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In this paper, we deal with channel estimation and intercarrier interference mitigation for very high mobility OFDM systems, the communication is between a BS and a train traveling at a speed of 500km/hr. The scheme proposed here uses piece-wise polynomial expansion to approximate time-variations of multipath channels. Two adjacent symbols are utilized to estimate the first and second-order parameters...
The paper studies the construction of error-estimation-codes (EEC), which estimate the bit-error-rate (BER) of packet transmissions. The concept of EEC was first proposed by Chen et.al in SIGCOMM 2010. In the same work group-sampling-error-estimation-codes (GSEEC) were constructed. Assuming the packet length is n, GSEEC requires communication overhead O(log(n)) and coding complexity O(n) to reliably...
This paper addresses the problem of unsupervised soft BER estimation for digital communications systems, where no prior knowledge about transmitted information bits is available. We show that the problem of BER estimation is equivalent to estimating the conditional probability density functions (pdf)s of soft channel/receiver outputs. We also propose a non parametric Gaussian Kernel-based pdf estimation...
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