Waveform and frame structure for a fixed wireless loop synchronous CDMA communications system

A method for transmitting information in a Code Division Multiple Access communication system, comprising steps of:

• multiplexing data and control information into a data frame having data fields comprised of a plurality of data bytes separated by control message fields each comprised of a single byte of a multi-byte control message frame;
• encoding the data frame;
• inserting an unencoded frame boundary synchronization field into the data frame;
• spreading the data frame using a spreading code;
• and
• transmitting the spread data frame to a receiver.

A synchronous CDMA fixed wireless system comprised of a radio base unit (RBU) coupled to a telecommunications network and to a plurality of subscriber units (SUs) that communicate over CDMA radio channels, said RBU comprising:

• a first multiplexer for multiplexing data and control information intended for one SU into a data frame having data fields comprised of a plurality of data bytes separated by control message fields each comprised of a single byte of a multi-byte control message frame;
• an encoder for encoding the data frame and forming encoded I/Q symbol pairs;
• a second multiplexer for inserting unencoded I/Q symbol pairs of a frame boundary synchronization field into the encoded I/Q symbol pairs to form a multiplexed I/Q symbol pairs stream;
• a spreader for spreading the multiplexed I/Q symbol pairs stream using one pn spreading code;
• and
• a transmitter for transmitting the spread multiplexed I/Q symbol pairs stream as a frame to the intended SU.

A method for transmitting information in a Code Division Multiple Access communication system, comprising steps of:

• multiplexing data and control information into a data frame having data fields comprised of a plurality of data bytes separated by control message fields each comprised of a single byte of a multi-byte control message frame;
• encoding the data frame;
• inserting unencoded frame boundary synchronization information into the data frame;
• spreading the data frame;
• and
• transmitting the spread data frame to a receiver;
• wherein the unencoded frame boundary synchronization information is inserted in an inverted form at every N frame boundaries to indicate a superframe boundary.

A synchronous CDMA fixed wireless system comprised of a radio base unit (RBU) coupled to a telecommunications network and to a plurality of subscriber units (SUs) that communicate over CDMA radio channels, said RBU comprising:

• a first multiplexer for multiplexing data and control information intended for one SU into a data frame having data fields comprised of a plurality of data bytes separated by a control message field comprised of a single byte of a multi-byte control message frame;
• an encoder for encoding the data frame and forming encoded In-phase channel and Quadrature channel (I/Q) symbol pairs;
• a second multiplexer for inserting unencoded I/Q symbol pairs of a frame boundary synchronization field into the encoded I/Q symbol pairs to form a multiplexed I/Q symbol pairs stream;
• a spreader for spreading the multiplexed I/Q symbol pairs stream using one pn spreading code;
• and
• a transmitter for transmitting the spread multiplexed I/Q symbol pairs stream as a frame to the intended SU,
• wherein the frame boundary synchronization field is inserted in an inverted form at every N frame boundaries to indicate a superframe boundary.