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Self-adaption transmission method utilizing channel statistical information in multi-base station cooperative transmission system

A technology of adaptive transmission and channel statistics, applied in the direction of transmission system, digital transmission system, baseband system components, etc., can solve the problems of time-varying frequency offset of wireless channel, difficulty in obtaining channel state information at the sending end, etc.

Active Publication Date: 2010-11-24
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the time-varying nature of the wireless channel, the delay of channel estimation and feedback, and the offset of frequency make it difficult to obtain complete channel state information at the sending end.

Method used

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  • Self-adaption transmission method utilizing channel statistical information in multi-base station cooperative transmission system
  • Self-adaption transmission method utilizing channel statistical information in multi-base station cooperative transmission system
  • Self-adaption transmission method utilizing channel statistical information in multi-base station cooperative transmission system

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specific Embodiment approach

[0078] Receiving end:

[0079] 1) If the implicit feedback mode is adopted, calculate the received signal-to-noise ratio γ, feed back the received signal-to-noise ratio γ to each base station at the transmitting end, and skip to step 6); otherwise, proceed to step 2).

[0080] 2), use the received signal to perform channel estimation, calculate the received signal-to-noise ratio γ, and use formula (4) and formula (5) to calculate the transmit correlation matrix R ti (i=1, 2,..., m) and receiving correlation matrix R r .

[0081] 3), perform eigendecomposition on the sending correlation matrix and the receiving correlation matrix to obtain U ti (i=1, 2, ..., m) and U r .

[0082] 4), using the result of eigendecomposition U ti (i=1, 2, ..., m), U r and formula (8) to calculate the channel coupling matrix Ω i (i=1, 2, . . . , m).

[0083] 5), the R ti ,Ω i (i=1, 2, . . . , m) and γ are fed back to each base station at the sending end, and enter step 9). Each base stat...

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Abstract

The embodiment of the invention discloses a self-adaption transmission method utilizing channel statistical information in a multi-base station cooperative transmission system, comprising the following steps of: calculating the channel statistical information between each base station and a user by utilizing the results estimated by channels, wherein the channel statistical information includes a channel coupled matrix on a characteristic mode, a transmitting correlation matrix and a receiving signal to noise ratio and can be obtained at a receiving end; and carrying out combined power distribution and combined precoding transmission among the base stations by each base station at a transmitting end according to the channel statistical information fed back or hiddenly fed back by the receiving end. The self-adaption transmission method in the multi-base station cooperative transmission system in the invention can adjust transmitted parameters according to the statistical properties of the channels and improve the frequency spectrum utilization rate and the power efficiency of a communication system, and the obtained mutual information amount approaches to the capacities of the channels.

Description

technical field [0001] The present invention relates to a mobile communication system for transmitting high-speed data by using multi-base station cooperation, in particular to an adaptive transmission method in the multi-base station cooperation system using channel statistical information. Background technique [0002] In order to meet the needs of future development, the last three generations (B3G) or the fourth generation (4G) mobile communication system is required to be able to support high-speed packet data transmission of tens of megabits per second or even gigabits per second. Under the circumstances, multiple antenna transmission and multiple antenna reception (MIMO) wireless reception technology has been widely used, but in the actual cellular system, due to the co-channel interference caused by the frequency reuse of adjacent cells, as well as the spatial fading correlation and direct path, These factors directly lead to the fact that the actual MIMO system is d...

Claims

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Application Information

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IPC IPC(8): H04W24/02H04W72/04H04L25/02H04L1/00
CPCY02B60/50Y02D30/70
Inventor 高西奇张军江彬金石
Owner HUAWEI TECH CO LTD
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