2,191 research outputs found
Co-Channel Interference Cancellation in OFDM Networks using Coordinated Symbol Repetition and Soft Decision MLE CCI Canceler
In this paper, a new scheme of downlink co-channel interference (CCI)
cancellation in OFDM cellular networks is introduced for users at the
cell-edge. Coordinated symbol transmission between base stations (BS) is
operated where the same symbol is transmitted from different BS on different
sub-carriers. At the mobile station (MS) receiver, we introduce a soft decision
maximum likelihood CCI canceler and a modified maximum ratio combining (M-MRC)
to obtain an estimate of the transmitted symbols. Weights used in the combining
method are derived from the channels coefficients between the cooperated BS and
the MS. Simulations show that the proposed scheme works well under
frequency-selective channels and frequency non-selective channels. A gain of 9
dB and 6 dB in SIR is obtained under multipath fading and flat-fading channels,
respectively.Comment: 4 pages, 8 figures, IEEE International Conference on Signal
Processing and Communications, 2007. ICSPC 200
Parallel QR decomposition in LTE-A systems
The QR Decomposition (QRD) of communication channel matrices is a fundamental
prerequisite to several detection schemes in Multiple-Input Multiple-Output
(MIMO) communication systems. Herein, the main feature of the QRD is to
transform the non-causal system into a causal system, where consequently
efficient detection algorithms based on the Successive Interference
Cancellation (SIC) or Sphere Decoder (SD) become possible. Also, QRD can be
used as a light but efficient antenna selection scheme. In this paper, we
address the study of the QRD methods and compare their efficiency in terms of
computational complexity and error rate performance. Moreover, a particular
attention is paid to the parallelism of the QRD algorithms since it reduces the
latency of the matrix factorization.Comment: The eleventh IEEE International Workshop on Signal Processing
Advances for Wireless Communications, 5 pages, 4 figures, 4 algorithms, 1
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