TY - JOUR
T1 - Quasi-orthogonal space-frequency coding in non-coherent cooperative broadband networks
AU - Owojaiye, Gbenga
AU - Delestre, Fabien
AU - Sun, Yichuang
N1 - © 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
PY - 2014/4/1
Y1 - 2014/4/1
N2 - So far, complex valued orthogonal codes have been used differentially in cooperative broadband networks. These codes however achieve less than unitary code rate when utilized in cooperative networks with more than two relays. Therefore, the main challenge is how to construct unitary rate codes for non-coherent cooperative broadband networks with more than two relays while exploiting the achievable spatial and frequency diversity. In this paper, we extend full rate quasi-orthogonal codes to differential cooperative broadband networks where channel information is unavailable. From this, we propose a generalized differential distributed quasi-orthogonal space-frequency coding (DQSFC) protocol for cooperative broadband networks. Our proposed scheme is able to achieve full rate, and full spatial and frequency diversity in cooperative networks with any number of relays. Through pairwise error probability analysis we show that the diversity gain of our scheme can be improved by appropriate code construction and sub-carrier allocation. Based on this, we derive sufficient conditions for the proposed code structure at the source node and relay nodes to achieve full spatial and frequency diversity.
AB - So far, complex valued orthogonal codes have been used differentially in cooperative broadband networks. These codes however achieve less than unitary code rate when utilized in cooperative networks with more than two relays. Therefore, the main challenge is how to construct unitary rate codes for non-coherent cooperative broadband networks with more than two relays while exploiting the achievable spatial and frequency diversity. In this paper, we extend full rate quasi-orthogonal codes to differential cooperative broadband networks where channel information is unavailable. From this, we propose a generalized differential distributed quasi-orthogonal space-frequency coding (DQSFC) protocol for cooperative broadband networks. Our proposed scheme is able to achieve full rate, and full spatial and frequency diversity in cooperative networks with any number of relays. Through pairwise error probability analysis we show that the diversity gain of our scheme can be improved by appropriate code construction and sub-carrier allocation. Based on this, we derive sufficient conditions for the proposed code structure at the source node and relay nodes to achieve full spatial and frequency diversity.
KW - Differential distributed quasi-orthogonal space-frequency codes
KW - orthogonal frequency division multiplexing
KW - pairwise error probability
KW - quasi-orthogonal codes
UR - http://www.scopus.com/inward/record.url?scp=84899951822&partnerID=8YFLogxK
U2 - 10.1109/TCOMM.2014.031214.120454
DO - 10.1109/TCOMM.2014.031214.120454
M3 - Article
AN - SCOPUS:84899951822
SN - 0090-6778
VL - 62
SP - 1218
EP - 1229
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
IS - 4
M1 - 6775016
ER -