Method for establishing communication system three-dimensional planisphere

A communication system and constellation diagram technology, applied in the field of communication, can solve the problems of high design complexity, achieve excellent bit error performance, low average energy, and reduce design complexity

CN104320372AActive Publication Date: 2015-01-28SYSU CMU SHUNDE INT JOINT RES INST
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2015-01-28

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Abstract

The invention relates to a method for establishing a communication system three-dimensional planisphere. The method comprises the steps that a modulation point number M of the target three-dimensional planisphere is determined; through planimetry operation, all two-dimensional hexagonal cell planispheres with modulation point numbers smaller than or equal to M are listed, and the minimum Euclidean distance of the two-dimensional hexagonal cell planispheres is 1; through solid geometry operation, the obtained two-dimensional hexagonal cell planispheres are combined, so that a plurality of candidate three-dimensional planispheres with the total modulation point number equal to M are obtained; the total energy of the candidate three-dimensional planispheres which meet the requirement that the minimum Euclidean distance is 1 is computed; and a candidate three-dimensional planisphere with the minimum total energy is selected as the target three-dimensional planisphere. According to the method, the designing complexity of the three-dimensional planisphere can be greatly lowered, and the three-dimensional planisphere with small average energy and good bit-error-rate performance can be obtained.
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Description

technical field

[0001] The invention relates to communication technology, in particular to a method for constructing a three-dimensional constellation diagram of a communication system. Background technique

[0002] In recent years, the development of communication technology has been changing with each passing day, and one of its main purposes is to greatly improve the communication quality and speed of mobile communication networks to meet the increasing needs of users for wireless network services.

[0003] The study found that expanding the traditional two-dimensional (2-Dimensional, 2-D) modulation constellation space can simultaneously improve the overall transmission bit rate and robustness of the communication system. The traditional two-dimensional modulation technology uses the amplitude and phase of electromagnetic waves to transmit the information represented by the two dimensions respectively. Documents [1]-[2] take advantage of the fact that the vector antenna...

Examples

example

[0095] Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier technology. By dividing the system frequency band into multiple orthogonal sub-carriers, multiple low-speed data streams are transmitted in parallel, while ensuring a high code rate. , which can effectively suppress Inter-Symbol Interference (ISI) caused by multipath fading.

[0096] In the following, the 16-point candidate three-dimensional constellation diagram designed in this embodiment is applied to an OFDM system, and the simulation shows that the target three-dimensional constellation diagram constructed in this embodiment has better bit error rate performance.

[0097] In the simulation process, the bit stream is randomly generated for transmission, and the modulation link mainly includes three-dimensional mapping, two-dimensional inverse fast Fourier transform (Inverse Fast Fourier Transform, IFFT), the receiver adds Gaussian white noise, and uses two-dimensional Fourier transform After transf...