Patent ID: 7646700
Filing Date: 2010-01-12
Classification: H04B,H04L

Abstract:
1. A transmitting device for transmitting data symbols and pilot symbols in an OFDM transmission system, the device comprising symbol generating means for generating said data symbols and said pilot symbols, means for transmitting said data symbols and pilot symbols respectively by using a plurality of subcarriers of said OFDM transmission system, wherein said symbol generating means is designed to selectively generate a first type pilot symbol and a second type pilot symbol being orthogonal to said first type pilot symbol so that a pilot symbol pattern in a frequency dimension comprises at least said first type pilot symbol to be transmitted by using a predefined subcarrier and second type pilot symbol to be transmitted by using other predefined subcarrier, wherein said pilot symbol pattern has a different pattern in a time dimension from a succeeding pilot symbol pattern, and wherein at least some pairs of first pilot symbols comprised in said pilot symbol pattern and being adjacent in the time dimension are respectively orthogonal to the corresponding pairs of second pilot symbols comprised in said succeeding pilot symbol pattern.