Symbol recovery from an oversampled hard-decision binary stream

In a baseband portion of a receiver having a radio frequency portion, a method of recovering symbols from a binary data stream having a predetermined data rate, the method comprising:

• oversampling the binary data stream at a predetermined oversample rate to generate an oversampled signal;
• correlating the oversampled binary data stream with a known sync word to generate a correlation signal;
• constructing a moving average window;
• convolving the moving average window with the correlation signal to generate a convolution signal;
• identifying the timing alignment of a sync word within the convolution signal by choosing a peak of the convolution signal;
• and
• synchronizing the receiver to the binary data stream in response to the sync word wherein the binary data stream is sampled at predetermined times after the sync word.

A Bluetooth compliant receiver having a baseband portion that receives a binary data stream that is organized into Bluetooth compliant packets comprising an access code, the receiver comprising:

• means for oversampling the binary data stream at a predetermined oversample rate to generate an oversampled signal;
• means for correlating the oversampled binary data stream with a known sync word to generate a correlation signal;
• means for convolving an impulse response of a linear filter with the correlation signal to generate a convolution signal;
• means for identifying timing alignment of the access code by identifying a maximum value of the convolution signal;
• and
• means for synchronizing the receiver to the oversampled signal in response to the access code wherein the oversampled signal is sampled at predetermined times after the sync word.

In a mobile station apparatus having communications capability, the apparatus having a receiver that is Bluetooth compliant and comprising a baseband portion that receives a binary data stream that is organized into Bluetooth compliant packets comprising an access code, the receiver comprising:

• means for oversampling the binary data stream at a predetermined oversample rate to generate an oversampled signal;
• means for correlating the oversampled binary data stream with a known sync word to generate a correlation signal;
• means for convolving the an impulse response of a linear filter with the correlation signal to generate a convolution signal;
• means for identifying the access code in response to a maximum value of the convolution signal;
• and
• means for synchronizing the receiver to the oversampled signal in response to the access code wherein the oversampled signal is sampled at predetermined times after the sync word.

A method of recovering symbols from a binary data stream having a predetermined data rate, the method comprising:

• oversampling the binary data stream at a predetermined oversample rate to generate an oversampled signal;
• correlating the oversampled binary data stream with a known sync word to generate a correlation signal;
• constructing a moving average window;
• generating an impulse response for the moving average window;
• convolving the impulse response with the correlation signal to generate a convolution signal;
• identifying a sync word in response to the convolution signal;
• synchronizing the receiver to the binary data stream in response to the sync word;
• and
• sampling the oversampled signal at predetermined times after the sync word.

In a mobile station apparatus, the apparatus having a receiver and comprising a baseband portion that receives an oversampled, binary data stream that is organized into data packets, each data packet comprising a sync word, the receiver comprising:

• means for correlating the oversampled binary data stream with a known sync word to generate a correlation signal;
• means for constructing a moving average window;
• means for convolving the moving average window with the correlation signal to generate a convolution signal;
• means for identifying the sync word in response to a maximum value of the convolution signal;
• and
• means for synchronizing the receiver to the oversampled, binary data stream in response to the access code wherein the oversampled, binary data stream is sampled at predetermined times after the sync word.

A method of recovering symbols from a binary data stream having a data rate, the method comprising:

• oversampling the binary data stream at a predetermined oversample rate to generate an oversampled signal;
• correlating the oversampled binary data stream with a known sync word to create a correlation output;
• constructing a moving average window;
• convolving the moving average window with the correlation output to generate a convolution signal;
• and
• identifying a timing alignment of a sync word by choosing a peak in the convolution signal.