초록 ▼

A wideband CDMA receiver system to accept messages from asynchronously transmitting base stations is provided. The base station transmission to each receiver includes a perch channel and at least one traffic channel. Although all the channels typically include pilot symbols for the purpose of demodu

A wideband CDMA receiver system to accept messages from asynchronously transmitting base stations is provided. The base station transmission to each receiver includes a perch channel and at least one traffic channel. Although all the channels typically include pilot symbols for the purpose of demodulating the information symbols of the channel, the pilot channel includes a higher proportion of pilot symbols to information symbols. Therefore, a perch channel based timing and estimation system is inherently more accurate. In addition, the perch channel is generally transmitted at higher power levels than a traffic channel, and the resulting, higher, signal to noise ratio signal also improves the accuracy of the timing and channel estimation. Based on the timing derived from the perch channel of a first base station, the receiver can set the timing of the traffic channel transmissions from a second base station, to more closely match the timing of traffic channel transmissions from the first base station. In this manner, the signal to noise ratio of the demodulated traffic channel information symbols is enhanced through the diversity of using the transmissions of two base stations. A method for receiving wideband CDMA transmissions from asynchronously transmitting base stations is also provided.

대표청구항 ▼

[What is claimed is:] [1.]for each base station from which a communication is received, identifying at least one transmission oath between the base station and the mobile station;despreading at least one received communication for each said transmission path identified between the base station and t

[What is claimed is:] [1.]for each base station from which a communication is received, identifying at least one transmission oath between the base station and the mobile station;despreading at least one received communication for each said transmission path identified between the base station and the mobile station, including despreading the broadcast channel data and reference symbols, and despreading the traffic channel data and reference symbols; andcalculating channel timing information for each transmission path identified between the base station and the mobile station, including the following steps:in response to the broadcast channel reference symbols despread in said step of despreading at least one received communication for each said transmission path, demodulating the broadcast channel reference symbols to provide transmission path weights and phase shift information;in response to the weights and phase shifts provided during the demodulation of the broadcast channel reference symbols, estimating weights and phase shifts to apply to data symbols; andin response to estimations made in the preceding step, demodulating the traffic channel data symbols.