Method of estimating signal-to-noise ratio, method of adjusting feedback information transmission, adaptive modulation and coding method using the same, and transceiver thereof
A technology of adaptive modulation and coding method, which is applied in the direction of adjusting channel coding, adjusting transmission rate, and modifying transmission based on link quality. , enhance system performance, reduce the effect of difference
Inactive Publication Date: 2012-11-21
LG ELECTRONICS INC
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[0011] Moreover, even if the channel or the user's moving speed is significantly changed, the related technical solution cannot receive feedback information unless a specified cycle is reached
Therefore, using the previous feedback information will cause the system performance to degrade
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[0057] Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.
[0058] First of all, the following techniques can be applied to various communication systems. Such communication systems are widely deployed to provide various communication services including audio, packet data, and others.
[0059] This technique can be used for downlink and / or uplink. Downlink refers to communication from a base station (hereinafter abbreviated as BS) to a mobile station (hereinafter abbreviated as MS), and uplink refers to communication from a mobile station (MS) to a base station (BS).
[0060] A base station generally refers to a fixed station used to communicate with mobile stations. And, a base station can be called a term such as Node-B, BTS (Base Transceiver System), Access Point, and the like.
[0061] A mobile station is fixed or mobile and can be referred to by terms such as User Equipment...
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A method of estimating a signal-to-noise ratio by considering user mobility, a method of adjusting feedback information transmission, an adaptive modulation and coding method using the same, and a transceiver thereof are disclosed. The present invention includes measuring a first channel parameter and a second channel parameter using first and second symbols sequentially received, respectively, estimating a channel quality considering a time delay between measurements of the first and second channel parameters using the first and second channel parameters, and transmitting information for theestimated channel quality if a variation of the first and second channel parameters is equal to or greater than a prescribed threshold. Accordingly, the present invention reduces performance degradation and feedback overhead caused by a time delay in channel quality estimation.
Description
technical field [0001] The present invention relates to an adaptive modulation and coding method, and more particularly to a method of estimating the signal-to-noise ratio by taking user mobility into account, a method of adjusting the transmission of feedback information, an adaptive Modulation and coding methods, and their transceivers. Background technique [0002] Generally, one of the contents included in the standards of the third generation wireless mobile communication system is an Adaptive Modulation and Coding (AMC) scheme. To this end, you can refer to 3GPP TR 25.848 V4.0.0 (2001-03) "3rd Generation Partnership Project; Physical layer aspects of UTRA High Speed Downlink Packet Access (3rd generation cooperation project; physical layer aspects of UTRA high speed downlink packet access) )” (available from http: / / www.3gpp.org). [0003] The AMC scheme is a scheme for dynamically changing a modulation and coding scheme (MCS) according to a channel state. Typicall...
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IPC IPC(8): H04L27/26
CPCH04L1/0003H04L1/0009H04L1/20H04L25/0202
Inventor 崔镇洙吴旼锡赵基亨姜承显文诚颢郑载薰朴亨镐成斗铉
Owner LG ELECTRONICS INC