System and method for RF signal combining and adaptive bit loading for data rate maximization in multi-antenna communication systems

A bit-loading, self-adaptive technology, applied in the field of communication systems

Inactive Publication Date: 2006-08-16
BROADCOM CORP
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Problems solved by technology

[0011] However, the above-mentioned method of computing spatial weights using closed-form expressions independent of the bit-loading parameters does not apply to the situation described in the above-referenced non-provisional patent application, that is, signal weighting can only be performed in the RF domain or between the RF domain and baseband The case where the domain executes in both

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  • System and method for RF signal combining and adaptive bit loading for data rate maximization in multi-antenna communication systems
  • System and method for RF signal combining and adaptive bit loading for data rate maximization in multi-antenna communication systems
  • System and method for RF signal combining and adaptive bit loading for data rate maximization in multi-antenna communication systems

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[0024] As will be discussed below, the present invention provides a weighted combining method based on the maximum data rate for multi-antenna systems including N-fold spatial multiplexing multi-antenna systems for reducing the transmitted signal energy The subcarriers perform adaptive bit loading. In order to facilitate the understanding of the principles of the present invention, the following will first roughly introduce a typical structure for implementing weighted combining in such a multi-antenna system. The weight generation method of the present invention will be described in detail later, and the weight generation method can be applied to the weighted combination method of the present invention.

[0025] I. Overview of RF Weighted Merging Structure

[0026] The above-referenced pending non-provisional patent application discloses a method and apparatus for use in a wireless communication system that allows the use of a number of RF chain. In a typical implementatio...

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Abstract

A system and method for generating weight values based on maximum data rate for weighting elements included within signal weighting and combining arrangements used in various multi-antenna transmitter and receiver structures is disclosed herein. Weighting values for a given signal combining arrangement are set so as to maximize an output data rate of the applicable multi-antenna system in the presence of adaptive bit loading of the subcarriers of a transmitted signal. The disclosed techniques may be employed to maximize a data rate of a multi-antenna communication system by using adaptive bitloading and RF and baseband weighting schemes. In this case a search is conducted over various combinations of RF and baseband weights in order to find the weight combination which, when adaptive bitloading is also employed, maximizes the data rate.

Description

technical field [0001] The present invention relates to communication systems using transmitters and receivers with multiple antenna elements. More specifically, the present invention relates to a data rate maximization method using adaptive bit loading and weighted combining of radio frequency signals, either without or in combination with weighted combining of baseband signals and using multiple antenna transmitters and receivers Send and receive signals. Background technique [0002] Most current wireless communication systems consist of multiple nodes configured with a single transmit and receive antenna. However, there are indications that the performance, including capacity, of wide-range wireless communication systems can be substantially improved by using multiple transmit and / or multiple receive antennas. Such configurations form the basis of many so-called "smart" antenna technologies. This technique, combined with spatio-temporal signal processing, can be used ...

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Application Information

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IPC IPC(8): H04K1/10H04L27/28H01QH04B7/06H04L1/00H04L27/26
CPCH04B7/0615H04L5/0046H04L1/0003H04B7/0613H04L5/006H04L1/0009H04L5/0023
Inventor 塞韦林·卡特罗伊斯文科·厄斯戈皮特·W·鲁皮特·范鲁延杰克·温特斯
Owner BROADCOM CORP
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