Decoding apparatus and decoding method

摘要

Provided are a decoding apparatus and method for a system supporting an Orthogonal Frequency Division Multiple Access (OFDMA) scheme, the apparatus and method compensating received signals according to a wireless channel estimation result and thereby simply performing decoding by a coherent method. The decoding method includes the steps of: receiving a Quadrature phase shift keying (QPSK) modulated signal; compensating the received signals by applying a result of channel estimation based on pilot signals to the received signals; performing subcarrier demodulation to generate correlation metrics on the basis of the compensated received signals; and performing decoding using a decoding metric derived from the correlation metrics. The decoding apparatus and method compensate a received wireless signal according to a channel estimation result of a wireless channel through which a signal is transmitted, thereby performing decoding by a coherent method having a simple structure.

主权项

1. A decoding method for a wireless communication system, the method comprising the steps of:
receiving signals; compensating the received signals by applying a result of channel estimation based on pilot signals to the received signals; obtaining an absolute value of the compensated received signals; calculating the inner products of the obtained absolute value and fundamental vector signals and summing the calculated inner products up to generate a correlation metric; wherein each the correlation metric uses a probability of a vector index being an order of a row in each tile or bins denoted by an order of a column; generating correlation metrics corresponding to each of the fundamental vector signals; wherein the correlation metrics denote probabilities of a relationship between fundamental vectors and tiles or bins of the obtained absolute value; generating a decoding metric for each candidate payload value using the correlation metrics, wherein the decoding metric is obtained by calculating a payload-likelihood which is probability of a final decoding value being a specific payload using the correlation metrics; and determining a payload of the received signal, the payload being a candidate payload value having a largest value of the decoding metrics; wherein an amplitude of the received signal is recorded as a multiple of unit reference value which is determined according to an amount of attenuation of the received signal.