Abstract: Techniques to more efficiently transmit pilot and signaling on the uplink in an OFDM system. With subband multiplexing, M usable subbands in the system are partitioned into Q disjoint groups of subbands. Each subband group may be assigned to a different terminal for uplink pilot transmission. Multiple terminals may transmit simultaneously on their assigned subbands. The transmit power for the pilot may be scaled higher to attain the same total pilot energy even though S instead of M subbands are used for pilot transmission by each terminal. Pilot transmissions from the terminals are received, and a channel estimate is derived for each terminal based on the pilot received on the assigned subbands. The channel estimate comprises a response for additional subbands not included in the assigned group. Subband multiplexing may also be used for uplink signaling transmission.

Abstract: Techniques for emulating a first wireless communication device on a wide area network with a second wireless communication device utilizing a local link are disclosed. In one aspect, a first wireless communication device transmits identity information to the second wireless communication device over the local link. The second wireless communication device accesses a wide area network using the identity information received. In another aspect, a first wireless communication device signals a second wireless communication device to emulate the first and access the wide area network. In yet another aspect, the local link is a wireless local link. These aspects have benefits including facilitating emulation of a wireless communication device without exchanging a removable identity module, allowing use of the identity, phone number, or service contract of the first device, and availing the features and systems supported by the second device.

Abstract: Techniques for synchronizing an emulated wireless communication device over a local link are disclosed. In one aspect, the emulating device monitors received signals for information directed to the emulated device. The information is delivered to the emulated device over the local link. In another aspect, the emulated device updates stored information with the information received over the local link. In yet another aspect, a previously emulated device accesses a wide area network directly, using synchronized information. Various other aspects are also presented. These aspects have benefits including keeping an emulated device synchronized with a wide area network such that post-emulation access attempts are made with updated information and parameters.

Abstract: A received symbol stream is oversampled and correlated with a known sync word to determine the correlation properties of the oversampled signal with a known sync word. A linear filter, such as a moving average window filter, is convolved with the correlation signal to generate a convolution signal. Once the convolution signal has reached a predetermined threshold, it is scanned over a predetermined window of oversamples. If the convolution signal exceeds the threshold for the window of oversamples, the sync word has been found and the symbol stream is down-sampled at intervals that depend on the data rate of the symbol stream. This down-sampling process may be done by picking the center oversample corresponding to each information symbol given the timing alignment, or by doing a majority vote over a multiple number of samples centered around the center oversample.