System and method using high performance preamble cover sequences for multi-band OFDM two-band hopping modes

A transmitter for a multiband packet communication system, comprising:

• an encoder for encoding a stream of bits pursuant to a forward error correction scheme;
• an interleaver for interleaving the coded bits;
• a mapper for mapping the interleaved bits into frequency-domain symbols;
• a transform block for converting frequency-domain symbols from the mapper to a time-domain representation;
• a preamble generator for producing packet preambles by multiplying a repeated base sequence by a cover sequence C, wherein C is represented by the sequence {+1 +1 −1 −1 +1 +1 −1−1 +1 +1 −1 −1 +1 +1 −1 −1 +1 +1 +1 +1 +1 +1 −1 −1} or the sequence {+1 +1 −1 −1 +1 +1 +1 +1 +1 +1−1, −1};a guard generator producing null intervals;
• a filter configured to receive samples from the transform block, the preamble generator, and the guard generator and to modify a characteristic of the samples;
• a digital-to-analog converter for converting the filtered samples to an analog signal;
• and
• an upconverter for modulating the analog signal by a carrier frequency.

A method of transmitting packet preamble sequences, comprising:

• producing a base sequence;
• multiplying each of a sequence of repetitions of the base sequence by elements of a cover sequence C to produce a preamble sequence, wherein C is represented by the sequence {+1 +1−1 −1 +1 +1 −1 −1 +1 +1 −1 −1 +1 +1 −1 −1 −1 +1 +1 +1 +1 +1 −1 −1} or the sequence {+1 +1 −1 −1 +1 +1 +1 +1 +1 +1 −1 −1};
• and
• transmitting the preamble sequence.

A method of detecting packet preamble sequences for a multiband packet communication system, comprising:

• receiving a plurality of symbols;
• detecting base sequences in the received symbols;
• correlating the detected base sequences with a cover sequence C, wherein C is represented by the sequence {+1 +1 −1 −1 +1 +1 −1 −1 +1 +1 −1 −1 +1 +1 −1 −1 +1 +1 +1 +1 +1 +1 −1−1} or the sequence {+1 +1 −1 −1 +1 +1 +1 +1 +1 +1 −1 −1};
• and
• signaling reception of a preamble sequence if the correlation is sufficient.

A receiver for a multiband packet communication system, comprising:

• a radio frequency downconverter receiving a radio frequency signal and producing a baseband signal;
• an analog-to-digital converter for converting the baseband signal to digital samples;
• and
• a signal processing block for receiving the digital samples and detecting a preamble sequence, where the preamble sequence comprises a base sequence multiplied by a cover sequence C, wherein C is represented by the sequence {+1 +1 −1 −1 +1 +1 −1 −1 +1 +1 −1 −1 +1 +1−1 −1 +1 +1 +1 +1 +1 +1 −1 −1} or the sequence {+1 +1 −1 −1 +1 +1 +1 +1 +1 +1 −1 −1}.