Patent ID: 8223861
Filing Date: 2012-07-17
Classification: H04L

Abstract:
1. A joint carrier synchronization and channel equalization method for OFDM systems, that is suitable for use in a receiver of said OFDM (Orthogonal Frequency Division Multiplexing) systems, comprising the following steps: (A) receiving a first reception signal sample of a first OFDM symbol in a joint carrier synchronization and channel equalization device, then outputting a first received sub-channel signal on each sub-channel in a frequency domain, meanwhile, simultaneously obtaining a phase error and a gain error on each said sub-channel in said frequency domain respectively utilizing a phase error detector and a gain error detector, disposed in parallel relation within the joint carrier synchronization and channel equalization device; (B) obtaining in the joint carrier synchronization and channel equalization device an execution carrier frequency offset factor, an execution phase compensation factor based on said phase error on each said sub-channel in said frequency domain, and obtaining an execution gain compensation factor based on said gain error on each said sub-channel in said frequency domain; (C) multiplying in the joint carrier synchronization and channel equalization device a second reception signal sample of a second OFDM symbol by said execution carrier frequency offset factor, hereby eliminating a phase offset of said second reception signal sample in a time domain; (D) outputting in the joint carrier synchronization and channel equalization device a second received sub-channel signal on each said sub-channel in said frequency domain by using said second reception signal sample; and (E) multiplying said execution gain compensation factor and said execution phase compensation factor in the joint carrier synchronization and channel equalization device by said second received sub-channel signal, thus compensating a magnitude distortion and a phase distortion of said second received sub-channel signal on each said sub-channel in said frequency domain.