Method for processing a received signal to which channel state information is applied in an orthogonal frequency-division multiplexing system

Abstract

Provided is a method for processing received signal by applying channel status information based on OFDM. The method applies CSI to a soft-decision value of the received signal and thus can more enhance performance than a method applied to a typical decoder even without using an additional memory and the increase of a system clock speed. The method appropriately perform adjustment suitable for a soft-decided and received signal in applying pre-estimated CSI to a decoder, thereby more enhancing performance and enabling adaptive application based on the change of a channel status. The method includes performing a first operation of calculating a new second Channel Status Information (CSI) value CSI NEW for enhancing reliability of a received first CSI CSI RECEIVED , and applying a weight value to the calculated new second CSI value CSI NEW to calculate a third CSI value CSI WEIGHTED ; performing a second operation of applying the third CSI value CSI WEIGHTED having the weight value to a first soft-decision value S SOFTDECISION of an actually-received signal to calculate a second soft-decision value S SOFTDECISION+CSI adjusted; and performing a third operation of restrictedly controlling an output range of the calculated second soft-decision value S SOFTDECISION+CSI to finally obtain a third soft-decision value S SOFTDECISION+CSI _ Bounded calculated.

Description

technical field [0001] The present invention relates to a signal receiving method based on Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing), in particular to a method for processing received signals using channel state information in an OFDM system, estimating channel state information ( CSI: CHANNEL STATE INFORMATION), after it is corrected, the channel state information is recalculated through the weighted value application step, and it is applied to the received signal to improve the receiving performance of the receiver. Background technique [0002] As far as the multi-carrier transmission method based on OFDM is concerned, the influence of the transmission channel on the carriers allocated according to each frequency varies with each carrier. For this reason, on the receiving side, each channel state is estimated using signals transmitted by each carrier, and the information thus estimated is represented by a predetermined v...

AI Technical Summary

Problems solved by technology

[0007] This prior art utilizes channel state information to maximize the decoding performance in the receiving system environment, and transmits the received signal and channel state information to a Viterbi (Viterbi) decoder, which needs to be processed in Viterbi ( In this case, there is a disadvantage that a function unit using a memory element such as a de-interleaver (De-interleaver) exists between the Viterbi decoder and the soft decision unit of the received signal. In addition, the clock speed (speed of a clock) used to transmit the received signal and channel state information must be increased

[0008] Moreover, in the conventional method, the estimated channel state information is used in the decoder, so there is a problem that proper correction cannot be performed based on the soft-decision received signal.

Images