The invention discloses a signal auxiliary channel estimation method in a case of sparse active equipment detection, which is characterized by comprising the steps that: firstly, all active equipmentsimultaneously sends training sequences and signals of the active equipment; according to the training sequences sent by the active equipment, estimating an active equipment set and channel information by a block orthogonal matching tracking algorithm; then decoding the data signals sent by the equipment by utilizing the obtained channel state information; carrying out channel estimation again byusing the decoded signals as the training sequences; and carrying out decoding again by utilizing the updated channel information. By adopting the method disclosed by the invention, part of equipmentwith faults in decoding originally can also correctly decode, and a more accurate number of the active equipment can be obtained; and for a mode with sparse active equipment detection, by adopting themethod disclosed by the invention, influence of a channel estimation error on decoding can be greatly reduced.

Signal auxiliary channel estimation method in case of sparse active equipment detection

The invention provides a time-frequency interleaving preprocessing combined method for resisting narrowband interference and impulse noise in an OFDM system. The method specifically comprises the following steps of carrying out LDPC coding and corresponding constellation labeling on a signal in the OFDM system, optimizing parameters of a time domain interleaver, and fully whitening the noise; after OFDM modulation is carried out at a sending end, utilizing cyclic shift operation of a sub-matrix of a block interleaver in a frequency domain to carry out frequency domain interleaving on OFDM sub-carriers; and carrying out noise preprocessing through an amplitude limiting method of a receiving end, and nonlinearly removing the noise and the interference which are still higher than thresholds after full interleaving. According to the method, the characteristics of the interleaver and the advantages of noise processing of a nonlinear method are fully combined, the resistance performance of the OFDM system to the narrowband interference and the impulse noise can be effectively enhanced, and compared with a traditional block interleaving method, the system transmission performance is further improved.

Time-frequency interleaving preprocessing combined method for resisting narrowband interference and impulse noise in OFDM system

The invention discloses an ultra-narrow band signal detection method in an ultra-narrow band and CP-OFDM coexistence system based on ADMM. According to the detection method, ultra-narrow band signalsin a frequency domain are modeled into single-frequency signals, and ultra-narrow band signal detection is further converted into detection of a group of multiple single-frequency signals. When ultra-narrow band signals and wide band signals coexist in an LTE-A system, the model arranges signals continuously sent by a plurality of users in a time domain into a row, takes the difference between twoparts which are not interfered by the inter-block, and according to the characteristics of CP-OFDM signals, only ultra-narrow band signals which need to be detected are contained in the difference. Asparse-low-rank joint detection method based on an ADMM method is provided. Compared with a traditional sparse detection method, the method has the advantages that joint estimation is carried out onthe low-rank performance of signals, and according to simulation verification, the algorithm is better in MSE performance and detection probability compared with three algorithms, namely, a traditional MP algorithm, an OMP algorithm and a traditional LASSO algorithm.

Ultra-narrow band signal detection method in ultra-narrow band and CP-OFDM coexistence system based on ADMM

The invention discloses a narrowband interference detection method based on distortion power removal and a communication device thereof. Narrowband interference detection is carried out by using idletime for transmitting two data packets. The method comprises the steps of firstly, obtaining a subcarrier Pmin with the minimum noise power and the position of the subcarrier Pmin; calculating an average noise power set; and finally, completing two detection processes based on the average noise power set, and judging whether the subcarrier has narrowband interference or not. The method has the advantages of fixed operation complexity and optimal performance, can be applied to application specific circuits (ASIC) and digital signal processing (DSP), can work together with high-sensitivity packet detection, and provides reliable communication on noisy channels.

Narrowband interference detection method based on distortion power removal and communication device thereof

The invention discloses a distance expansion target detection method for restraining a narrowband interference. The method comprises the following steps of step 1) acquiring target echo data and auxiliary data received by an equal-interval linear array active sonar array to obtain an observed data matrix R; step2) according to prior knowledge, weighing a target steering vector v and constructing anarrowband interference matrix H; step3) based on the observed data matrix R, carrying out unitary transformation on primary data and auxiliary data through a unitary matrix constructed by the narrowband interference matrix H, and mapping to a zero space corresponding to the narrowband interference so as to calculate a target detection statistical magnitude T; and step4) comparing the above target detection statistical magnitude T with a preset threshold eta, if the T is greater than or equal to the eta, considering that there is a target; otherwise, considering that there is no target. By using the method, the ability of an active sonar system to restrain the narrowband interference can be effectively increased and distinguished.

Distance expansion target detection method for restraining narrowband interference

The present invention relates to a combined narrowband interference detection, elimination and channel estimation method based on a continuous cyclic shift training sequence in an OFDM system. On the condition of using two OFDM symbol training sequences to carry out the channel estimation, the method utilizes a signal detection and estimation technology and a training sequence design technology to realize the asynchronous narrowband interference detection, estimation and elimination, is applied to a the OFDM systems existing the narrowband interference, such as a wireless local area network IEEE802.11a, a wireless metropolitan area network WiMAX IEEE 802.16e, etc., realizes the accurate estimation and elimination of an asynchronous narrowband signal while realizing the interference robustness detection, and enables the training sequence auxiliary channel estimation performance on an interference condition to be improved effectively.

Combined narrowband interference detection, elimination and channel estimation method based on continuous cyclic shift training sequence in OFDM system

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Combined narrowband interference detection, elimination and channel estimation method based on continuous cyclic shift training sequence in OFDM system