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Receiver and method for two-stage equalization with sequential tree search

A sequential search and receiver technology, applied in the field of receivers, can solve problems such as performance impact

Inactive Publication Date: 2012-05-16
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is unlikely to have a large impact on performance

Method used

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  • Receiver and method for two-stage equalization with sequential tree search
  • Receiver and method for two-stage equalization with sequential tree search
  • Receiver and method for two-stage equalization with sequential tree search

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Embodiment Construction

[0104] refer to Figure 5 , which shows the basic diagram of a receiver 500 with a two-stage equalizer 502 configured in accordance with the present invention. The two-stage equalizer 502 includes a first stage 504 and a second stage 506 that reduce ISI in a received signal 508 . The first stage 504 can be a relatively simple form of demodulation such as a linear receiver, for example having a matched filter, a zero-forcing filter, a chip equalizer that processes the received signal 508 and produces information 510 for use in the second stage 506 , RAKE, GRAKE or their variants. Alternatively, the first stage can also be non-linear, like a decision feedback equalizer. The second stage 506 is capable of implementing a modified sequential search or decoding method, such as a modified stack search structure, which again processes the received signal 508 and incorporates information 510 from the first stage 504 to speed up and possibly limit or improve its search, to output mor...

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Abstract

A receiver (500) and a method are described herein that address inter-symbol interference in a received signal (508) by using a two-stage equalizer (502) which includes a first demodulation stage (504) that processes the received signal and produces initial symbol decisions (510), and a non-linear equalization second stage (506) that uses the received signal to perform a sequential search in an attempt to improve upon the initial symbol decisions; wherein, if able to improve upon the initial symbol decisions then an output sequence (512) is obtained from the sequential search and if not able to improve upon the sequence metric threshold then the output sequence is the initial symbol decisions.

Description

technical field [0001] The present invention relates generally to the field of wireless telecommunications, and in particular to a receiver for mitigating inter-symbol interference in received symbols by using a two-stage equalizer with sequential search. Background technique [0002] The following acronyms are defined herein, at least some of which are referred to in the ensuing State of the Art and Description of the Invention. References to "the present invention" or "invention" as used herein refer to the exemplary embodiments and not necessarily to every embodiment covered by the appended claims. [0003] [0004] [0005] Cellular communication systems are now evolving to have higher data rates. For example, HSPA communication systems provide higher data rates in both uplink and downlink by using higher order signal constellations to transmit more bits in the same time. The same is true for LTE uplink. However, when the channel between the transmitter and rece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
CPCH04L25/03178H04B7/005H04L25/03H04L27/01
Inventor A·S·海拉拉G·E·博顿利
Owner TELEFON AB LM ERICSSON (PUBL)
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