Patent•
Uplink communication multi-user signal detection method and device based on generalized spatial modulation
06 Jul 2018-
TL;DR: In this article, an uplink communication multi-user signal detection method and device based on generalized spatial modulation is proposed, which comprises the following steps: performing spatial modulation on uplink communications signals generated by user terminals, and transmitting the modulated uplink signals on an antenna corresponding to the user terminals; receiving the uplink messages sent by a plurality of user terminals by a base station multi-antenna receiver, and preprocessing the received signals sent by each user terminal; and carrying out iterative demodulation on the processed signals.
Abstract: The invention discloses an uplink communication multi-user signal detection method and device based on generalized spatial modulation. The method comprises the following steps: performing spatial modulation on uplink communication signals generated by user terminals, and transmitting the modulated uplink communication signals on an antenna corresponding to the user terminals; receiving the modulated uplink communication signals sent by a plurality of user terminals by a base station multi-antenna receiver, and preprocessing the modulated uplink communication signals sent by each user terminal;and carrying out iterative demodulation on the processed modulated uplink communication signals sent by each user terminal through compressed sensing of block sparse, and determining active users andcorresponding signals according to a signal recovery result. The method can improve the spectral efficiency and energy efficiency of a system, improve the detection accuracy of the active users in amulti-user scenario, reduce the bit error rate of a base station receiver, and reduce the detection complexity of the base station receiver.
Citations
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21 Dec 2018
TL;DR: In this paper, the authors implemented a multi-user detection method based on dynamic adaptive compression sensing, DEVICE, ELECTRONIC DEVICE and COMPUTER READABLE STORAGE MEDIUM, which can realize the multiuser detection in an uplink NOMA system without authorization under the URLLC scene.
Abstract: The invention implements a multi-user detection method based on dynamic adaptive compression sensing, DEVICE, ELECTRONIC DEVICE AND COMPUTER READABLE STORAGE MEDIUM. At each time slot, the estimate set of active subscribers and the residual signal are updated multiple times, and each time, the current estimate set of active subscribers and the residual signal are updated based on the last updatedestimated set of active subscribers and the correspondingly calculated residual signal until the residual signal is less than or equal to the average noise power. At this time, the estimated set of active users is equal to the true set of active users, the true number of active users and which users are in the active state can be confirmed, so that the received superimposed signals sent by multiple users can be accurately recovered. Therefore, the multi-user detection method based on the dynamic adaptive compression sensing provided by the embodiment of the invention can realize the multi-userdetection in an uplink NOMA system without authorization under the URLLC scene.
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26 Jul 2019
TL;DR: In this article, a CS-based multi-information enhanced unauthorized access method in an MMTC scene is proposed, which comprises the steps of establishing a communication system model according to a spread spectrum sequence of a base station covering all devices and pilot symbols and data symbols of all the devices.
Abstract: The invention provides a CS-based multi-information enhanced unauthorized access method in an MMTC scene. The method comprises the steps of establishing a communication system model according to a spread spectrum sequence of a base station covering all devices and pilot symbols and data symbols of all the devices; enhancing the sparsity estimation of the communication system model in a backward mode according to the diversity of the symbol frame lengths of different devices, and obtaining the sparsity and a preliminary active device set; according to the sparsity and a preliminary active equipment set, adopting modulation constellation point information to obtain an initial residual error; and according to the initial residual error, obtaining a final active equipment set, a channel matrixcorresponding to active equipment and data symbols of all equipment through a compressed sensing algorithm with fixed sparsity. According to the method, the accuracy of activity detection, channel matrix estimation and data recovery of the equipment in the MTC can be improved.
References
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TL;DR: In this paper, the authors proposed a LS-SM-MIMO scheme for the uplink (UL), where each user having multiple AEs but only a single radio frequency (RF) chain invokes SM for increasing the UL-throughput.
Abstract: Conventional spatial modulation (SM) is typically considered for transmission in the downlink of small-scale MIMO systems, where a single one of a set of antenna elements (AEs) is activated for implicitly conveying extra bits. By contrast, inspired by the compelling benefits of large-scale MIMO (LS- MIMO) systems, here we propose a LS-SM-MIMO scheme for the uplink (UL), where each user having multiple AEs but only a single radio frequency (RF) chain invokes SM for increasing the UL-throughput. At the same time, by relying on hundreds of AEs but a small number of RF chains, the base station (BS) can simultaneously serve multiple users whilst reducing the power consumption. Due to the large number of AEs of the UL-users and the comparably small number of RF chains at the BS, the UL multi-user signal detection becomes a challenging large-scale under-determined problem. To solve this problem, we propose a joint SM transmission scheme and a carefully designed structured compressive sensing (SCS)-based multi-user detector (MUD) to be used at the users and BS, respectively. Additionally, the cyclic- prefix single-carrier (CPSC) is used to combat the multipath channels, and a simple receive AE selection is used for the improved performance over correlated Rayleigh-fading MIMO channels. We demonstrate that the aggregate SM signal consisting of SM signals of multiple UL-users in one CPSC block appears the distributed sparsity. Moreover, due to the joint SM transmission scheme, aggregate SM signals in the same transmission group exhibit the group sparsity. By exploiting these intrinsically sparse features, the proposed SCS-based MUD can reliably detect the resultant SM signals with low complexity. Simulation results demonstrate that the proposed SCS-based MUD achieves a better signal detection performance than its counterparts even with higher UL-throughtput.
8 citations
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31 May 2017
TL;DR: In this paper, the authors proposed an antenna activation mapping criterion, that is, different numbers of antennas are activated through each time slot to transmit data, the requirement of sparse radio frequency of a transmitting terminal is met, and a best power distribution scheme for the system is also provided to further improve the system performance.
Abstract: The invention belongs to the technical field of communication anti-interference and particularly relates to an SM (spatial modulation) transmission method capable of activating indefinite transmitting antennas. For any transmitting antenna, the invention provides a novel antenna activation mapping criterion, that is, different numbers of antennas are activated through each time slot to transmit data, the requirement of sparse radio frequency of a transmitting terminal is met, and the system spectrum efficiency is further improved. Besides, a best power distribution scheme for the system is also provided to further improve the system performance, and the novel SM transmission scheme has excellent transmission performance than traditional SM on the premise that the antenna number and spectrum efficiency are the same.
4 citations
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23 Mar 2016
TL;DR: In this paper, a large scale MIMO efficient uplink transmission mode was proposed for uplink systems with K users and one base station, where each user was provided with two antennas, and the base station was equipped with N antennas.
Abstract: The invention discloses a large scale MIMO efficient uplink transmission mode, suitable for the uplink transmission system of K users and one base station; each user is provided with two antennas, and the base station is provided with N antennas. The base station obtains a precoding matrix meeting a certain condition, and feeds element quantized values of the precoding matrix back to the users; the users calculate the number of Alamounti code words of each transmission according to the number of users and the number of antennas configured on the base station, perform Alamounti coding and precoding on modulation signals, and add and send out precoded code words; the base station utilizes the orthogonal property of the equivalent channel matrix corresponding to the Alamounti code words to separate the Alamounti code words, and furthermore decode elements of each code word.
2 citations