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A signal sending and receiving method of a cdma-mimo system using a generalized three-dimensional complementary code

A technology of signal sending and receiving methods, which is applied in the field of communication, can solve problems such as poor adaptability and high demand for system resource utilization, and achieve the effect of realizing space multiplexing and optimizing system throughput

Active Publication Date: 2016-05-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the signal transmission and reception of the current CDMA-MIMO system has poor adaptability to different communication environments and the demand for system resource utilization is high, and provides a CDMA-MIMO system using generalized three-dimensional complementary codes Signal sending and receiving methods

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  • A signal sending and receiving method of a cdma-mimo system using a generalized three-dimensional complementary code
  • A signal sending and receiving method of a cdma-mimo system using a generalized three-dimensional complementary code
  • A signal sending and receiving method of a cdma-mimo system using a generalized three-dimensional complementary code

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specific Embodiment approach 1

[0021] Specific implementation mode one: the following combination figure 1 and image 3 Describe this embodiment mode, a kind of signal transmission and reception method of the CDMA-MIMO system that adopts generalized three-dimensional complementary code described in this embodiment mode, its signal transmission process is:

[0022] Step 1. The initial data sent by K users are respectively subjected to space-time coding and spectrum spreading based on generalized three-dimensional complementary codes, and each user obtains A*M data streams;

[0023] Step 2: superimposing the data streams of K users corresponding to the same antenna and the same carrier, merging them into A*M data streams, and then modulating the data corresponding to the same antenna and the same carrier onto the same carrier, Finally, the data of the M carriers corresponding to the same antenna is combined, and the combined signal is sent to the wireless channel, and the signal transmission of the CDMA-MIMO...

specific Embodiment approach 2

[0028] Specific implementation mode two: the following combination figure 2 Describe this embodiment, this embodiment will further explain Embodiment 1, a signal transmission and reception method of a CDMA-MIMO system using a generalized three-dimensional complementary code described in this embodiment, the K users described in step 1 will send Space-time encoding and spectrum spreading based on generalized three-dimensional complementary codes are carried out on the initial data respectively, and each user obtains A*M data streams; the space-time encoding and spectrum spreading based on generalized three-dimensional complementary codes, wherein for each data signal The methods of coding and spreading are the same, and the specific implementation process of the coding and spreading method of each data signal is as follows:

[0029] For the initial data stream b sent by user k (k) , b (k) ∈{1,-1}, the initial data stream b (k) According to the channel condition, the service...

specific Embodiment approach 3

[0036] Specific implementation mode three: the following combination Figure 4Describe this embodiment. This embodiment will further explain Embodiment 1. In step 4 of this embodiment, the obtained P*M parallel signals will be despread and decoded based on generalized three-dimensional complementary codes. Each user obtains the corresponding P groups of data of P receiving antennas; the despreading and decoding based on generalized three-dimensional complementary codes, wherein the despreading and decoding methods of each data signal are the same, and the specific despreading and decoding of each data signal The implementation method is:

[0037] The signal received by the p-th antenna is obtained by carrier demodulation of M-channel data signals The generalized three-dimensional complementary code of one user k among the K users is used for complementary code despreading, p∈{1,...,P}:

[0038] The first step, matched filtering: the Copy A copies, using A sub-complementar...

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Abstract

The invention discloses a signal transmitting and receiving method for a code division multiple access multiple-input-multiple-output (CDMA-MIMO) system by employing generalized three-dimensional complementary codes, which belongs to the field of communication and aims to solve the problems that the signal transmitting and receiving method for the existing CDMA-MIMO system is low in adaptive capacity relative to different communication environments and the resource utilization rate requirement of the system is high. The method comprises the following steps: respectively performing space-time coding and spectrum spreading based on the generalized three-dimensional complementary codes on initial data transmitted by K users; superposing and merging a data flow which corresponds to the same antenna and the same carrier, modulating the data which corresponds to the same antenna and the same carrier to the same carrier for merging and transmitting; then simultaneously receiving the signal by employing P receiving antennas, respectively performing carrier demodulation by employing M carriers after each path of signal is synthesized, and despreading and decoding based on the generalized three-dimensional complementary codes, wherein each user acquires P groups of data corresponding to the P receiving antennas; merging and judging by employing the maximum ratio merger criterion, and outputting the data. The method is used for transmitting and receiving signals.

Description

technical field [0001] The invention relates to a method for sending and receiving a multi-user MIMO system based on a generalized orthogonal three-dimensional complementary code, belonging to the communication field. Background technique [0002] In the future mobile communication system, Multiple Input Multiple Output (Multiple Input Multiple Output, MIMO) technology will surely become the dominant wireless transmission technology. The biggest advantage of MIMO technology is that the use of space diversity (SpaceDiversity) enables the system to increase the transmission rate and reduce the error rate without increasing spectrum resources and antenna transmission power. Space-time coding is currently a coding method commonly used in MIMO systems to achieve space diversity, and its fundamental mechanism is to make data sent from different transmitting antennas have certain orthogonality through coding. However, the biggest disadvantage of space-time coding is that it does n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04B7/06H04B7/08
Inventor 孟维晓孙思月陈晓华
Owner HARBIN INST OF TECH
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