US 2024/0291694 A1Published application

Method and apparatus for determining symbols transmitted via orthogonal frequency division multiplex signals

AssigneesContinental Automotive Technologies GmbH, Nanyang Technological University

InventorsXiaobei Liu, Yujie Liu, Yong Liang Guan, David Gonzalez Gonzalez

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Abstract

An OFDM receiver has a first, pilot-aided channel estimation block, an output of which is provided, along with the received signal, to a first equaliser block. An output of the first equaliser block is provided, along with the received signal, to a second, data-aided channel estimation block. An output of the second channel estimation block is provided, along with the output of the first equaliser block and the received signal, to an adjustable interference cancellation block. The output of the interference cancellation block and the output of the second channel estimation block are provided to a second equaliser block. An output of the second equaliser block is provided to a de-mapping block, and is provided to the second channel estimation block and the interference cancellation block, for allowing an iterative repetition of second channel estimation, interference cancellation and second equalisation for a received signal.

A method of determining symbols transmitted in a transmission block (S[k]) over a wireless channel using orthogonal frequency division multiplex, the transmission block (S[k]) comprising at least one data sub-block and at least one pilot sub-block, the method comprising:

a) receiving, in the frequency domain, a transmission block (Y[k]) transmitted via the OFDM transmission channel,
b) performing a pilot-aided first channel estimation function on the received transmission block (Y[k]),
c) providing the received transmission block (Y[k]) and the output (ĥq(/)1) of the pilot-aided first channel estimation function to a first channel equalisation function, wherein an output of the first channel equalisation function is a set of first-iteration estimated symbols (Ŝ[k]1),
d) providing the received transmission block (Y[k]) and the set of first-iteration estimated symbols (Ŝ[k]1) to a data-aided second channel estimation function,
e) providing the received transmission block (Y[k]), the set of first-iteration estimated symbols (Ŝ[k]1) and the output (ĥq(/)i) of the data-aided second channel estimation function to an adjustable interference cancellation function,
f) providing the output (ĥq(/)i) of the data-aided second channel estimation function and the output (Y′[k]) of the adjustable interference cancellation function to a second equaliser function, wherein an output of the second equaliser function is a set of i-th-iteration estimated symbols (Ŝ[k]i), i being larger than 1, wherein each set of i-th-iteration estimated symbols (Ŝ[k]i) may include the set of the estimated symbols (Ŝ[k]i-1) from the previous iteration as a subset,
g) repeating steps e) and f), wherein the received transmission block (Y[k]) and the i-th-iteration set of estimated symbols (Ŝ[k]i) is iteratively provided to the data-aided second channel estimation function and the adjustable interference cancellation function, respectively, until a predetermined termination condition is fulfilled.

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Facts

Application

18/571,425Filed 20 Jun 2022

Priority

DE 10 2021 116 549.025 Jun 2021

Published

29 Aug 2024

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04L 25/0236
With extension to other symbols: using estimation of the other symbols
H04L 25/03292
Arrangements for operating in conjunction with other apparatus: with channel estimation circuitry
H04L 25/03305
Arrangements involving sequence estimation techniques: joint sequence estimation and interference removal
H04L 25/03821
Arrangements for removing intersymbol interference: inter-carrier interference cancellation [ICI]

Abstract

Claims13