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Mitigation of transmission errors in multi antenna systems

An error and antenna technology, applied in the field of reducing transmission errors in multi-antenna systems, can solve problems such as feedback delay channel estimation errors

Inactive Publication Date: 2012-05-02
WI LAN INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is generally considered that all CSI is available in the receiver, but due to feedback delay and noise, channel estimation errors and limited feedback bandwidth, only part of the CSI may be available in the transmitter, which makes it necessary to quantize the CSI in the receiver with a minimum chemical feedback rate

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  • Mitigation of transmission errors in multi antenna systems
  • Mitigation of transmission errors in multi antenna systems
  • Mitigation of transmission errors in multi antenna systems

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Embodiment Construction

[0017] In a typical CSI vector quantizer (VQ), quantization of the channel vector space is performed as figure 1 Shown: The available space is filled with Voronoi regions 20 corresponding to centroids 22 representing all vector realizations in each Voronoi region. The number of such regions (centroids) is defined by the number of available bits, and each centroid is assigned an index 23 whose length in binary representation is equal to the number of available feedback bits. The indices can also be represented as any sequence of symbols, as long as each index is represented by a unique sequence of symbols and the symbols can be transmitted by the feedback channel. When the receiver transmits its channel state information to the transmitter, the bits (or symbols) representing the centroid index are physically transmitted on the feedback channel. When the term "binary index" is used, "sequence of symbols representing said index" can be substituted. When referring to the mapping...

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Abstract

Methods are disclosed for improving communications on feedback transmission channels, in which there is a possibility of bit errors. One method comprises the steps of choosing multiple mappings of indices to channel states, estimating the effect on transmission quality of feedback errors for each of the mappings of indices to channel states, selecting a mapping of indices to channel states to reduce the effect of feedback errors; and transmitting feedback of channel state information from the receiver to the transmitter, the receiver representing a channel state using the index determined by the selected mapping of indices to channel states.

Description

technical field [0001] Wireless communication using multiple antennas. Background technique [0002] The use of multiple antennas in fading channels is one of the most promising solutions for enhanced spectral efficiency in high-capacity wireless systems. The fundamental problem in such systems is the availability of channel state information (CSI) at the transmitter and receiver. It is generally considered that all CSI is available in the receiver, but due to feedback delay and noise, channel estimation errors and limited feedback bandwidth, only part of the CSI may be available in the transmitter, which makes it necessary to quantize the CSI in the receiver with a minimum Feedback rate. Contents of the invention [0003] A method for improving communication over a feedback transmission channel in which bit errors are likely to occur is disclosed. The basic solutions to counteract these errors are: proper design of CSI vector quantizer indices (e.g. bit representations...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04W16/00H04W24/00
CPCH04L1/0029H04L2025/03802H04B7/0619H04L1/0026H04B7/063H04B7/0656H04L2025/03426H04L25/0248H04B7/0652H04B7/0413H04L25/0204H04L25/03203H04B7/0417H04B7/0456H04L1/0042
Inventor 巴尔托什·米尔扎莱克维托尔德·A·克日米恩
Owner WI LAN INC