810,609 research outputs found
Impact of Channel Estimation Errors on Multiuser Detection via the Replica Method
For practical wireless DS-CDMA systems, channel estimation is imperfect due
to noise and interference. In this paper, the impact of channel estimation
errors on multiuser detection (MUD) is analyzed under the framework of the
replica method. System performance is obtained in the large system limit for
optimal MUD, linear MUD and turbo MUD, and is validated by numerical results
for finite systems.Comment: To appear in the EURASIP Journal on Wireless Communication and
Networking - Special Issue on Advanced Signal Processing Algorithms for
Wireless Communication
A Distributed Tracking Algorithm for Reconstruction of Graph Signals
The rapid development of signal processing on graphs provides a new
perspective for processing large-scale data associated with irregular domains.
In many practical applications, it is necessary to handle massive data sets
through complex networks, in which most nodes have limited computing power.
Designing efficient distributed algorithms is critical for this task. This
paper focuses on the distributed reconstruction of a time-varying bandlimited
graph signal based on observations sampled at a subset of selected nodes. A
distributed least square reconstruction (DLSR) algorithm is proposed to recover
the unknown signal iteratively, by allowing neighboring nodes to communicate
with one another and make fast updates. DLSR uses a decay scheme to annihilate
the out-of-band energy occurring in the reconstruction process, which is
inevitably caused by the transmission delay in distributed systems. Proof of
convergence and error bounds for DLSR are provided in this paper, suggesting
that the algorithm is able to track time-varying graph signals and perfectly
reconstruct time-invariant signals. The DLSR algorithm is numerically
experimented with synthetic data and real-world sensor network data, which
verifies its ability in tracking slowly time-varying graph signals.Comment: 30 pages, 9 figures, 2 tables, journal pape
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