Method for reducing interference in OFDM wireless networks

摘要

Interference in a received orthogonal frequency division multiplexing (OFDM) symbol, modulated according to selected constellation points sk, is reduced. The symbol includes a set of pilot signals and a set of data signals yk, where k is a number of consecutive subcarriers used for the pilot and the data signals. The pilot signals are thresholded to detect interfering pilot signals, which are then erased. Channels Ĥk are estimated using remaining pilot signals. The set of data signals are decoded based on the estimated channels Ĥk, and, for each bit bi in the set of data signals, a logarithmic likely ratio (LLR);log⁢∑sk:bi=0⁢1yk-H^k⁢sk2∑sk:bi=1⁢1yk-H^k⁢sk2
is determined. The LLR is an indicator of the likely interference.

主权项

1. A method for reducing interference in a received orthogonal frequency division multiplexing (OFDM) symbol modulated according to selected constellation points sk, wherein the received symbol includes a set of pilot signals and a set of data signals yk, and k is a number of consecutive subcarriers used for the pilot and the data signals, comprising steps of:
thresholding the set of pilot signals to detect interfering pilot signals; erasing the detected interfering pilot signals; estimating channels Ĥk using remaining pilot signals; Ĥk determining, for each bit bi, in the set of data signals, a logarithmic likely ratio (LLR)log⁢∑sk:bi=0⁢1yk-H^k⁢sk2∑sk:bi=1⁢1yk-H^k⁢sk2; and decoding the set of data signals based on the determined LLR, wherein the steps are performed in a receiver, wherein k and i are integers.