Codeword metric calculation scheme for outer code in overloaded MIMO-OFDM system

Yoshihito Doi, Yukitoshi Sanada

Research output: Contribution to journalArticle

Abstract

This paper presents a codeword metric calculation scheme for two step joint decoding of block coded signals in overloaded multipleinput multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. A two step joint decoding scheme has been proposed for the complexity reduction as compared to joint maximum likelihood decoding in overloaded MIMO systems. Outer codes are widely used in wireless LANs such as IEEE802.11n. However, the two step joint decoding has not been combined with an outer code. In the first step of the two step joint decoding candidate codewords for metric calculation in the second step are selected. The selection of the candidate codewords in the inner block code may not always be able to provide the metric of a binary coded symbol for the outer code. Moreover, a bit flipping based codeword selection scheme in the two step joint decoding may not always provide the second best candidate codeword. Thus, in the proposed scheme the metric of the binary coded symbol calculated in the first step is reused in the second step of two step joint decoding. It is shown that the two step joint decoding with the proposed metric calculation scheme achieves better performance than that of the joint decoding with the bit flipping based codeword calculation scheme and reduces the complexity by about 0.013 for 4 signal streams with the cost of bit error rate degradation within 0.5 dB.

Original languageEnglish
Pages (from-to)1598-1605
Number of pages8
JournalIEICE Transactions on Communications
VolumeE98B
Issue number8
DOIs
Publication statusPublished - 2015 Aug 1

Fingerprint

Orthogonal frequency division multiplexing
Decoding
Block codes
Local area networks
Bit error rate
Maximum likelihood
Degradation
Costs

Keywords

  • Joint maximum likelihood decoding
  • Multiple-input multiple-output (MIMO)
  • Overloaded MIMO

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications
  • Software

Cite this

Codeword metric calculation scheme for outer code in overloaded MIMO-OFDM system. / Doi, Yoshihito; Sanada, Yukitoshi.

In: IEICE Transactions on Communications, Vol. E98B, No. 8, 01.08.2015, p. 1598-1605.

Research output: Contribution to journalArticle

@article{8ebd17c9d2374f48a118aad5cdc0c83b,
title = "Codeword metric calculation scheme for outer code in overloaded MIMO-OFDM system",
abstract = "This paper presents a codeword metric calculation scheme for two step joint decoding of block coded signals in overloaded multipleinput multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. A two step joint decoding scheme has been proposed for the complexity reduction as compared to joint maximum likelihood decoding in overloaded MIMO systems. Outer codes are widely used in wireless LANs such as IEEE802.11n. However, the two step joint decoding has not been combined with an outer code. In the first step of the two step joint decoding candidate codewords for metric calculation in the second step are selected. The selection of the candidate codewords in the inner block code may not always be able to provide the metric of a binary coded symbol for the outer code. Moreover, a bit flipping based codeword selection scheme in the two step joint decoding may not always provide the second best candidate codeword. Thus, in the proposed scheme the metric of the binary coded symbol calculated in the first step is reused in the second step of two step joint decoding. It is shown that the two step joint decoding with the proposed metric calculation scheme achieves better performance than that of the joint decoding with the bit flipping based codeword calculation scheme and reduces the complexity by about 0.013 for 4 signal streams with the cost of bit error rate degradation within 0.5 dB.",
keywords = "Joint maximum likelihood decoding, Multiple-input multiple-output (MIMO), Overloaded MIMO",
author = "Yoshihito Doi and Yukitoshi Sanada",
year = "2015",
month = "8",
day = "1",
doi = "10.1587/transcom.E98.B.1598",
language = "English",
volume = "E98B",
pages = "1598--1605",
journal = "IEICE Transactions on Communications",
issn = "0916-8516",
publisher = "Maruzen Co., Ltd/Maruzen Kabushikikaisha",
number = "8",

}

TY - JOUR

T1 - Codeword metric calculation scheme for outer code in overloaded MIMO-OFDM system

AU - Doi, Yoshihito

AU - Sanada, Yukitoshi

PY - 2015/8/1

Y1 - 2015/8/1

N2 - This paper presents a codeword metric calculation scheme for two step joint decoding of block coded signals in overloaded multipleinput multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. A two step joint decoding scheme has been proposed for the complexity reduction as compared to joint maximum likelihood decoding in overloaded MIMO systems. Outer codes are widely used in wireless LANs such as IEEE802.11n. However, the two step joint decoding has not been combined with an outer code. In the first step of the two step joint decoding candidate codewords for metric calculation in the second step are selected. The selection of the candidate codewords in the inner block code may not always be able to provide the metric of a binary coded symbol for the outer code. Moreover, a bit flipping based codeword selection scheme in the two step joint decoding may not always provide the second best candidate codeword. Thus, in the proposed scheme the metric of the binary coded symbol calculated in the first step is reused in the second step of two step joint decoding. It is shown that the two step joint decoding with the proposed metric calculation scheme achieves better performance than that of the joint decoding with the bit flipping based codeword calculation scheme and reduces the complexity by about 0.013 for 4 signal streams with the cost of bit error rate degradation within 0.5 dB.

AB - This paper presents a codeword metric calculation scheme for two step joint decoding of block coded signals in overloaded multipleinput multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. A two step joint decoding scheme has been proposed for the complexity reduction as compared to joint maximum likelihood decoding in overloaded MIMO systems. Outer codes are widely used in wireless LANs such as IEEE802.11n. However, the two step joint decoding has not been combined with an outer code. In the first step of the two step joint decoding candidate codewords for metric calculation in the second step are selected. The selection of the candidate codewords in the inner block code may not always be able to provide the metric of a binary coded symbol for the outer code. Moreover, a bit flipping based codeword selection scheme in the two step joint decoding may not always provide the second best candidate codeword. Thus, in the proposed scheme the metric of the binary coded symbol calculated in the first step is reused in the second step of two step joint decoding. It is shown that the two step joint decoding with the proposed metric calculation scheme achieves better performance than that of the joint decoding with the bit flipping based codeword calculation scheme and reduces the complexity by about 0.013 for 4 signal streams with the cost of bit error rate degradation within 0.5 dB.

KW - Joint maximum likelihood decoding

KW - Multiple-input multiple-output (MIMO)

KW - Overloaded MIMO

UR - http://www.scopus.com/inward/record.url?scp=84938832403&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84938832403&partnerID=8YFLogxK

U2 - 10.1587/transcom.E98.B.1598

DO - 10.1587/transcom.E98.B.1598

M3 - Article

AN - SCOPUS:84938832403

VL - E98B

SP - 1598

EP - 1605

JO - IEICE Transactions on Communications

JF - IEICE Transactions on Communications

SN - 0916-8516

IS - 8

ER -