Open AccessBER Performance of Cooperative Transmission for the Uplink of TDD‐CDMA Systems
Author(s) -
Van Khuong Ho,
Kong Hyung Yun
Publication year - 2006
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.06.0105.0071
Subject(s) - telecommunications link , rayleigh fading , electronic engineering , computer science , bit error rate , code division multiple access , transmission (telecommunications) , duplex (building) , fading , additive white gaussian noise , antenna diversity , telecommunications , engineering , antenna (radio) , decoding methods , channel (broadcasting) , dna , biology , genetics
In time division duplex (TDD) code division multiple access (CDMA) systems, chip‐synchronous transmission in the uplink is obtainable, thus leading to free multiple access interference in flat Rayleigh fading channels plus additive white Gaussian noise. This motivates us to develop a novel cooperative transmission strategy that allows single‐antenna devices to benefit from spatial diversity using orthogonal signature sequences. The proposed cooperation is applicable to many digital modulation methods and achieves the fullest diversity level, low implementation complexity, and a full data rate. Closed‐form bit‐error‐rate expressions were also derived and compared to simulation results in order to evaluate its validity. A variety of numerical results demonstrated the cooperation's superiority over single transmission under the same transmit power constraint.