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Pre-coding method, system and device

A precoding and algorithm technology, applied in the field of precoding methods, systems and devices, can solve the problems of loss of signal transmission performance, impossible to completely eliminate modulo operation, signal interference, etc., and achieve the effect of reducing adverse effects

Inactive Publication Date: 2013-09-18
HUAWEI TECH CO LTD
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Problems solved by technology

However, this modulo offset will inevitably interfere with the signal. Even if the same modulo recovery operation as the modulo operation is performed on the received signal at the receiver side, due to feedback and unsatisfactory channel estimation as well as noise and interference effect, it is still not possible to completely remove the effect of the modulo operation, thus causing a performance penalty for signal transmission

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  • Pre-coding method, system and device

Examples

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no. 1 example

[0040] See image 3 , is a flow chart of the first embodiment of the precoding method at the transmitter side provided by the present invention, including:

[0041] In step S300, precoding preamble processing is performed on the signal to be transmitted, and the preamble processing increases the power of the signal to be transmitted. For example, preamble processing may include all processing steps in the precoding algorithm that may cause signal power increase, such as processing for serially eliminating interference between signal streams.

[0042] In step S301, a power limiting algorithm is selected according to a selection rule. For example, the selection rule includes: selecting a power limiting algorithm with the smallest performance loss, where the performance loss is the difference between the communication quality after the power limiting operation is performed and the communication quality when the power limiting operation is not performed. The selection rule may a...

no. 2 example

[0046] See Figure 4 , is a flow chart of the second embodiment of the precoding method at the transmitter side provided by the present invention, including:

[0047] In step S400, precoding preamble processing is performed on the signal to be transmitted, and the preamble processing increases the power of the signal to be transmitted. Taking ZF-THP as an example, assuming that the number of antennas at both ends of the transceiver is symmetrical, both are K, and the signal to be sent is a 1 , a 2 ,...,a K , the precoding preamble processing includes: obtain the channel matrix H according to the feedback of the receiver or obtain the approximate downlink channel matrix H according to the channel estimation of the uplink pilot, and decompose H to obtain H=LQ H , where L is a lower triangular matrix with dimension K×K, Q is a unitary matrix with dimension K×K, the decomposition can be done by H H Realization of QR decomposition, where H H Represent the conjugate transpositi...

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Abstract

The embodiment of the invention discloses a pre-coding method, which comprises the steps: performing pre-coding preorder processing on a signal to be transmitted, wherein the power of the signal to be transmitted is increased by the preorder processing; selecting a power limitation algorithm according to a selection rule; performing power limitation operation on the signal subjected to preorder processing according to the selected power limitation algorithm; and generating a pre-coded signal according to the signal after the power limitation operation. The embodiment of the invention also discloses a transmitter, a receiver and a pre-coding system. By using the pre-coding method, the transmitter, the receiver and the pre-coding system, the adverse effect of the power limitation operation on the signal transmission can be reduced as much as possible while the transmitting power is limited by using the power limitation operation.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a precoding method, system and device. Background technique [0002] MIMO (Multi-Input Multi-Output) technology can increase the capacity of wireless communication systems without increasing the transmission power, and has been widely used in LTE (Long Term Evolution, long-term evolution), WiMAX and other systems. Applications. [0003] Precoding is an important branch of MIMO technology, which can be regarded as a channel pre-equalization technology in essence. Preprocessing the data according to the channel information at the transmitter end can make the signal obtain a better signal-to-noise ratio after passing through the channel, and then obtain better performance at the receiver end. Commonly used precoding algorithms include linear and nonlinear. Among them, linear precoding means that precoding processing can be realized through linear operations, and the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06
CPCH04B7/0465Y02D30/70H03M7/00H04L1/00H04L1/0048
Inventor 贾明谭仕能陈磊
Owner HUAWEI TECH CO LTD
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