symbol Information to be transmitted Transmission symbol 0000 [1 + 1.5i 1 + 1.5i 0 0] 1000 [1 + 1.5i -1.5i 0 1] 0001 [1 + 1.5i 1 - 1.5i 0] 1001 [1 + 1.5i 0 - 1.5i 1] 0010 [1 + 1.5i 1 0 - 1.5i] 1010 [1 + 1.5i 0 0 1 + 1.5i] 0011 [1 1 + 1.5i - 1.5i 0] 1011 [1 - 1.5i - 1.5i 1] 0100 [1 + 1.5i - 1.5i 1 0] 1100 [1.5i 1 + 1.5i 1 0] 0101 [1 + 1.5i 0 1 + 1.5i 0] 1101 [-1.5i 1 1 + 1.5i 0] 0110 [1 + 1.5i 0 1 - 1.5i] 1110 [-1.5i 1 1 - 1.5i] 0111 [1 - 1.5i 1 + 1.5i 0] 1111 [0 1 + 1.5i 1 + 1.5i 0]

[0080] Perform GSSK modulation on the two streams of data. Assume that the transmission vector of the first stream of data is [1, 1, 0, 0] T , and the transmission vector of the second stream is [1.5i, 1.5i, 0, 0] T . Add them to get the transmission vector [1 + 1.5i, 1 + 1.5i, 0, 0] T . Taking this as an example, 2 out of 4 transmitting antennas are activated simultaneously. The available antenna index numbers for the first stream of data are The available antenna index numbers for the second stream of data are Since the transmitted bits are limited by powers of 2, a total of 2 4 combinations can be utilized, and the spectral efficiency is 4bps / Hz.

[0081] As Figure 4 shown, some other embodiments of the present invention also provide a novel generalized multi-stream space shift keying system, including: a serial-to-parallel conversion unit, a GSSK modulation unit, a signal synthesis unit, a constellation mapping unit, and a transmitting antenna unit.

[0082] The serial-to-parallel conversion unit receives input data, converts the input serial data stream into a parallel data stream, and forms multi-stream data. The GSSK modulation unit selects a modulation symbol for each stream of data in the multi-stream data, performs GSSK modulation on each stream of data separately, maps the bits in each stream of data to the corresponding modulation symbol, and generates a transmission vector corresponding to each stream of data according to the mapping result; and selects an antenna index combination according to the GSSK modulation rule, and activates the corresponding antenna according to the antenna index combination. The signal synthesis unit is connected to the GSSK modulation unit, and superimposes the transmission vectors of each stream of data to obtain the total transmission signal. The constellation mapping unit is connected to the signal synthesis unit, maps the synthesized total transmission signal onto the constellation diagram, and generates the final transmission signal. The transmitting antenna unit includes a plurality of transmitting antennas, each transmitting antenna is connected to the constellation mapping unit, and the transmitting antenna unit distributes the final transmission signal to each antenna, and each antenna transmits the corresponding signal according to its activation state.

[0083] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0084] Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A novel generalized multi-stream space shift keying method, characterized in that: include: Selecting a modulation symbol for each stream data in the multiple stream data; Perform GSSK modulation on each data stream and use the antenna index combination to determine the activation sequence number; Determine a transmission vector of each stream data according to a modulation symbol corresponding to the stream data; The transmission vectors of each stream data are superimposed to obtain the total transmission signal; The total transmission signal is allocated to the antennas for transmission by mapping, wherein the composite signal is allocated to the activated antennas according to the antenna index combination.

2. The novel generalized multi-stream space shift keying method according to claim 1 is characterized in that: The selecting a modulation symbol for each stream data in the multi-stream data comprises: M different constellation point modulation symbols are selected and allocated to M streams of data respectively, wherein the amplitude of the modulation symbol corresponding to each stream of data is different.

3. The novel generalized multi-stream space shift keying method according to claim 2 is characterized in that: The phase difference between the modulation symbols corresponding to two adjacent streams of data is π / 2.

4. The novel generalized multi-stream space shift keying method according to claim 2 is characterized in that: The amplitude ratio of the modulation symbols corresponding to two adjacent streams of data is AMP.

5. The novel generalized multi-stream space shift keying method according to claim 2 is characterized in that: The determining the transmission vector of the stream data according to the modulation symbol corresponding to each stream data includes: The first stream data is modulated by GSSK to generate a transmission vector Among them, n antennas are activated as s1, s1 represents the modulation symbol of the first stream data; The mth stream data is modulated by GSSK to generate a transmission vector Among them, n antennas are activated as s m ,s m represents the modulation symbol of the mth stream data, where m is an integer greater than 1 and less than M; The Mth stream data is modulated by GSSK to generate a transmission vector Among them, n antennas are activated as s M ,s M A modulation symbol representing the Mth stream data; Among them, each stream of data can activate n antennas at the same time.

6. The novel generalized multi-stream space shift keying method according to claim 5 is characterized in that: When a certain antenna to which the first stream data is allocated has no modulation symbol to transmit, all modulation symbols in the subsequent data streams are inverted.

7. The novel generalized multi-stream space shift keying method according to claim 1 is characterized in that: The method of allocating the total transmission signal to the antennas for transmission by mapping includes: Performing energy normalization operation on the total transmitted signal; The normalized total transmitted signal is distributed to each antenna; each antenna sends a corresponding signal according to its activation state.

8. The novel generalized multi-stream space shift keying method according to claim 1 is characterized in that: Also includes: Establishing a transmission symbol codebook corresponding to the information to be transmitted; The receiving end of the antenna sending the signal searches the corresponding information to be transmitted according to the code book to obtain the sending data of the transmitting end.

9. The novel generalized multi-stream space shift keying method according to claim 1 is characterized in that: The spectral efficiency of information transmission based on the novel generalized multi-stream space shift keying method is: Where M is the number of multi-stream data streams, n is the number of simultaneously activated transmit antennas, and N t is the total number of transmitting antennas.

10. A novel generalized multi-stream space-shift keying system, characterized in that: include: A serial-to-parallel conversion unit receives input data and converts the input serial data stream into a parallel data stream to form multi-stream data; The GSSK modulation unit selects a modulation symbol for each stream of the multi-stream data, performs GSSK modulation on each stream of the data, maps the bits in each stream of the data to the corresponding modulation symbol, generates a transmission vector corresponding to each stream of the data according to the mapping result, selects an antenna index combination according to the GSSK modulation rule, and activates the corresponding antenna according to the antenna index combination; The signal synthesis unit is connected to the GSSK modulation unit and superimposes the transmission vectors of each stream data to obtain a total transmission signal; The constellation mapping unit is connected to the signal synthesis unit, and maps the synthesized total transmission signal to the constellation diagram to generate a final transmission signal; The transmitting antenna unit includes a plurality of transmitting antennas, each transmitting antenna is connected to the constellation mapping unit, and the transmitting antenna unit distributes the final transmitting signal to each antenna, and each antenna sends a corresponding signal according to its activation state.

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