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Iterative Initial Synchronization in Wireless Communications

Iterative Initial Synchronization in Wireless Communications
Iterative Initial Synchronization in Wireless Communications
The family of m-sequences has been widely used for the initial synchronization of generations of wireless systems. We exploit the fact that R chips uniquely and unambiguously determine the entire (2R - 1) chips of a sequence by designing a Soft-In-Soft-Out (SISO) Recursive Soft Sequence Estimation (RSSE) scheme, relying on similar iterative processing techniques to those of turbo decoders. To elaborate a little further, once R chips have been received, the RSSE scheme augments the soft intrinsic information gleaned from the channel with the aid of the extrinsic information constituted by the previous received chips. Hence, these turbo iterations substantially improve the initial synchronization performance attained.
The scheme advocated is then used for investigating the performance of a large variety of m-sequences as well as of the family of concatenated sequences, which can be generated with the aid of a pair of m-sequences. These concatenated sequences have substantial benefits over the m-sequences. We continued our investigations by tabulating the most attractive m-sequences and concatenated sequences having a large variety of different lengths. The convergence properties of our RSSE schemes were investigated with the aid of EXtrinsic Information Transfer (EXIT) charts.
Finally, as a further refinement we introduced an Automatic Gain Control (AGC) scheme into our RSSE arrangements, which substantially improved its performance.
University of Southampton
Ahmed, Abbas
7755adc8-3702-4719-ad2d-39987898ff81
Ahmed, Abbas
7755adc8-3702-4719-ad2d-39987898ff81
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Ahmed, Abbas (2019) Iterative Initial Synchronization in Wireless Communications. University of Southampton, Doctoral Thesis, 164pp.

Record type: Thesis (Doctoral)

Abstract

The family of m-sequences has been widely used for the initial synchronization of generations of wireless systems. We exploit the fact that R chips uniquely and unambiguously determine the entire (2R - 1) chips of a sequence by designing a Soft-In-Soft-Out (SISO) Recursive Soft Sequence Estimation (RSSE) scheme, relying on similar iterative processing techniques to those of turbo decoders. To elaborate a little further, once R chips have been received, the RSSE scheme augments the soft intrinsic information gleaned from the channel with the aid of the extrinsic information constituted by the previous received chips. Hence, these turbo iterations substantially improve the initial synchronization performance attained.
The scheme advocated is then used for investigating the performance of a large variety of m-sequences as well as of the family of concatenated sequences, which can be generated with the aid of a pair of m-sequences. These concatenated sequences have substantial benefits over the m-sequences. We continued our investigations by tabulating the most attractive m-sequences and concatenated sequences having a large variety of different lengths. The convergence properties of our RSSE schemes were investigated with the aid of EXtrinsic Information Transfer (EXIT) charts.
Finally, as a further refinement we introduced an Automatic Gain Control (AGC) scheme into our RSSE arrangements, which substantially improved its performance.

Text
Final Thesis by Abbas Ahmed - Version of Record
Available under License University of Southampton Thesis Licence.
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Published date: March 2019

Identifiers

Local EPrints ID: 437692
URI: http://eprints.soton.ac.uk/id/eprint/437692
PURE UUID: 806e5222-dc41-4dd8-896c-45339109c63a
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 12 Feb 2020 17:30
Last modified: 13 Dec 2021 02:34

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Contributors

Author: Abbas Ahmed
Thesis advisor: Lajos Hanzo ORCID iD

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