A partial maximum likelihood detection method based on energy ordering

A maximum likelihood detection and energy technology, applied in baseband system components, baseband systems, shaping networks in transmitters/receivers, etc., can solve the problems of no active antenna serial number detected, few detection methods, etc. The effect of small complexity, narrowing the search range, and reducing the number of combinations

Active Publication Date: 2019-01-08
CHANGAN UNIV
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Problems solved by technology

[0004] At present, there are few detection methods for the SM-OFDM-IM system. The existing methods can only detect the serial numbers and constellation symbols of the activated subcarriers, but do not detect the serial numbers of the activated antennas.

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  • A partial maximum likelihood detection method based on energy ordering
  • A partial maximum likelihood detection method based on energy ordering
  • A partial maximum likelihood detection method based on energy ordering

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Embodiment Construction

[0062] The present invention provides a partial maximum likelihood detection method based on energy sorting, which mainly combines space-domain index modulation and frequency-domain index modulation to form a space-frequency joint index modulation system, that is, SM-OFDM-IM. The antenna index in the frequency domain and the subcarrier index in the frequency domain can have the advantages of both.

[0063] A partial maximum likelihood detection method based on energy sorting in the present invention adopts the idea of ​​step-by-step demodulation. Firstly, the sequence number of the subcarrier is equalized by the minimum mean square error, and then the energy value is obtained for each subcarrier, and its sorting is set. Set P as the number of selected candidate subcarriers, and then use the maximum likelihood to detect part of the subcarrier numbers, antenna numbers and constellation symbols.

[0064] Based on one with N t root transmitting antenna, N r The root receiving an...

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Abstract

The invention discloses a partial maximum likelihood detection method based on energy ordering. Firstly, the minimum mean square error (MMSE) equalization is used to equalize the number of subcarriers, then the energy value of each subcarrier is calculated and sorted to set the number of candidate subcarriers p, and then the maximum likelihood detection is used to detect the number of partial subcarriers, antenna number and constellation symbol. Sub-carrier blocking can make up for the error retransmission defect of receiver demodulation, By comparing the power of equalized symbols on the subcarriers, the subcarrier sequence number can be demodulated, and the number of combinations traversed can be reduced by adding a partial maximum likelihood detection algorithm, which reduces the complexity to a certain extent, and the setting of P value can achieve a good tradeoff between the system bit error rate and complexity.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a partial maximum likelihood detection method based on energy sorting. Background technique [0002] Traditional information transmission resources such as air domain, frequency domain and time domain can no longer meet the needs of 5G's ever-increasing information transmission rate. Therefore, the joint air domain and frequency domain transmission information at the same time has become an emerging resource in 5G, but the increase in the number of antennas and subcarriers also brings challenges to detection, and index modulation occurs accordingly. Index modulation makes full use of the index of the transmission medium, such as transmit antenna, subcarrier, time slot or linear block code, to modulate information bits through some mapping rules. Since the power consumption generated by index bit transmission is very small, index modulation utilizes a f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/20H04L25/03H04B7/0413
CPCH04B7/0413H04L25/03159H04L27/20H04L27/2601H04L27/2627H04L27/2649
Inventor 冯兴乐牛晓珂朱文霞段国彬王相相
Owner CHANGAN UNIV
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