A Method of Constructing Eigenvectors in Time Domain to Identify Space-Time Block Codes
A technology of space-time block codes and eigenvectors, applied in multi-frequency code systems, preventing/detecting errors through diversity reception, digital transmission systems, etc., can solve problems such as STBC identification, achieve low calculation, high identification performance, The effect of strong practical value
Active Publication Date: 2022-05-03
NAVAL AVIATION UNIV
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In 2015, Karami and Dobre et al. used second-order cyclostationary statistics to identify SM and Alamouti STBC under OFDM conditions. The performance of this algorithm is also good when receiving antennas ≥ 2, but this algorithm cannot be used for STBC under the condition of single receiving antenna. to identify
In the same year, Eldemerdash et al. proposed a method for identifying STBC signals using second-order correlation functions. Using the different characteristics of the second-order time-delay correlation function values of received signals corresponding to different codes, by checking whether there are peaks in different code correlation functions, the STBC signal can be identified. For identification, the algorithm is tested when the number of receiving antennas is ≥ 2, and it is not applicable to the case of a single receiving antenna
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[0067] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0068]
[0069] In the embodiment: the OFDM signal is generated based on the IEEE802.11e standard, and the sampling time interval is 91.4 μs. The default experimental conditions are: QPSK modulation is used to modulate the OFDM signal, and the carrier frequency f c =2.5GHz, the number of subcarriers is N=256, the number of cyclic prefixes is v=N / 4, and the number of OFDM blocks is N b =1000, the number of receiving antennas is N r =1. The channel is an equal-gain slow-fading frequency selection channel, and the maximum path number p max =3, the channel model adopts the exponential energy delay model, P(p)=P(0)e -p / 5 , p=0,1,...,p max , where P(0) is the power of the first path, p is the path number, and p max is the number of the last path. The receiver uses a Butterworth filter to filter out-of-band noise, and the signal-to-noise ra...
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The invention discloses a method for constructing eigenvectors in the time domain to identify space-time block codes. Considering frequency selection channels and STBC-OFDM signal models, combined with the correlation of space-time block codes, firstly according to the correlation of space-time block codes , construct the fourth-order eigenvector of the received signal, and then identify four STBC-OFDM signals according to the different fourth-order eigenvectors of different STBC-OFDM signals. The algorithm can identify the received signal in the time domain when the size of the OFDM block is known, without the need for time delay, phase noise, frequency offset and other information, and the identification effect is better. The present invention can be directly applied to non-cooperative STBC-OFDM communication systems, and can also be used in corresponding software radio systems and the like.
Description
technical field [0001] The invention belongs to a space-time block code identification method in the field of cognitive radio. Background technique [0002] In cognitive radio, signal recognition is one of the key research issues in recent years, and it is widely used in military and civilian fields. In the military, the enemy's communication parameters are not easy to obtain. Through signal identification, useful information in the enemy's signal can be identified, so as to gain an advantage in the war. Therefore, signal identification is an important task in communication reconnaissance; In the field of cognitive wireless, the vigorous development of wireless communication has brought infinite possibilities to wireless communication. The intelligent selection of communication methods is the trend of future development. The receiver should be able to identify and analyze the signal, so as to choose the optimal transmission scheme. [0003] Space-time block coding (STBC) is...
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IPC IPC(8): H04L1/06H04L27/26H04B7/0413H04L27/32
CPCH04L1/0618H04L1/0643H04L1/0631H04L27/2647H04B7/0413H04L27/2697H04L27/32
Inventor 闫文君凌青张立民方伟张兵强方君徐涛
Owner NAVAL AVIATION UNIV