[Paper] Channel Estimation Scheme under Class A Impulsive Noise Environment

Abstract

OFDM (Orthogonal Frequency Division Multiplexing) is the modulation scheme that is widely used in broad band power line communication (PLC). In OFDM transmission, impulsive noise is one of the major factors that limits the performance of PLC systems. In order to sufficiently reduce the influence of impulsive noise, precise estimation of channel transfer function is necessary. In this paper, the estimation scheme of channel transfer function under existence of additive impulsive noise is proposed. In the proposed scheme, successive two pilot OFDM symbols are used for reduction of the influence of impulsive noise. As the results, it is possible to perform precise estimation of channel transfer functions.

[Paper] Efficient Channel Estimation Scheme under Impulsive Noise Environment

“…where r denotes the attenuation of the second path and DUR (Desired to Undesired Ratio) is expressed by DU R[dB] = 10log 10 (1/r 2 ). Parameters used in the simulation for channel estimation and bit error rate characteristics are shown in Table 1 and the referenced paper 16) .…”

“…We have already proposed the scheme for channel estimation under these situations using the pilot symbols inserted in two successive OFDM symbols 16) . However, data transmission performance degrades because two successive OFDM symbols are used for channel estimation.…”

“…Using Two Successive OFDM Symbols In this subsection, the conventional channel estimation scheme using two successive OFDM symbols is described. The details of this scheme is shown in the referenced paper 16) . Fig.…”

“…However, the pilot symbols for channel estimation are also affected by impulsive noises and the scheme to estimate transmission channel under impulsive noise channels is required. We have already proposed the scheme for channel estimation under these situations using the pilot symbols inserted in two successive OFDM symbols 16) . However, data transmission performance degrades because two successive OFDM symbols are used for channel estimation.…”