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Finding channel state information with reduced codebook in a multi-antenna wireless communication system

A wireless communication system, channel state information technology, applied in diversity/multi-antenna systems, radio transmission systems, transmission systems, etc., can solve problems such as the difficulty in implementing conventional methods for providing feedback to improve performance

Active Publication Date: 2015-06-24
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes it difficult to implement conventional methods of providing feedback to improve performance

Method used

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  • Finding channel state information with reduced codebook in a multi-antenna wireless communication system
  • Finding channel state information with reduced codebook in a multi-antenna wireless communication system
  • Finding channel state information with reduced codebook in a multi-antenna wireless communication system

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Embodiment Construction

[0031] Specific details, such as specific architectures, interfaces, techniques, etc., are set forth for purposes of illustration and not limitation. It will be apparent, however, to one skilled in the art that the techniques described herein may be practiced in other embodiments that depart from these specific details. That is, those skilled in the art will be able to devise various arrangements which embody the principles of the described technology although not explicitly described or shown herein.

[0032] In some instances, detailed descriptions of well-known devices, circuits, and methods are omitted so as not to obscure the description with unnecessary detail. All statements herein reciting principles, aspects, embodiments, and examples are intended to encompass both structural and functional equivalents. Additionally, it is intended that such equivalents include both currently known equivalents as well as equivalents developed in the future, ie, any elements developed...

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Abstract

Multiple antennas employed at the transmitter (110) and receiver (120) can significantly increase a MIMO system (100) capacity, especially when channel knowledge is available at the transmitter (110). Channel state information may be provided to the transmitter (110) by the receiver (120) in a codebook based precoding feedback. In a proposed approach is proposed in which the receiver (120) conducts a search of precoder elements of a codebook to provide the transmitter (110) with rank information and precoder control index that enhances capacity. Unlike the conventional exhaustive search, the proposed approach reduces complexity by reducing the search space of precoder elements for consideration. Performance loss is minimized by reducing the search space of higher rank precoder elements. For some ranks, the complexity is reduced without any performance sacrifice by grouping the precoder elements of the rank into groups of equivalent capacities and including at most one precoder element from each group into the search space.

Description

[0001] related application [0002] This application claims priority and benefit to U.S. Application 13 / 610,319, filed September 11, 2012, entitled "FINDING CHANNEL STATE INFORMATION WITH REDUCED CODEBOOK IN A MULTI-ANTENNA WIRELESS COMMUNICATION SYSTEM," and also claims Priority and Benefit of U.S. Application 13 / 748,212, FINDING CHANNEL STATE INFORMATION WITH REDUCED CODEBOOK IN A MULTI-ANTENNA WIRELESS COMMUNICATION SYSTEM, filed January 23, both of which are incorporated by reference in their entirety here. Background technique [0003] The use of multiple antennas at the transmitter and receiver can greatly increase system capacity. By transmitting independent symbol streams with the same frequency bandwidth, commonly referred to as spatial multiplexing (SM), a linear increase in data rate is achieved with an increasing number of antennas. On the other hand, by using space-time codes at the transmitter, the reliability of the detected symbols can be improved by exploit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B7/06
CPCH04B7/0417H04B7/0478H04B7/0486H04B7/063
Inventor S·纳米
Owner TELEFON AB LM ERICSSON (PUBL)
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