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Reduced state sequence estimator using multi-dimensional set partitioning

An estimator and sequence technology, applied in the field of state-reduced sequence estimation, can solve problems such as large delay expansion, and achieve the effect of improving performance and reducing problems related to error propagation.

Inactive Publication Date: 2007-09-19
NOKIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There may be a large delay spread on the channel

Method used

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  • Reduced state sequence estimator using multi-dimensional set partitioning
  • Reduced state sequence estimator using multi-dimensional set partitioning
  • Reduced state sequence estimator using multi-dimensional set partitioning

Examples

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Embodiment Construction

[0031] Referring first to FIG. 1 , an exemplary communication system, shown generally at 10 , provides data transfer between a set of communication stations, here a sending station 12 and a receiving station 14 . The sending and receiving stations are interconnected via channel 16 .

[0032]In an exemplary implementation, the communication system 10 forms a non-orthogonal-OFDM (Orthogonal Frequency Division Multiplexing) communication system in which the channel 16 is formed by subcarriers of a set of subcarriers having a selected carrier frequency. The sub-carriers are non-orthogonal with respect to each other and each sub-carrier defines a channel through which a sequence of data (eg, a data frame formed of data symbols) is transmitted. Although the following description will describe the operation of one embodiment of the invention with respect to its implementation in a communication system 10 forming an N-OFDM communication system, such as proposed for use in a fourth gen...

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Abstract

A reduced state sequence estimator, and associated method, for equalizing data symbols communicated during operation of a communication system. The estimator is formed of multi-dimensional states of groups of symbols that are combined over more than one dimension to the multi-dimensional. Once the groups of symbols are formed, the groups are partitioned into partition sets. Equalization operations are performed over multiple time epochs of the trellis formed of the partitioned groups of symbols over multiple time epochs.

Description

technical field [0001] The present invention generally relates to a way to perform sequence estimation with reduced states using multidimensional set partitioning. More specifically, the present invention relates to apparatus and associated methods for estimating the value of data symbols of a data sequence received at a communication station, such as an N-OFDM (Non-OFDM) that does not use a cyclic prefix. Orthogonal Frequency Division Multiplexing) communication station in the system. [0002] By using reduced-state sequence estimation with a grid formed by multidimensional set partitioning, the equalization operation to estimate the value of the transmitted data symbols exhibits a desired level of performance relative to conventional reduced-state sequence estimation procedures and at a reduced level of complexity. Equalization is performed on received data symbols transmitted in a spectrally efficient manner, such as without using a cyclic prefix, while maintaining an acc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
CPCH04L25/03229
Inventor T·里德
Owner NOKIA CORP
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