TY - JOUR
T1 - Low-complexity blind synchronization and demodulation for (ultra-)wideband multi-user ad hoc access
AU - Luo, Xiliang
AU - Giannakis, Georgios B.
PY - 2006/7/1
Y1 - 2006/7/1
N2 - Synchronization is a performance-critical factor in most communication systems: from classical narrowband and emerging (ultra) wideband (UWB) point-to-point links to cooperative or ad hoc networking, where access must deal with multi-user interference (MUI) and possibly severe intersymbol interference (ISI). For universal applicability to all these scenarios, we develop a blind synchronization and demodulation scheme which relies on intermittent transmission of nonzero mean symbols. These enable MUI- and ISI-resilient timing acquisition via energy detection and low-complexity demodulation by matching to a synchronized aggregate template (SAT). The resultant SAT receiver offers distinct advantages over RAKE, has low-complexity and lends itself naturally to decision-directed enhancements. Its blind operation nicely fits the requirements of multi-user ad hoc access and its ability to handle ISI is particularly attractive for UWB communications. Analytical performance evaluation and simulations testing our novel scheme in UWB settings confirm its high potential for deployment.
AB - Synchronization is a performance-critical factor in most communication systems: from classical narrowband and emerging (ultra) wideband (UWB) point-to-point links to cooperative or ad hoc networking, where access must deal with multi-user interference (MUI) and possibly severe intersymbol interference (ISI). For universal applicability to all these scenarios, we develop a blind synchronization and demodulation scheme which relies on intermittent transmission of nonzero mean symbols. These enable MUI- and ISI-resilient timing acquisition via energy detection and low-complexity demodulation by matching to a synchronized aggregate template (SAT). The resultant SAT receiver offers distinct advantages over RAKE, has low-complexity and lends itself naturally to decision-directed enhancements. Its blind operation nicely fits the requirements of multi-user ad hoc access and its ability to handle ISI is particularly attractive for UWB communications. Analytical performance evaluation and simulations testing our novel scheme in UWB settings confirm its high potential for deployment.
KW - Ad hoc multiple access
KW - Blind receivers
KW - Synchronization
KW - Timing offset estimation
KW - Ultra-Wideband (UWB)
KW - Wireless sensor networks
UR - http://www.scopus.com/inward/record.url?scp=33748099153&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33748099153&partnerID=8YFLogxK
U2 - 10.1109/TWC.2006.1673104
DO - 10.1109/TWC.2006.1673104
M3 - Article
AN - SCOPUS:33748099153
VL - 5
SP - 1930
EP - 1941
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
SN - 1536-1276
IS - 7
M1 - 1673104
ER -