초록 ▼

A method and apparatus is provided to facilitate coherent communication in a random access channel. In encoding, reference symbols are inserted into a stream of access channel message data symbols and appended to a synchronization message to form a reference coded access channel transmission. Subseq

A method and apparatus is provided to facilitate coherent communication in a random access channel. In encoding, reference symbols are inserted into a stream of access channel message data symbols and appended to a synchronization message to form a reference coded access channel transmission. Subsequently, the access channel transmission is prepared for transmission over a communication channel by being spread with a spreading code. In decoding, a known synchronization sequence is correlated with a received communication signal to generate a correlation peak when a synchronization message is present. The received communication signal is despread with a spreading code to derive a stream of reference samples and data samples. A channel response is determined from the correlation peak and revised based on estimates derived from the stream of reference samples. Finally, an estimated data symbol is detected from the stream of data samples by utilizing the revised channel response.

대표청구항 ▼

[ What is claimed is:] [1.] A communication unit for use in a communication system comprising:(a) reference means for inserting reference symbols into a stream of access channel message data symbols to form a reference coded stream of access channel message data symbols;(b) synch insertion means, op

[ What is claimed is:] [1.] A communication unit for use in a communication system comprising:(a) reference means for inserting reference symbols into a stream of access channel message data symbols to form a reference coded stream of access channel message data symbols;(b) synch insertion means, operatively coupled to the reference means, for appending the reference coded stream of access channel message data symbols onto the end of a synchronization message to form a reference coded access channel transmission; and(c) spreading means, operatively coupled to the synch insertion means, for preparing the reference coded access channel transmission for transmission over a communication channel by spreading the reference coded access channel transmission with a spreading code to form a spread reference coded access channel transmission prior to transmission over the communication channel.