摘要:
Automatic repeat request (ARQ) operations can be implemented in wireless communications by sending (2401) a plurality of data packets in a superpacket, and responding (2430) with an acknowledgement packet that indicates which packets of the superpacket require retransmission.
摘要:
The frequency hopping pattern of a first wireless communication device is modified such that each transmission to a second wireless communication device is on a frequency (MS j+1 ) that the second device's normal frequency hopping pattern specifies for one of the second device's next several transmissions to the first device. This permits the second device to make quality measurements (54) on a frequency that the second device will soon use (51) for transmission to the first device.
摘要:
Synchronization in time division duplex mode spread spectrum communications systems using comma-free codes with components made of QPSK-modulated secondary synchronization codes.
摘要:
A method of operating a communication circuit comprises the steps of receiving a plurality of signals (508-509, 514-516) from a plurality of remote transmitters (502-506) and determining which of the plurality of remote transmitters use transmit diversity. A signal strength of each respective signal of the plurality of signals is calculated. One of the remote transmitters is selected in response to the steps of determining and calculating.
摘要:
System and method for detecting transmissions from multiple users in a digital wireless communications system in the presence of interference. A preferred embodiment comprises derotating a received signal (510) by a specified amount, determining channel estimates (515), which can include the determination of the number of users (interferers plus a desired user), and extracting information (520) transmitted by the desired user from the received signal. Successive and parallel multiuser detection schemes are provided for extracting the information from the received signal.