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Closed-loop adaptive transmission method for uplink of long term evolution advanced system

An adaptive transmission and evolutionary system technology, which is applied in the field of closed-loop adaptive transmission for the uplink of the advanced long-term evolution system, can solve problems such as the inability to know the channel state information, and achieve the effect of improving spectrum efficiency

Active Publication Date: 2011-12-07
SOUTHEAST UNIV
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Problems solved by technology

In a typical mobile communication environment, especially when the mobile terminal moves at a high speed, the channel changes rapidly, and it is impossible to know the complete channel state information

Method used

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  • Closed-loop adaptive transmission method for uplink of long term evolution advanced system
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  • Closed-loop adaptive transmission method for uplink of long term evolution advanced system

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specific Embodiment approach

[0084] The closed-loop adaptive transmission method for the uplink of the LTE-A system provided by the embodiment of the present invention can adapt to changes in the channel environment, and its system block diagram is as follows figure 1 shown. The specific implementation is as follows:

[0085] base station:

[0086] (1) Use the received pilot signal for channel estimation to obtain channel state information: frequency domain channel matrix and noise variance;

[0087] (2) Determine RI and PMI by using the joint selection method of rank and precoding;

[0088] (3) Determine the CQI by using the modulation and coding selection method;

[0089] (4) The link adaptation parameters RI, PMI and CQI calculated in (2) and (3) are transmitted to the mobile terminal through the feedback channel;

[0090] Mobile terminal:

[0091] (5) The mobile terminal receives the link adaptation parameter information from the feedback channel, determines the number of codewords and layers acc...

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Abstract

The invention discloses a closed-loop self-adaptive transmission method used for an uplink of an advanced long-term evolution system. According to the channel status information of the uplink, a mobile terminal selects an appropriate signal transmission mode for adapting to the change of channels. The closed-loop self-adaptive transmission method comprises the steps: a. a base station receives the signals transmitted by a multi-antenna channel, and carries out channel estimation on the received signals at a pilot frequency symbol to obtain link channel parameters in a transmission bandwidth; b. according to the obtained channel parameters, the base station carries out combined selection of ranks (the number of space division multiplexing layers) and precoded matrixes based on the mutual information amount performance criteria, and then carries out modulation coding mode selection according to the mean signal-to-noise ratio mapping criteria, and finally sends the sequence numbers of the selected rank instructions (RI) and the precoded matrixes in a codebook, namely precoded matrix instructions (PMI) and channel quality instructions (CQI) corresponding to the selected modulation coding modes to a feedback channel; and c. the mobile terminal carries out self-adaptive transmission by utilizing the parameters such as RIs, PMIs and CQIs obtained by the feedback channel.

Description

technical field [0001] The present invention relates to an advanced long-term evolution (LTE-Advanced, LTE-A for short) system, and in particular to an adaptive transmission method for the uplink of the system under different channel states. Background technique [0002] As a candidate technology for 4G, LTE-A is a smooth evolution based on the LTE core technology and is backward compatible with LTE. The main performance index of LTE-A is to provide a peak rate of 1Gbps downlink and 500Mbps uplink under a bandwidth of 100MHZ, which can effectively support the application of new frequency bands and large bandwidths, greatly increase the peak rate, and effectively improve the spectral efficiency. In order to improve the peak spectrum efficiency and average spectrum efficiency in the LTE-A system, the maximum number of antennas supported by transmission / reception has been expanded on both the uplink and downlink, allowing uplink transmission with up to 4 antennas and 4 layers, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04L1/16
Inventor 金石陈文石江彬姜帆高西奇尤肖虎
Owner SOUTHEAST UNIV
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