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Performance analysis of repetition-coding and space-time-block-coding as transmitter diversity schemes for indoor optical wireless Communications

Performance analysis of repetition-coding and space-time-block-coding as transmitter diversity schemes for indoor optical wireless Communications
Performance analysis of repetition-coding and space-time-block-coding as transmitter diversity schemes for indoor optical wireless Communications

The benefits of 2 × 1 multiple-inputs-single-output scheme for transmitter diversity in the infrared indoor optical wireless communication link are theoretically investigated. The performance of repetition-coding (RC) and Alamouti-type real-valued space-time-block-coding (STBC) as effective transmitter diversity schemes is systematically compared under conditions of channel gain variation caused by the degradation in the received optical power due to the blocking of one optical beam of the optical wireless channel. It is shown that the linear addition of channel gains in the RC scheme outperforms the root-sum-square of channel gains in the STBC scheme with regards to the bit-error-rate (BER) performance. Proof-of-concept experiments are carried out with both schemes under emulated scenarios of channel blockage. The RC scheme exhibits better BER performance when observed experimentally, validating the proposed theoretical model for the two spatial diversity schemes. To understand the performance of RC and STBC schemes against the optical delay caused by the two optical channel path difference within one-bit interval, both schemes are experimentally investigated using on-off-keying modulation, and results show that RC still outperforms STBC. Both theoretical and experimental results indicate that RC has better robustness to channel blockage and differential channel paths induced optical delay.

Indoor optical wireless communications, repetition-coding, space-time-block-coding, transmitter diversity
0733-8724
5170-5177
Song, Tingting
9e387956-2e82-4fb0-9d5d-8f882e85f18b
Nirmalathas, Ampalavanapillai
1c1fbceb-fbf2-4070-be77-2eda9e134541
Lim, Christina
5b4d70b0-b17a-4e8f-82e3-57eabafbab7e
Wong, Elaine
44a12de7-0a05-4eba-a436-cf586492cfba
Lee, Ka Lun
9daf1849-d4a0-4ee9-b2fb-521673d9a1f2
Hong, Yang
73d5144c-02db-4977-b517-0d2f5a052807
Alameh, Kamal
1a59f0f9-1d5a-46fc-9e69-a7de17f10764
Wang, Ke
60aeff7b-b4c0-4b9d-8803-4578fd7ddef3
Song, Tingting
9e387956-2e82-4fb0-9d5d-8f882e85f18b
Nirmalathas, Ampalavanapillai
1c1fbceb-fbf2-4070-be77-2eda9e134541
Lim, Christina
5b4d70b0-b17a-4e8f-82e3-57eabafbab7e
Wong, Elaine
44a12de7-0a05-4eba-a436-cf586492cfba
Lee, Ka Lun
9daf1849-d4a0-4ee9-b2fb-521673d9a1f2
Hong, Yang
73d5144c-02db-4977-b517-0d2f5a052807
Alameh, Kamal
1a59f0f9-1d5a-46fc-9e69-a7de17f10764
Wang, Ke
60aeff7b-b4c0-4b9d-8803-4578fd7ddef3

Song, Tingting, Nirmalathas, Ampalavanapillai, Lim, Christina, Wong, Elaine, Lee, Ka Lun, Hong, Yang, Alameh, Kamal and Wang, Ke (2019) Performance analysis of repetition-coding and space-time-block-coding as transmitter diversity schemes for indoor optical wireless Communications. IEEE Journal of Lightwave Technology, 37 (20), 5170-5177, [8765782]. (doi:10.1109/JLT.2019.2929801).

Record type: Article

Abstract

The benefits of 2 × 1 multiple-inputs-single-output scheme for transmitter diversity in the infrared indoor optical wireless communication link are theoretically investigated. The performance of repetition-coding (RC) and Alamouti-type real-valued space-time-block-coding (STBC) as effective transmitter diversity schemes is systematically compared under conditions of channel gain variation caused by the degradation in the received optical power due to the blocking of one optical beam of the optical wireless channel. It is shown that the linear addition of channel gains in the RC scheme outperforms the root-sum-square of channel gains in the STBC scheme with regards to the bit-error-rate (BER) performance. Proof-of-concept experiments are carried out with both schemes under emulated scenarios of channel blockage. The RC scheme exhibits better BER performance when observed experimentally, validating the proposed theoretical model for the two spatial diversity schemes. To understand the performance of RC and STBC schemes against the optical delay caused by the two optical channel path difference within one-bit interval, both schemes are experimentally investigated using on-off-keying modulation, and results show that RC still outperforms STBC. Both theoretical and experimental results indicate that RC has better robustness to channel blockage and differential channel paths induced optical delay.

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More information

Accepted/In Press date: 15 July 2019
e-pub ahead of print date: 18 July 2019
Published date: 15 October 2019
Keywords: Indoor optical wireless communications, repetition-coding, space-time-block-coding, transmitter diversity

Identifiers

Local EPrints ID: 435979
URI: http://eprints.soton.ac.uk/id/eprint/435979
ISSN: 0733-8724
PURE UUID: 6a588c14-c3e2-4807-89fc-135383c7a958

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Date deposited: 25 Nov 2019 17:30
Last modified: 25 Nov 2019 17:30

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Contributors

Author: Tingting Song
Author: Ampalavanapillai Nirmalathas
Author: Christina Lim
Author: Elaine Wong
Author: Ka Lun Lee
Author: Yang Hong
Author: Kamal Alameh
Author: Ke Wang

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