Estimation and compensation for carrier frequency offset and sampling clock offset in a communication system

A system for compensating for clock frequency offset and sampling clock offset in a communication system comprising:

• a receiver configured to receive a communication signal, the communication signal having been transmitted from a transmitter via a communication channel, and the receiver having a signal processor, wherein the signal processor is configured to compensate for carrier frequency offset and for sampling clock offset by:
• extracting a vector of data symbols from the received signal;
• performing equalization on the data symbols;
• multiplying the data symbols by a compensation vector, wherein the compensation vector is computed from an estimate of the carrier frequency offset and an estimate of the sampling clock offset using a Taylor series approximation, and wherein the estimate of the carrier frequency offset is generated by estimating a common phase rotation using a first Taylor series approximation and wherein the estimate of the sampling clock offset is generated by estimating phase differences between pairs of pilot symbols using a second Taylor series approximation.

A system for estimating and compensating clock frequency offset and sampling clock offset in a communication system comprising:

• a receiver configured to receive a communication signal, the communication signal having been transmitted from a transmitter via a communication channel, and the receiver having a signal processor, wherein the signal processor is configured to generate an estimate of an carrier frequency offset and an estimate of a sampling clock offset from the received communication signal by:
• extracting a vector of pilot symbols from the received signal;
• performing equalization on the pilot symbols;
• generating the estimate of a carrier frequency offset by estimating a common phase rotation using a first Taylor series approximation;
• and generating the estimate of the sampling clock offset by estimating phase differences between pairs of pilot symbols using a second Taylor series approximation and wherein the signal processor is further configured to compensate for carrier frequency offset and for sampling clock offset by:
• extracting a vector of data symbols from the received signal;
• performing equalization on the data symbols;
• and performing compensation using a multiplier for each symbol to form phase corrected symbol, the multiplier representing a common phase offset and a phase offset according to a subcarrier index, wherein N is a number of subcarriers of the communication signal and the multiplier for each symbol is computed by performing N/2+1 exp calculations and using ejk=conj(e−jk) where k is a subcarrier index.

A system for compensating for clock frequency offset and sampling clock offset in a communication system comprising:

• a receiver configured to receive a communication signal, the communication signal having been transmitted from a transmitter via a communication channel, and the receiver having a signal processor, wherein the signal processor is configured to compensate for carrier frequency offset and for sampling clock offset by:
• extracting a vector of frequency domain data symbols from the received signal;
• performing equalization on the data symbols in the frequency domain;
• multiplying the data symbols by a compensation vector in the frequency domain, wherein the compensation vector is computed from an estimate of the carrier frequency offset and an estimate of the sampling clock offset using a Taylor series approximation.