Adaptive equalizer of Bluetooth 4.0 low-power receiver and implementation method of adaptive equalizer

Abstract

The invention relates to an adaptive equalizer of BT4.0 (Bluetooth 4.0) low-power receiver and an implementation method of the adaptive equalizer. A feed-forward equalizer (FFE) is connected with a decision device by a summator; the output end of the decision device is connected with a feed-backward equalizer (FBE); the input end of an error generator is connected with the input end and the output end of the decision device; the output end of the error generator is connected with the input end of a first tap coefficient updater and the input end of a second tap coefficient updater; the output end of the first tap coefficient updater is connected with the FFE; the output end of the second tap coefficient updater is connected with the FBE; the output end of the FBE is connected with the summator. The optimization and the improvement are made in the aspects of eliminating ISI (inter symbol interference) and tolerating symbol timing phase errors, and the ascertained ISI introduced by originating is eliminated by using a decision feedback equalizer of symbol intervals, and therefore, PER can be favorably reduced by a BT 4.0 signal receiving end, and the stability of the receiver is improved.

Description

technical field [0001] The invention relates to a bluetooth 4.0 low-power receiver adaptive equalizer and an implementation method thereof, belonging to the technical field of wireless local area network transmission. Background technique [0002] In December 2009, the Bluetooth Special Interest Group (SIG) launched the Bluetooth 4.0 version for the first time, and at the end of 2010, it officially announced the relevant data of the Bluetooth core specification version 4.0 in Seattle. Specifications include traditional Bluetooth technology, Bluetooth low-power technology and Bluetooth high-speed technology and other three specifications combined into one. [0003] Low power consumption technology can be said to be a major breakthrough in Bluetooth 4.0 version. It has ultra-low peak (Peak), average and standby power consumption. It can be used for several years through a standard button battery and supports compatibility between various devices. And enhance the range. Suppo...

AI Technical Summary

Problems solved by technology

Due to the existence of additive noise and the influence of inter-symbol interference (ISI) introduced by Gaussian filtering, it is easy to generate bit errors in the output bits generated by direct hard decision at this time, and at the same time, there will always be a certain error in the sampling phase obtained by symbol synchronization. , this phase further introduces intersymbol interference, and this intersymbol interference is unpredictable, so the existence of symbol synchronization phase error makes the output bit error performance of direct hard decision drop sharply, and these bit errors are not in the existing technology Opportunities not specifically eliminated and reduced

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