Descending multi-user association space division multiplex signal transmitting and receiving method

A technology of space division multiplexing and transmission method, applied in signal channel, error prevention/detection through diversity reception, multi-frequency code system, etc., can solve problems such as inability to use space division multiplexing technology, limited number of antennas, etc.

Inactive Publication Date: 2008-08-20
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the number of antennas that the terminal can support is limited (usually there is only one antenna), the method of the prior art cannot use the space division multiplexing technology

Method used

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  • Descending multi-user association space division multiplex signal transmitting and receiving method
  • Descending multi-user association space division multiplex signal transmitting and receiving method
  • Descending multi-user association space division multiplex signal transmitting and receiving method

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Embodiment 1

[0097] FIG. 3 is a block diagram of downlink multi-user space division multiplexing, assuming that the number of antennas at the transmitting end (such as a base station) is equal to the number of users of space division multiplexing (that is, the number of transmitting antennas is equal to the number of receiving antennas). a 1 , a 2 ,...a K are the pre-transmission signals of the K transmitting antennas at the same time and on the same subcarrier respectively. Here we ignore the IFFT (Inverse Fast Fourier Transform) at the sending end and the FFT (Fast Fourier Transform) module at the receiving end, and all signals are processed in the frequency domain. The specific implementation includes the following steps:

[0098] 1) The sending end and the receiving end perform QL (orthogonal lower triangular matrix) decomposition on the channel estimation matrix H respectively, and H=F can be obtained T ×S. Among them, F is a K-dimensional orthogonal matrix; S is a K-dimensional ...

specific Embodiment approach

[0115] In the present invention, the transmission power of each transmitting antenna can be further adjusted by using the water filling theorem, so as to improve the channel capacity of the system. See Figure 4 for a specific implementation. Similarly, a 1 , a 2 ,...a K are the pre-transmission signals sent by K transmitting antennas at the same time and on the same subcarrier respectively, and the number of transmitting antennas is K. Ignoring the IFFT module at the sending end and the FFT module at the receiving end, all signals are processed in the frequency domain. The specific implementation method comprises the following steps:

[0116] 1) The sending end and the receiving end respectively perform QL decomposition on the channel estimation matrix H to obtain the ideal channel estimation matrix H=F T ×S. Among them, F is a K-dimensional orthogonal matrix, and S is a K-dimensional lower triangular matrix;

[0117] 2) The transmitting end allocates transmission power...

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Abstract

Transmitting and transmitting-receiving methods of descending multi-user unite space division multiplexing signal includes: sending terminal, according to known channel estimate matrix H, executes preliminary treatment for descending pre-transmitting signal which is pre-transmitted to receiving end, and each signal is transmitted by estimating mutual interference degree affected by channel between transmitted signals, and balancing out the interference from other signal on every pre transmitting signal by using pre encode modus; receiving end receives signal, then signal is executed range equilibrium and demodulation respectively, at last pre-transmitting signal is obtained. The invention can implementing multi-user space division multiplexing in OFDMA systemic descending, making multipleuser using identical time frequency resource, improving transmission rate and capacity of communicating system descending greatly.

Description

technical field [0001] The present invention relates to a multiple input output (Multiple Input Multiple Output, MIMO) system in the field of digital communication, in particular to a method for sending and receiving downlink multi-user joint space division multiplexing signals. Background technique [0002] V-BLAST (Vertical-Bell Labs Layered Space-Time, vertical layered space-time) is a space division multiplexing (Spatial-Multiplex, SM) technology, which decomposes the channel space of the MIMO system, and multiple channels Different data streams are transmitted in parallel on several spatial sub-channels, which greatly improves the data transmission rate of the system. [0003] As a multi-carrier transmission mode, Orthogonal Frequency Division Multiplexing (OFDM) converts a set of high-speed serially transmitted data streams into a set of low-speed parallel transmitted data streams, enabling the system to be frequency-selective to multipath fading channels. Sensitivity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L25/03H04L5/02H04L27/26
Inventor 李玉洁刘巧艳
Owner ZTE CORP
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