Adaptive switching method between spatial division multiplexing and code division multiplexing

A technology of adaptive switching and code division multiplexing, applied in the field of communication, can solve problems such as throughput improvement and degree of freedom impact, and achieve the effect of increasing capacity

Inactive Publication Date: 2009-02-11
ZTE CORP
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Problems solved by technology

[0006] However, MIMO spatial multiplexing is affected by the degree of freedom of the spatial channel, not all wireless environment MIMO spatial multiplexing technologies can bring expected throughput improvements

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  • Adaptive switching method between spatial division multiplexing and code division multiplexing
  • Adaptive switching method between spatial division multiplexing and code division multiplexing
  • Adaptive switching method between spatial division multiplexing and code division multiplexing

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Embodiment Construction

[0019] The specific implementation manners of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] figure 1 It is a flowchart of an adaptive switching method for space division multiplexing and code division multiplexing used in a time division synchronous code division multiple access system according to the present invention. Wherein, the user terminal in the system has two antennas, and the node B transmits two transmission blocks to the user terminal at the same time and transmits them to the user terminal through different antennas, such as figure 1 As shown, the adaptive switching method includes the following steps:

[0021] S102, the Node B estimates the uplink channel, and evaluates the spatial channel cross-correlation of two transmission blocks in real time according to the uplink channel estimation result.

[0022] S104. Switch to a code division multiplexing mode if the spatial channel cross-correlation is...

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Abstract

The invention provides a self-adaptive switching method of space division multiplexing and code division multiplexing for a time division synchronous code division multiple access system. One method comprises the following steps: S102, estimating an uplink channel by a node B, and real-timely evaluating the mutual relativity of the space channels of two transmission blocks according to the estimation result; S104, switching to the code division multiplexing mode when the mutual relativity of the space channels is larger than a first threshold, and carrying out throughput evaluation when the mutual relativity of the space channels is smaller than the first threshold; S106, respectively estimating the throughput of the space division multiplexing mode and the code division multiplexing mode by the node B according to the channel quality of the space division multiplexing mode or the code division multiplexing mode fed back by a user terminal, and switching to the space division multiplexing mode if the total throughput of the space division multiplexing mode is larger than a second threshold more than the throughput of the code division multiplexing mode, otherwise, switching to the code division multiplexing mode; and S108, informing the user terminal of the multiplexing mode adopted by the subsequent downlink service channel and the related information by the node B through a downlink control channel.

Description

technical field [0001] The invention relates to the communication field, in particular to an adaptive switching method for space division multiplexing and code division multiplexing used in a time division synchronous code division multiple access system. Background technique [0002] MIMO (Multiple-Input Multiple-Output) technology is a hot research field in the field of mobile communication in recent years, and it is characterized in that both the wireless transmitter and the receiver introduce multiple antennas. Compared with the traditional single-input single-output (SISO) system, the MIMO system obtains a great increase in system capacity through space diversity technology or space multiplexing technology. Multiple-input single-output (MISO) and single-input multiple-output (SIMO) are two special forms of MIMO, that is, multiple antennas are only used at one end of the communication link, and a single antenna is still used at the other end. [0003] The mainstream sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04B7/216H04Q7/38
Inventor 耿鹏江海肖炼斌张银成
Owner ZTE CORP
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