Space-time codes with incremental redundancy
A space-time code and symbol technology, applied in the field of space-time code-assisted incremental redundancy, can solve problems such as difficult to use incremental redundancy to send signals, unknown incremental redundancy scheme, etc.
Inactive Publication Date: 2014-09-03
APPLE INC
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Problems solved by technology
However, incremental redundancy schemes are unknown for transmission with multiple antennas
This is partly because in a space-time channel, signals sent from different antennas are superimposed, which makes it difficult to exploit incremental redundancy to improve the transmitted signal
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[0051] The examples set forth below give the necessary information to enable those skilled in the art to practice the invention and illustrate the preferred modes of carrying out the invention. Upon reading the following description with reference to the accompanying drawing figures, those skilled in the art will understand the concepts of the invention and recognize applications of these concepts not specifically addressed herein. It should be clear that these concepts and applications fall within the scope of the present disclosure and the appended claims.
[0052] The present invention relates to space-time coding techniques that combine space and time diversity to provide incremental redundancy in a wireless communication environment. In general, a transmitter sends packets to a receiver in blocks of symbols with high bandwidth efficiency, and only when a data packet is incorrectly received by the receiver, the transmitter sends additional symbols to assist in decoding the...
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The present invention relates to space-time coding techniques capable of providing incremental redundancy in wireless communication environments incorporating spatial and temporal diversity. In general, a transmitter sends packets, via blocks of symbols, to a receiver with high bandwidth efficiency and only in the event that the receiver does not correctly receive a data packet does the transmitter send additional symbols to assist with the decoding of the incorrectly received packet. A hybrid ARQ feedback mechanism is used such that the receiver can inform the transmitter whether the packets were correctly or incorrectly received. From the feedback, the transmitter can determine whether to send new symbols or initiate incremental redundancy. By combining the received words corresponding to the redundant symbols and those of the original packet transmission, additional diversity, coding gain, signal energy, or a combination thereof are provided to the receiver and are used to correctly decode the transmitted data.
Description
[0001] This application is a divisional application of the invention patent application 03825185.X filed on July 7, 2003, entitled "Space-Time Code with Incremental Redundancy". technical field [0002] The present invention relates to wireless communications, and more particularly to the use of space-time codes to assist incremental redundancy in a space-diversity communications environment. Background technique [0003] In recent years, the demand for wireless data services has exploded, and the evolution from wireless voice to wireless data has caused an exponential increase in the demand for wireless capacity. Since there are already more than one billion subscribers worldwide, it is expected that subscriptions to wireless services will surpass subscriptions to wireline services by 2005. This has forced wireless service providers and equipment suppliers to seek ways to increase the data rate of wireless systems, thus prompting a large number of institutions to study this...
Claims
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IPC IPC(8): H04L1/06H04L1/18
CPCH04L1/1893H04L1/1845H04L1/1841H04L1/1816H04L1/1819H04L1/0625H04L1/06H04L1/18
Inventor V·塔罗克M·贾W·童P·朱J·马
Owner APPLE INC