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Lower bound establishing method for multi-antenna channel characteristic parameter joint estimation

A technique for channel characteristics and joint estimation, applied in diversity/multi-antenna systems, space transmit diversity, and error prevention/detection through diversity reception, which can solve problems such as few estimation lower bounds and lack of multi-antenna channels.

Inactive Publication Date: 2014-12-10
SHANGHAI NORMAL UNIVERSITY
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Problems solved by technology

[0004] At present, there are many studies on the estimated lower bounds of the time-invariant characteristic parameters of the centralized MIMO system, but the multi-antenna wireless channel is a typical time-varying channel, and there are few estimated lower bounds for the time-varying characteristic parameters, and there is still a lack of multi-antenna channels including Estimation lower bounds of three types of time-varying characteristic parameters: fading, time delay and frequency offset caused by Doppler shift

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  • Lower bound establishing method for multi-antenna channel characteristic parameter joint estimation
  • Lower bound establishing method for multi-antenna channel characteristic parameter joint estimation
  • Lower bound establishing method for multi-antenna channel characteristic parameter joint estimation

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[0021] Below in conjunction with accompanying drawing and embodiment the present invention will be further described

[0022] This embodiment is implemented on the premise of the technical solution of the present invention, and specific implementation methods and specific operation processes are provided, but the protection scope of the present invention is not limited to the following examples.

[0023] In the embodiment, the multi-antenna system channel model with time-varying characteristic parameters (as attached figure 1 shown), the present invention adopts the multi-antenna system of 2 sending 2 receiving, and the signal to be transmitted is that S=[S 1 , S 2 ], using the Hada code matrix to ensure that S 1 and S 2 Mutual orthogonality at any time, the total power of the transmitted signal is W, W=10^(SNR / 10), and the transmission power of each antenna adopts an even allocation scheme.

[0024] Such as figure 1 As shown, the establishment method of the lower bound o...

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Abstract

The invention relates to a lower bound establishing method for multi-antenna channel characteristic parameter joint estimation, which relates to the technical field of wireless communication and parameter estimation. A lower bound can be used as an evaluation index when an estimation value and an estimation variance of time-variable channel characteristic parameters such as channel attenuation, time delay and frequency bias are obtained by adopting an estimation method for a multi-antenna channel. The method comprises the steps of initializing a parameter to be estimated and an estimation variance of the parameter; deducing a one-step status transfer probability density function and an observation likelihood function according to a channel characteristic parameter model; and utilizing a recursion way to obtain a Fisher information matrix, and obtaining a Cramer-Rao lower bound after inverting the Fisher information matrix.

Description

technical field [0001] The present invention relates to the technical field of receiver design for wireless communication systems, specifically for the current time-varying multi-antenna channel, combined with the Cramer-Rao Lower Bound (CRLB) formula obtained in a recursive manner in nonlinear filtering theory, the channel time provided The estimated lower bound of variable parameter joint acquisition can provide reference for receiver design. Background technique [0002] Obtaining channel state information (CSI) at the receiving end of a multi-antenna system, that is, a multiple input multiple output (MIMO, Multiple Input Multiple Output) system, and then demodulating the transmitted signal correctly can greatly improve the performance of the receiver. Especially after adopting the distributed antenna configuration, it can overcome the problem that the centralized multi-antenna system faces with large antenna spacing and difficult to arrange at the receiving end. Since t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04B7/08H04B7/04
Inventor 张静顾夏珺钱栋军石丹凤
Owner SHANGHAI NORMAL UNIVERSITY
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