Communication system, apparatus and methods

Abstract

A system, method and apparatus for wireless communications are provided. In an exemplary embodiment, frequency components present in a short duration modulated complex pulse is used to represent data to be sent. In other embodiments, the complex pulse is created, modulated, then modified to have desirable frequency characteristics. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

What is claimed is: 
     
         1 . A method of transmitting data from a wireless device, the wireless device comprising an antenna, a processor, and a data source, the method comprising:
 selecting a first sub-set of frequency components from a set of frequencies, the set of frequencies representing a frequency domain representation of a modulated complex pulse;   spreading a first signal characterized by the first subset frequency components with a first code to generate a first spread signal;   selecting a second sub-set of frequency components from the set of frequencies;   spreading a second signal characterized by the second subset of frequency components with a second code;   combining the first signal and the second signal into a combined signal; and   transmitting the combined signal.   
     
     
         2 . The method of  claim 1 , wherein the modulated complex pulse is comprised of an in-phase component and a quadrature-phase component, the components modulated by at least one data symbol. 
     
     
         3 . The method of  claim 2 , wherein the in-phase component and quadrature phase components are modulated by a single data symbol simultaneously. 
     
     
         4 . The method of  claim 2 , where the in-phase component and the quadrature-phase component are modulated individually by separate data symbols. 
     
     
         5 . The method of  claim 1 , wherein the representation of a modulated complex data symbol is a representation of a complex data symbol modulated by a technique selected from a group consisting of: a phase modulation, an amplitude modulation a frequency modulation, and a quadrature-amplitude modulation. 
     
     
         6 . The method of  claim 1 , where the first and the second sub-sets of frequency components are selected to minimize energy in a specific frequency band. 
     
     
         7 . The method of  claim 1 , further comprising spreading the combined signal with a third code prior to transmission. 
     
     
         8 . The method of  claim 7 , wherein the third code is selected from a group consisting of: a PN code, a Walsh code, a gold code and a Golay code. 
     
     
         9 . The method of  claim 1 , wherein transmitting the combined signal comprises a transmission from the antenna in the frequency band from approximately 5 MHz to approximately 1 GHz. 
     
     
         10 . A method of transmitting data from a wireless device, the wireless device comprising an antenna, a processor, a memory, and a data source, the method comprising:
 defining a standard set of waveforms, the waveforms in the standard set each representing a set of frequencies contained within a modulated complex pulse;   storing the standard set of waveforms in a memory;   selecting a first waveform from the standard set of waveforms from the memory, the selection made based on a first data symbol;   spreading the first waveform with a first code to form a first spread waveform;   storing the first spread waveform in an accumulated symbol register;   selecting a second waveform from the standard set of waveforms from memory, the second selection made based on a second data symbol;   spreading the second waveform with a second code to form a second spread waveform;   combining the second spread waveform with the first spread waveform in the accumulated symbol register to form a combined waveform; and   transmitting the combined waveform.   
     
     
         11 . The method of  claim 10 , wherein the modulated complex pulse comprises an in-phase component and a quadrature phase component, the in-phase component having a shape approximately equivalent to (cos(x)/x), the quadrature phase component having a shape approximately equivalent to (sin(x)/x). 
     
     
         12 . The method of  claim 10 , further comprising modifying at least one waveform of the standard set of waveforms prior to storage in memory. 
     
     
         13 . The method of  claim 12 , wherein the modification comprises predistortion of the waveform to account for effects of interference or distortion in a transmission medium. 
     
     
         14 . The method of  claim 12 , wherein the modification comprises changing an amplitude of at least one frequency component of the waveform. 
     
     
         15 . The method of  claim 10 , wherein the modulated complex pulse is a complex pulse modulated by a technique selected from a group consisting of: a binary phase shift keying technique, a quadrature phase shift keying technique, a phase modulation technique, an amplitude modulation technique, and a quadrature-amplitude modulation technique. 
     
     
         16 . The method of  claim 10 , further comprising spreading the first and the second data symbols with a third code and a fourth code prior to selecting first and second waveforms from memory. 
     
     
         17 . The method of  claim 16 , wherein the third and fourth codes are from a set of codes, the set of codes selected from a group consisting of: orthogonal codes, Walsh codes, PN codes, quasi-orthogonal codes, gold codes and Golay codes. 
     
     
         18 . The method of  claim 10 , wherein the first and second codes are from a set of codes, the set of codes selected from a group consisting of: orthogonal codes, Walsh codes, PN codes, quasi-orthogonal codes, gold codes and Golay codes. 
     
     
         19 . The method of  claim 10 , wherein the spreading of the first and the second waveforms comprises an operation selected from a group consisting of: multiplying the first and the second waveforms by the first and the second codes respectively and performing an exclusive or of the first and the second waveforms with the first and the second codes respectively. 
     
     
         20 . The method of  claim 10 , wherein combining the second spread waveform with the first spread waveform comprises an operation selected from a group consisting of: adding the second spread waveform to the first spread waveform and subtracting the second spread waveform from the first spread waveform. 
     
     
         21 . The method of  claim 10 , further comprising upconverting the combined waveform to a transmission frequency band prior to transmission. 
     
     
         22 . The method of  claim 10 , wherein the transmitting combined waveform comprises a transmission from the antenna in the frequency band from approximately 5 MHz to approximately 1 GHz. 
     
     
         23 . The method of  claim 10 , wherein the first and second data symbols substantially overlap in time.