Abstract: A wireless transceiver device capable of preventing collision includes a first wireless module and a second wireless module. The first wireless module includes a first wireless transceiver unit for transmitting and receiving wireless signals of a first wireless communication system, and an indication signal generating unit for generating an indication signal indicating that the first wireless transceiver unit starts to transmit or receive a wireless signal at a first time point before the first wireless transceiver unit transmits or receives the wireless signal. The second wireless module includes a second wireless transceiver unit for transmitting and receiving wireless signals of a second wireless communication system, and a transmission control unit for controlling the second wireless transceiver unit to stop transmitting or receiving wireless signals from the first time point according to the indication signal.

Abstract: A quadrature frequency division multiplexing (“OFDM”) wireless receiver, including methods and devices for adaptive quantization of OFDM signals according to modulation and coding schemes and sub-carrier frequency responses, is provided. Efficient quantization may be utilized to reduce the large dynamic range of signals to achieve circuit simplification and chip area reduction. In one embodiment, a quantization circuit includes a quantization selector to select quantization thresholds according to modulation and coding schemes and sub-carrier frequency responses, and a non-uniform quantizer to reduce input dynamic range so that an output is represented by fewer bits than an input.

Abstract: An apparatus for transmitting packets of a wireless local area network comprises a packet buffer area, a host controller and a timer. The packet buffer area is configured to temporarily store a plurality of packets. The host controller is configured to aggregate and control the plurality of packets in the packet buffer area. The timer is used to determine whether there are time-limited packets in the packet buffer area. While the host controller is aggregating the packets in the packet buffer area, an aggregation busy flag is enabled; and when the packet buffer area is outputting the time-limited packets, a timer busy flag is enabled.

Abstract: A quadrature frequency division multiplexing (“OFDM”) wireless receiver, including methods and devices for adaptive quantization of OFDM signals according to modulation and coding schemes and sub-carrier frequency responses, is provided. Efficient quantization may be utilized to reduce the large dynamic range of signals to achieve circuit simplification and chip area reduction. In one embodiment, a quantization circuit includes a quantization selector to select quantization thresholds according to modulation and coding schemes and sub-carrier frequency responses, and a non-uniform quantizer to reduce input dynamic range so that an output is represented by fewer bits than an input.

Abstract: The present invention provides apparatus and method for calibrating I/Q imbalance in a direct conversion transmitter-receiver, including generating a complex sinusoidal signal with a center frequency at ?i, sending the sinusoidal signal to the receiver and using FFT to estimate the I/Q the phase ?, the gain imbalance ?, and phase imbalance ?. The input signal is calibrated according to the estimated I/Q amplitude and phase imbalance.