초록 ▼

A transmitter which includes a quadrature phase shift keying (QPSK) modulator, and a receiver which includes a pilot correlation filter (PCF), a data matching filter (DMF), a timing recovery mechanism, a sampler, and a QPSK demodulator are provided in a wireless communication system. The transmitter

A transmitter which includes a quadrature phase shift keying (QPSK) modulator, and a receiver which includes a pilot correlation filter (PCF), a data matching filter (DMF), a timing recovery mechanism, a sampler, and a QPSK demodulator are provided in a wireless communication system. The transmitter transmits a frame of data symbols and pilot symbols to a receiver in a wireless system. The pilot symbols are inserted in the frame at known time intervals. The QPSK modulator modulates the frame of data and pilot symbols. As the receiver receives the frame of data and pilot symbols from the transmitter, the PCF recovers the pilot symbols sent by the transmitter, whereas the timing recovery mechanism tracks the timing of the pilot symbols in the frame. The DMF enhances the multipath response of the frame of data and pilot symbols at the known time intervals of the pilot symbols, and outputs a plurality of enhanced peaks. The sampler samples the multipath response of the frame of data and pilot symbols at each of the enhanced peaks. The QPSK demodulator demodulates the sampled frame of data and pilot symbols and recovers the data symbols using QPSK demodulation based on the sampled frame.

대표청구항 ▼

[ We claim:] [1.]1. A wireless communication system, comprising:a transmitter transmitting a frame of data symbols and pilot symbols, where the pilot symbols are inserted in the frame at known time intervals;a QPSK modulator modulating the frame of data symbols and pilot symbols using quadrature pha

[ We claim:] [1.]1. A wireless communication system, comprising:a transmitter transmitting a frame of data symbols and pilot symbols, where the pilot symbols are inserted in the frame at known time intervals;a QPSK modulator modulating the frame of data symbols and pilot symbols using quadrature phase shift keying (QPSK) modulation;a receiver receiving the frame of data symbols and pilot symbols from the transmitter;a pilot correlation filter recovering the pilot symbols and providing a multipath response of the frame of data and pilot symbols at the known time intervals of the pilot symbols;data matching filter enhancing the multipath response and providing an enhanced multipath response with a plurality of enhanced peaks;a sampler sampling the enhanced multipath response at each of the enhanced peaks and producing a sampled and enhanced multipath response; anda QPSK demodulator demodulating the sampled frame of data and pilot symbols and recovering the data symbols using quadrature phase shift keying (QPSK) demodulation based on the sampled and enhanced multipath response.