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Multi-user MIMO communication system, method and apparatus for transmitting signal

A communication system and a technology for transmitting signals, applied in diversity/multi-antenna systems, transmission systems, space transmit diversity, etc., can solve problems such as the inability to guarantee the optimality of THP coding, and the inability to use user receiving antenna cooperative processing to eliminate interference , Realize the communication capacity of the system and improve the communication capacity of the system

Active Publication Date: 2011-06-01
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the cooperative processing between user receiving antennas cannot be adopted in the multi-user MIMO system, therefore, the optimality of THP coding cannot be guaranteed in the multi-user MIMO system

Method used

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  • Multi-user MIMO communication system, method and apparatus for transmitting signal
  • Multi-user MIMO communication system, method and apparatus for transmitting signal
  • Multi-user MIMO communication system, method and apparatus for transmitting signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Embodiment 1: Multi-user MIMO communication system without power water injection

[0079] FIG. 1 is a schematic diagram of transceivers of a multi-user MIMO communication system in the first embodiment.

[0080] The step of transmitting a signal in the first embodiment includes:

[0081] Step 11, for the original data s of the kth user terminal k Perform THP encoding to get x k , expressed as:

[0082] x k = { s k - L k - 1 ( Σ i = 1 k - 1 L ki x i ) } mod τ = s k - L ...

Embodiment 2

[0095] Embodiment 2: System with Power Water Injection

[0096] In the second embodiment, power water injection is performed at the transmitting end, so that the system rate is maximized under the condition that the transmitting power of the base station remains unchanged. Figure 4 Shown is a schematic diagram of the transceiver of the multi-user MIMO communication system in the second embodiment.

[0097] Let the transmission power allocated to the kth user be Wherein each element corresponds to a different data stream of the kth user, the step of transmitting a signal in the second embodiment includes:

[0098] Step 21, for the original data s of the kth user terminal k Perform THP encoding, and then use the assigned transmit power p k Adjust the transmit power of the encoded user data to obtain x k , expressed as:

[0099] x k = p k { [ s ...

Embodiment 3

[0109] Embodiment 3: Optimizing the encoding sequence

[0110] In a multi-user MIMO system, there will be performance differences if the encoding sequence is different. Therefore, how to optimize the coding order is a question worth considering. For the equivalent channel obtained by the above-mentioned processing at the transmitter, if the receivers of each user are considered, the equivalent channel gain formed by multiple streams of multiple users is given by D k , k=1,..., determined by the diagonal elements of K. For a particular encoding order π l , define D=diag(D 1 D. 2 …D K ), its diagonal element is d=(d 1 d 2 … d M ), then the achievable rate of the system obtained by the water injection algorithm at this time is:

[0111] R ( π l ) = Σ i = 1 M log 2 ...

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Abstract

The invention discloses a method of transmitting signals in a multi-user MIMO communication system, which comprises conducting the THP coding for original data, decomposing a channel matrix into the product of a block lower triangle matrix and a block upper triangle matrix with a unitary matrix, conducting the forward filtering for data obtained through the precoding by using the obtained unitarymatrix by decomposing, and obtaining transmitted signals. The invention further discloses a multi-user MIMO launching apparatus, which comprises an interference pretreating unit, a delivery unit, a forward filtering unit and a channel matrix decomposing unit. The invention further discloses a multi-user MIMO communication system. The method, the device and the system disclosed by the invention can effectively eliminate the interference among multiple users, and increase the system speed, thereby realizing the maximization of the communication capacity of the system.

Description

technical field [0001] The present invention relates to multiple-input multiple-output (MIMO) communication technology, in particular to a multi-user MIMO communication system, and a method and device for transmitting signals. Background technique [0002] For a communication system with multiple transmitting antennas, when transmitting different data to multiple users, they transmit at the same frequency and at the same time, which will inevitably cause mutual interference between multiple user data. Therefore, how to eliminate multiple user data The mutual interference among them is a technical problem to be solved in the multi-user communication system. The multi-user communication system includes a multi-user multiple input single output (MISO) communication system and a multi user multiple input multiple output (MIMO) communication system. [0003] In the multi-user MISO communication system, Tomlinson-Harashima Precoding (THP) is adopted. As a simple and feasible non...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L1/00H04B7/06
CPCH04B7/0465H04B7/0443
Inventor 杨绿溪许道峰李斌
Owner HUAWEI TECH CO LTD
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