Joint estimation method for activated antennas and modulation symbols of generalized spatial modulation (GSM) system
A generalized spatial modulation and modulation symbol technology, applied in the field of joint estimation of activated antennas and modulation symbols, can solve problems such as low reliability, limited use range, high complexity of ML detection algorithms, etc., to achieve strong adaptability, improve reliability, The effect of reducing the complexity of the algorithm
Inactive Publication Date: 2016-11-16
NANJING UNIV OF SCI & TECH
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[0006] It can be seen from the above that in the prior art, the extremely high complexity of the ML detection algorithm limits its scope of application
Although linear detection has low complexity, its reliability is extremely low, and it is difficult to meet the data accuracy requirements of practical applications
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[0042] The whole system consists of figure 1 , the system is a GSM-MIMO system with 5 transmissions and 8 receptions. Number of active antennas N t is 2, the data bit stream length is 5×10 6 bits, the modulation mode is 4-QAM, and the two active antennas send the same modulation symbols. Assuming that the transmission channel is a flat Rayleigh fading channel, the channel state information is known at both the sending and receiving ends, and the receiving end has achieved timing and symbol synchronization.
[0043] In the GSM-MIMO system, the specific steps of the joint estimation method of active antennas and modulation symbols of the generalized spatial modulation system are as follows:
[0044] Step 1. Calculate the probability measure value of each transmit antenna as an active antenna, the formula used is:
[0045] l k =(h k ) + the y
[0046] In the formula, l k Indicates the probability metric value of the kth transmitting antenna as the active antenna, k∈[1,5]...
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The invention discloses a joint estimation method for activated antennas and modulation symbols of a generalized spatial modulation (GSM) system. For a receipt signal of the GSM-MIMO system, firstly a zero forcing (ZF) linear detection method with extremely low complexity is used for estimating most possible transmission symbols respectively corresponding to all possible antenna combinations, and then Euclid distances between the receipt signal and estimated results are computed and reliability of the estimated results is judged. For the ZF linear detection, a sorting method for preferentially estimating the combination with high reliability is introduced; for judgment on reliability, a judgment threshold is introduced, and if the Euclid distances are less than the threshold, the estimated results are judged to be reliable. The method of the invention is low in computation complexity and still has good performance even under relatively low signal-to-noise ratios, and error rate performance of the method is close to that of an ML detection method when the signal-to-noise ratio is high. As the judgment threshold can be flexibly selected according to practical situations to meet requirements on the complexity and the error rate in practical applications, the method of the invention has better adaptability.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a method for jointly estimating activated antennas and modulation symbols of a generalized space modulation system. Background technique [0002] The emerging new MIMO technology represented by Spatial Modulation (Spatial Modulation, SM) and Space Shift Keying (Generalized SSK, GSSK) uses multi-antenna technology to increase the transmission rate. Among them, the sending end of the SM system only activates one antenna to send data each time, which eliminates inter-channel interference (Inter-channel Interface, ICI) and improves energy efficiency (Energy Efficiency, EE). The sending end of the GSSK system activates several antennas each time to send data, and the sent data is the same data symbol. By combining the concepts of SM-MIMO and GSSK-MIMO, a Generalized Spatial Modulation-MIMO system (Generalized Spatial Modulation-MIMO, GSM-MIMO) is generated. [0003] T...
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IPC IPC(8): H04B7/04H04B7/08H04L5/00
CPCH04B7/0848H04B7/0413H04L5/0023
Inventor 王芮朱唯唯谢仁宏芮义斌郭山红李鹏张家庆陈倩
Owner NANJING UNIV OF SCI & TECH