Robust differential modulations for asynchronous cooperative systems

Accurate channel state information and time/frequency synchronization are challenging to acquire in mobile ad hoc cooperative set-ups, where resource-constrained relaying terminals rapidly (dis)join cooperation. This paper derives low-complexity differential modulations and cooperative transmission...

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Vydáno v:	Signal processing Ročník 105; s. 30 - 42
Hlavní autoři:	Cano, Alfonso, Morgado, Eduardo, Ramos, Javier, Caamaño, Antonio J.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Amsterdam Elsevier B.V 01.12.2014 Elsevier
Témata:	Applied sciences Carrier frequency offset Coding, codes Cooperative communications Decode-and-forward Detection, estimation, filtering, equalization, prediction Differential modulation Exact sciences and technology Information, signal and communications theory Modulation, demodulation Multiplexing OFDM Signal and communications theory Signal, noise Synchronization Telecommunications and information theory Cooperative communications Decode-and-forward OFDM Synchronization Carrier frequency offset Differential modulation Performance evaluation Block code Relaying Parameter estimation Time division multiplexing Mapping Coding Channel estimation Algorithm complexity Multiple frequency Space diversity Multicarrier Transmission protocol Cooperative systems Space time Orthogonal code Carrier frequency Orthogonal frequency division multiplexing Signal processing Frequency offset Timing Signal to noise ratio
ISSN:	0165-1684, 1872-7557
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Abstract	Accurate channel state information and time/frequency synchronization are challenging to acquire in mobile ad hoc cooperative set-ups, where resource-constrained relaying terminals rapidly (dis)join cooperation. This paper derives low-complexity differential modulations and cooperative transmission schemes so that detection at the receiver is feasible without channel knowledge or synchronization information. A simple distributed doubly-differential (DD) time-division multiplexing (TDM) scheme using diagonal space–time (ST) unitary codes is derived to bypass multiple carrier frequency offsets (CFOs) and collect space diversity. Precoded differential orthogonal frequency division multiplexing (OFDM) transmissions are derived to additionally bypass timing offsets and collect multipath diversity using either DD diagonal or single-differential (SD) orthogonal ST block codes (OSTBCs). DD diagonal mappings suffer from considerable coding gain and signal-to-noise ratio (SNR) loss due to unitary constellation constraints and noise enhancement at the receiver. SD-OSTBCs achieve higher performance with reduced decoding complexity, at the cost of reduced CFO mitigation range. Simple and robust non-coherent selective and adaptive transmissions are also included, showing that full space and multipath diversity can still be achieved even with decoding errors at relays. Simulations corroborate theoretical claims. •We develop a cooperative DD-TDM scheme that deals with multiple CFOs among relays.•We develop a DD-TDM OFDM scheme to allow for both CFO and timing/multipath effects.•We develop a SD-OSTBC OFDM scheme for high multipath spread and number of relays.•Simple and robust non-coherent selective and adaptive transmissions are also included.•Full space and multipath diversity are achieved even with decoding errors at relays.
AbstractList	Accurate channel state information and time/frequency synchronization are challenging to acquire in mobile ad hoc cooperative set-ups, where resource-constrained relaying terminals rapidly (dis)join cooperation. This paper derives low-complexity differential modulations and cooperative transmission schemes so that detection at the receiver is feasible without channel knowledge or synchronization information. A simple distributed doubly-differential (DD) time-division multiplexing (TDM) scheme using diagonal space–time (ST) unitary codes is derived to bypass multiple carrier frequency offsets (CFOs) and collect space diversity. Precoded differential orthogonal frequency division multiplexing (OFDM) transmissions are derived to additionally bypass timing offsets and collect multipath diversity using either DD diagonal or single-differential (SD) orthogonal ST block codes (OSTBCs). DD diagonal mappings suffer from considerable coding gain and signal-to-noise ratio (SNR) loss due to unitary constellation constraints and noise enhancement at the receiver. SD-OSTBCs achieve higher performance with reduced decoding complexity, at the cost of reduced CFO mitigation range. Simple and robust non-coherent selective and adaptive transmissions are also included, showing that full space and multipath diversity can still be achieved even with decoding errors at relays. Simulations corroborate theoretical claims. •We develop a cooperative DD-TDM scheme that deals with multiple CFOs among relays.•We develop a DD-TDM OFDM scheme to allow for both CFO and timing/multipath effects.•We develop a SD-OSTBC OFDM scheme for high multipath spread and number of relays.•Simple and robust non-coherent selective and adaptive transmissions are also included.•Full space and multipath diversity are achieved even with decoding errors at relays.
Author	Ramos, Javier Cano, Alfonso Morgado, Eduardo Caamaño, Antonio J.
Author_xml	– sequence: 1 givenname: Alfonso surname: Cano fullname: Cano, Alfonso email: alfon.cano@gmail.com – sequence: 2 givenname: Eduardo surname: Morgado fullname: Morgado, Eduardo email: eduardo.morgado@urjc.es – sequence: 3 givenname: Javier surname: Ramos fullname: Ramos, Javier email: javier.ramos@urjc.es – sequence: 4 givenname: Antonio J. surname: Caamaño fullname: Caamaño, Antonio J. email: antonio.caamano@urjc.es
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Keywords	Cooperative communications Decode-and-forward OFDM Synchronization Carrier frequency offset Differential modulation Performance evaluation Block code Relaying Parameter estimation Time division multiplexing Mapping Coding Channel estimation Algorithm complexity Multiple frequency Space diversity Multicarrier Transmission protocol Cooperative systems Space time Orthogonal code Carrier frequency Orthogonal frequency division multiplexing Signal processing Frequency offset Timing Signal to noise ratio
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SubjectTerms	Applied sciences Carrier frequency offset Coding, codes Cooperative communications Decode-and-forward Detection, estimation, filtering, equalization, prediction Differential modulation Exact sciences and technology Information, signal and communications theory Modulation, demodulation Multiplexing OFDM Signal and communications theory Signal, noise Synchronization Telecommunications and information theory
Title	Robust differential modulations for asynchronous cooperative systems
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