Abstract:
A transmitting apparatus includes an OFDM modulator that generates a first modulation symbol by modulating a first information signal using a first modulation scheme, a signal point of the first modulated information signal being at a first position in an in-phase quadrature-phase plane. A second modulation symbol by modulating a second information signal using the first modulation scheme, and by changing a second position at which a signal point of the modulated second information signal is arranged to a third position in the in-phase quadrature-phase plane, and an OFDM modulation signal including the first modulation symbol and the second modulation symbol, wherein the OFDM modulation signal comprises a plurality of subcarriers.
Abstract:
On a transmission side, a spectrum- spread spread modulating signal is multiplexed with a spectrum-not-spread information modulating signal in the same frequency band, and, on a reception side, a spread-spectrum demodulating unit (1803) demodulates the spread modulating signal. Then, a spread-spectrum modulating signal reproducing unit (1805) generates a replica signal of the spread modulating signal and a subtraction unit (1807) removes the replica signal from a multiplexed signal to thereby extract an information signal not spectrum-spread. Accordingly, even when many information signals are transmitted in the same frequency band, they can be satisfactorily separated and demodulated on the reception side.
Abstract:
A wireless terminal and an operation method is provided to synchronize with a base station by successfully performing by performing correlating operation with a multi-branch psync. A wireless terminal operates in order to receive a wide band code division multiple access(WCDMA) signal from a clock circuit, wireless interface and a PSYNC(Primary Synchronization) module. The clock circuit produces a wireless terminal clock by using an oscillator of a wireless terminal. The wireless interface uses the clock of a base station which is more exact than the oscillator of the wireless terminal. The wireless interface receives the WCDMA signal generated by the base station. A PSYNC module(1200) comprises a plurality of PSYNC correlation branches(1204A~1204N). Each PSYNC correlation branch rotates the WCDMA signal on the basis of each frequency offset with the phase.
Abstract:
송신측에서 스펙트럼 확산된 확산 변조 신호와 스펙트럼 확산되지 않는 정보 변조 신호를 동일 주파수 대역으로 다중화하고, 수신측에서는, 우선 스펙트럼 확산 복조부(1803)에 의해 확산 변조 신호를 복조한다. 다음에 스펙트럼 확산 변조 신호 재생부(1805)에 의해 확산 변조 신호의 레플리카 신호를 생성하고, 감산부(1807)에서 다중화 신호로부터 레플리카 신호를 제거하는 것으로 스펙트럼 확산되어 있지 않은 정보 신호를 추출한다. 이에 따라, 동일 주파수 대역에서 많은 정보 신호를 전송한 경우에도, 수신측에서 그들을 양호하게 분리 복조할 수 있게 된다.
Abstract in simplified Chinese:一种无线终端,用于从基站接收宽带码分多址(WCDMA)信号,包括时钟电路、无线界面和主同步模块。时钟电路使用无线终端振荡器生成无线终端时钟。无线界面接收WCDMA信号,该信号由基站使用基站使用生成,该基站时钟使用基站振荡器生成,该基站振荡器比无线终端振荡器更为精确。PSYNC模块包括多个PSYNC相关分之,每个PSYNC相关分支基于各自的频率偏移量对WCDMA信号进行相位旋转,在多个采样位置将相位旋转后的WCDMA信号与主同步信道(PSCH)码创建关联,基于多个采样位置中每一位置的相关性生成PSYNC相关能。