Wireless communication apparatus using fast fourier transforms to create, optimize and incorporate a beam space antenna array in an orthogonal frequency division multiplexing receiver

An integrated circuit (IC) configured to perform fast Fourier transforms (FFTs) on received signals so as to separate spatial beams derived from the received signals and process each beam independently, wherein the number of spatial beams is N, the IC comprising:

• a first stage FFT processor configured to perform at least one FFT function on the received signals and output the N separate spatial beams;
• N serial-to-parallel (S/P) converters, each S/P converter being configured to receive a respective one of the separate spatial beams;
• N second stage FFT processors in communication with respective ones of the plurality of S/P converters;
• and
• a parallel-to-serial (P/S) converter in communication with each of the second stage FFT processors, wherein the P/S converter is configured to output a data stream based on beam signals processed by each of the second stage FFT processors.

An wireless transmit/receive unit (WTRU) used to perform fast Fourier transforms (FFTs) on received signals so as to separate spatial beams derived from the received signals and process each beam independently, wherein the number of spatial beams is N, the WTRU comprising:

• a first stage FFT processor configured to perform at least one FFT function on the received signals and output the N separate spatial beams;
• N serial-to-parallel (SIP) converters, each S/P converter being configured to receive a respective one of the separate spatial beams;
• N second stage FFT processors in communication with respective ones of the plurality of S/P converters;
• and
• a parallel-to-serial (P/S) converter in communication with each of the second stage FFT processors, wherein the P/S converter is configured to output a data stream based on beam signals processed by each of the second stage FFT processors.

A receiver used to perform fast Fourier transforms (FFTs) on received signals so as to separate spatial beams derived from the received signals and process each beam independently, wherein the number of spatial beams is N, the receiver comprising:

• a first stage FFT processor configured to perform at least one FFT function on the received signals and output the N separate spatial beams;
• N serial-to-parallel (SJP) converters, each S/P converter being configured to receive a respective one of the separate spatial beams;
• N second stage FFT processors in communication with respective ones of the plurality of S/P converters;
• and
• a parallel-to-serial (PIS) converter in communication with each of the second stage FFT processors, wherein the P/S converter is configured to output a data stream based on beam signals processed by each of the second stage FFT processors.

A base station used to perform fast Fourier transforms (FFTs) on received signals so as to separate spatial beams derived from the received signals and process each beam independently, wherein the number of spatial beams is N, the base station comprising:

• a first stage FFT processor configured to perform at least one FFT function on the received signals and output the N separate spatial beams;
• N serial-to-parallel (SIP) converters, each S/P converter being configured to receive a respective one of the separate spatial beams;
• N second stage FFT processors in communication with respective ones of the plurality of S/P converters;
• and
• a parallel-to-serial (P/S) converter in communication with each of the second stage FFT processors, wherein the P/S converter is configured to output a data stream based on beam signals processed by each of the second stage FFT processors.