Differential distributed quasi-orthogonal space-time-frequency coding

We propose differential distributed quasi-orthogonal space-time-frequency coding (DQSTFC) to cater for broadband cooperative networks operating in scenarios where channel state information (CSI) acquisition is impractical. Our differential DQSTFC scheme combines the concept of differential modulatio...

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Vydáno v:2012 Wireless Advanced s. 115 - 120
Hlavní autoři: Owojaiye, G., Delestre, F., Yichuang Sun
Médium: Konferenční příspěvek
Jazyk:angličtina
Vydáno: IEEE 01.06.2012
Témata:
differential distributed quasi-orthogonal space time frequency codes
pairwise decoding
Space time frequency mapping
Wireless communication
ISBN:1457721937, 9781457721939
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Abstract We propose differential distributed quasi-orthogonal space-time-frequency coding (DQSTFC) to cater for broadband cooperative networks operating in scenarios where channel state information (CSI) acquisition is impractical. Our differential DQSTFC scheme combines the concept of differential modulation, space-time-frequency (STF) mapping and quasi-orthogonal coding in cooperative networks. From this, we develop a scheme that exploits the achievable diversity gain in the spatial, temporal and frequency dimensions, and guarantees full code rate in non-coherent broadband cooperative networks. Different from existing STF schemes where full code rate is only achievable for cooperative networks with two relay nodes, and unlike other STF schemes that assume coherent signal recovery, our differential DQSTFC scheme is able to guarantee full code rate for cooperative networks with more than two relay nodes while guaranteeing non-coherent signal recovery. We first introduce our STF mapping scheme, we then show how the quasi-orthogonal codewords are constructed from a special choice of signal sets such that full code-rate signals are obtained. Then we present the full differential encoding and decoding setup for cooperative networks with four relay nodes. Unlike other works where the quasi-static channel assumption is adopted for long symbol periods, we show that performance degradation can be reduced when the quasi-static channel assumption is adopted only across adjacent symbols. Simulation results show that our scheme is robust against time-selective and frequency-selective fading compared to other related schemes.
AbstractList We propose differential distributed quasi-orthogonal space-time-frequency coding (DQSTFC) to cater for broadband cooperative networks operating in scenarios where channel state information (CSI) acquisition is impractical. Our differential DQSTFC scheme combines the concept of differential modulation, space-time-frequency (STF) mapping and quasi-orthogonal coding in cooperative networks. From this, we develop a scheme that exploits the achievable diversity gain in the spatial, temporal and frequency dimensions, and guarantees full code rate in non-coherent broadband cooperative networks. Different from existing STF schemes where full code rate is only achievable for cooperative networks with two relay nodes, and unlike other STF schemes that assume coherent signal recovery, our differential DQSTFC scheme is able to guarantee full code rate for cooperative networks with more than two relay nodes while guaranteeing non-coherent signal recovery. We first introduce our STF mapping scheme, we then show how the quasi-orthogonal codewords are constructed from a special choice of signal sets such that full code-rate signals are obtained. Then we present the full differential encoding and decoding setup for cooperative networks with four relay nodes. Unlike other works where the quasi-static channel assumption is adopted for long symbol periods, we show that performance degradation can be reduced when the quasi-static channel assumption is adopted only across adjacent symbols. Simulation results show that our scheme is robust against time-selective and frequency-selective fading compared to other related schemes.
Author Delestre, F.
Owojaiye, G.
Yichuang Sun
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  givenname: F.
  surname: Delestre
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  surname: Yichuang Sun
  fullname: Yichuang Sun
  email: Y.Sun@herts.ac.uk
  organization: Sch. of Eng. & Technol., Univ. of Hertfordshire, Hatfield, UK
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Snippet We propose differential distributed quasi-orthogonal space-time-frequency coding (DQSTFC) to cater for broadband cooperative networks operating in scenarios...
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SubjectTerms differential distributed quasi-orthogonal space time frequency codes
pairwise decoding
Space time frequency mapping
Wireless communication
Title Differential distributed quasi-orthogonal space-time-frequency coding
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