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Wu, Yi
Publications (4 of 4) Show all publications
Wu, Y., Danev, D. & Larsson, E. G. (2012). Improved Detection of ACK/NACK Messages in the LTE Uplink Control Channel. Paper presented at 2012 IEEE 75th Vehicular Technology Conference (VTC Spring), 6-9 May 2012, Yokohama. IEEE
Open this publication in new window or tab >>Improved Detection of ACK/NACK Messages in the LTE Uplink Control Channel
2012 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we present an improved detector for ACK/NACK message detection in the LTE uplink control channel with imperfect channel state information at the receiver. The detector is based on the generalized likelihood-ratio test (GLRT) paradigm. We derive detection metrics for the cases when the noise variances at the receiver are known and unknown. Noise here may comprise both thermal noise and interference. Simulation results show remarkable performance gains of the GLRT-based detector with unknown noise variances compared to the training-based maximum-likelihood detector with unknown noise variances when the noise variances in two slots are different. Furthermore, the performance of the GLRT-based detector with unknown noise variances is nearly the same as that of the training-based maximum-likelihood detector with known noise variances.

Place, publisher, year, edition, pages
IEEE, 2012
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-87591 (URN)10.1109/VETECS.2012.6240179 (DOI)000309338500321 ()
Conference
2012 IEEE 75th Vehicular Technology Conference (VTC Spring), 6-9 May 2012, Yokohama
Available from: 2013-01-18 Created: 2013-01-18 Last updated: 2016-08-31
Wu, Y., Danev, D. & Larsson, E. G. (2012). On ACK/NACK messages detection in the LTE PUCCH with multiple receive antennas. In: Signal Processing Conference (EUSIPCO), 2012. Paper presented at 20th European Signal Processing Conference (EUSIPCO 2012), 27-31 August 2012, Bucharest, Romania (pp. 994-998). IEEE COMPUTER SOC
Open this publication in new window or tab >>On ACK/NACK messages detection in the LTE PUCCH with multiple receive antennas
2012 (English)In: Signal Processing Conference (EUSIPCO), 2012, IEEE COMPUTER SOC , 2012, p. 994-998Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we study ACK/NACK messages detection in the LTE physical uplink control channel (PUCCH) with multiple receive antennas. The LTE PUCCH is typically characterized by high interference variability due to severe inter-user interferences and slot-level frequency hopping. We present detection methods applicable for the cases when the noise variances at the receiver are known and unknown. Noise here may comprise both thermal noise and interference. The proposed detection technique is based on the generalized likelihood-ratio test (GLRT) paradigm. Simulation results show that GLRT-based detector offers a significant gain over the training-based maximum-likelihood detector when the noise variances in two slots are different and unknown. For the case when the noise variances at the receiver are known, the GLRT-based detector has nearly the same performance as the training-based maximum-likelihood detector.

Place, publisher, year, edition, pages
IEEE COMPUTER SOC, 2012
Keywords
signal detection; GLRT technique; LTE; multiple antennas
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-87990 (URN)000310623800200 ()978-1-4673-1068-0 (ISBN)
Conference
20th European Signal Processing Conference (EUSIPCO 2012), 27-31 August 2012, Bucharest, Romania
Available from: 2013-01-28 Created: 2013-01-28 Last updated: 2016-08-31
Luo, C., Wu, Y., Fei, Z., Larsson, E. G. & Kuang, J. (2011). Adaptive Partial Decode-and-Forward Relaying with Quantized Feedback. In: Proceedings of the IEEE Vehicular Technology Conference (VTC): . Paper presented at 2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring; Budapest; Hungary (pp. 1-6). IEEE
Open this publication in new window or tab >>Adaptive Partial Decode-and-Forward Relaying with Quantized Feedback
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2011 (English)In: Proceedings of the IEEE Vehicular Technology Conference (VTC), IEEE , 2011, p. 1-6Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we propose two spectrally efficient adaptive partial decode-and-forward (DF)cooperative communication schemes, which are adaptive partialrepetition DF with quantized feedback (APR-DF-QF) and adaptivepartial coded cooperation DF with quantized feedback (APCC-DF-QF).We assume the relay node only has partial channel-state information, which is obtainedvia an quantized feedback link. We use the so-called mutual information (MI)model to adaptively optimize the amount of data that need to beforwarded by the relay node under a given block-error-rateconstraint. Simulation results show that with the optimized feedback, the MI model can predict well theoptimal amount of information that needs to be forwarded by therelay node, and that the two proposed schemes can substantiallyincrease the spectral efficiency.

Place, publisher, year, edition, pages
IEEE, 2011
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-64666 (URN)10.1109/VETECS.2011.5956306 (DOI)978-1-4244-8332-7 (ISBN)
Conference
2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring; Budapest; Hungary
Available from: 2011-01-31 Created: 2011-01-31 Last updated: 2016-08-31
Wu, Y., Tang, Z. & Larsson, E. G. (2011). Optimization of Frame Length in OFDMA Systems Taking into Account the Control Signaling Cost. In: Proceedings of the IEEE Vehicular Technology Conference (VTC), 2011: . Paper presented at 2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring; Budapest; Hungary (pp. 1-5). IEEE
Open this publication in new window or tab >>Optimization of Frame Length in OFDMA Systems Taking into Account the Control Signaling Cost
2011 (English)In: Proceedings of the IEEE Vehicular Technology Conference (VTC), 2011, IEEE , 2011, p. 1-5Conference paper, Published paper (Refereed)
Abstract [en]

Dynamic OFDMA has been recognized as a promising technique forimproving the performance of future wireless cellularsystems. However, this potential performance improvement comes at thecost of additional signaling overhead, which can have a non-negligibleeffect on the system efficiency.  In this paper, we propose a newmethod for optimizing the frame length for the downlink in OFDMAsystems. The method maximizes the system efficiency by taking intoaccount both the channel conditions and the amount of signalingoverhead needed to deliver scheduling maps to the users. We formulatethe frame length optimization problem mathematically. By exploitingthe structure of this problem, we develop an algorithm that solves asequence of dynamic programming problems. Simulation results revealsome insight into fundamental limitations as well as provide guidelinesfor the design of dynamic OFDMA systems.

Place, publisher, year, edition, pages
IEEE, 2011
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-64603 (URN)10.1109/VETECS.2011.5956516 (DOI)978-1-4244-8332-7 (ISBN)
Conference
2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring; Budapest; Hungary
Available from: 2011-01-28 Created: 2011-01-28 Last updated: 2016-08-31
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