Channel estimation method and device based on array antenna

Abstract

A business form including a wristband is provided with a print area forming a badge, the badge having a length less than and a width greater than a width of either of two straps used to attach the wristband to the wrist, the badge thus having a greater print area to improve the readability of the indicia displayed therein. A business form including a wristband has a bulged rectangularly shaped print area to allow information to be printed transversely across the print area to improve readability of the indicia displayed in the print area. Thus, the bulged rectangularly shaped print area can accommodate one or both of bar codes printed thereon in ladder as well as picket fence fashion.; A security seal is disclosed which comprises a small, adhesive coated patch of laminate for sealing the joinder of the wristband ends and which has points of weakness such as X's die cut therein so that it separates or destructs upon removal to provide an indication of tampering with the wristband. Alsodisclosed is an embodiment of the wristband form that is imprinted with identifying indicia for collecting, tracking and administering a patient's blood collection and blood product compatibility.

Description

Technical field [0001] The present invention relates to mobile communication technology, in particular to an array antenna-based channel estimation technology. Background technique [0002] Many key technologies are involved in the mobile communication system, such as channel estimation technology, joint detection technology, smart antenna technology, etc. However, both the joint detection technology and the smart antenna technology are based on channel estimation, and the effect of channel estimation has an extremely important influence on the performance of joint detection. The multipath propagation of signals in the wireless mobile environment poses a severe challenge to channel estimation. How to obtain accurate channel estimation under harsh channel propagation conditions has become the key to affecting the quality of mobile communications. Therefore, reducing the error of channel estimation, that is, reducing or eliminating the noise in the channel response, is an urgent p...

AI Technical Summary

Problems solved by technology

However, the performance of Steiner estimation is affected by the additive noise at the receiving end. Compared with the ideal channel response, the obtained channel response contains noise components, that is, the channel estimation error; at the same time, it will also expand the noise power, resulting in signal noise at the output There is a certain amount of loss at the input terminal than the relative

[0004] To solve this problem, in the document "Improvement of low-cost channel estimation method in TD-SCDMA system" (Kang Shaoli, Qiu Zhengding, Li Shihe, Journal of Communications, Vol.23 No.10, 2002, 108-113.), proposed A noise reduction method for threshold detection. This method has a small amount of calculation and can improve the performance of the system. However, in the application of array antennas, the correlation between the elements of the array antenna cannot be effectively used. , there is still a lot of room for improvement in the performance of channel estimation

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