Sampling frequency offset tracking based on decision feedback channel estimation

• Main Authors: ZHU ZHIXIA, TONG KWOK-KWAN, CHEUNG WEI LUN ALAN
• Format: Patent
• Language: Chinese; English
• Published: 19.04.2019
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

A Sampling Frequency Offset (SFO) tracking and estimation circuit performs SFO compensation on incoming data. A SFO acquisition module makes an initial coarse estimate using a Network Time Base (NTB)from the Media-Access-Controller (MAC) layer, or from the physical layer using adjacent synchronization symbols. A preamble channel estimator compares a frequency-domain preamble symbol to a referencesymbol to generate a first channel estimate. As additional symbols are received, converted to the frequency domain, demodulated, and error corrected, the resulting data are re-error-encoded and compared to the same symbol stored before error correction and demodulation to generate a decision feedback channel estimate. The conjugate of the decision feedback channel estimate is multiplied by the last channel estimate to generate a new SFO estimate that is scaled by a filter constant and used to adjust SFO compensation. Each symbol generates a new estimate without using pilots. 采样频偏(SFO)跟踪和估计电路对输入数据执行SFO补偿。SFO获取模块使用来自媒体访