Systems and methods for time domain layer separation in orthogonal frequency division multiplexing-based receivers

A receiver circuit for separating a plurality of layers multiplexed using frequency domain orthogonal cover codes (FD-OCC) in an orthogonal frequency domain multiplexed (OFDM) signal, the receiver circuit comprising:

• a descrambling sub-circuit configured to descramble a plurality of signals received on non-adjacent subcarriers of the OFDM signal based on multiplying the plurality of signals by corresponding descrambling codes to generate a plurality of descrambled signals;
• an inverse fast Fourier transform sub-circuit configured to transform the plurality of descrambled signals from a frequency domain to a received signal comprising a plurality of samples in a time domain;
• and
• a layer separation sub-circuit configured to separate the plurality of layers multiplexed in the received signal by extracting, in the time domain:
• one or more first layers from the samples;
• and
• one or more second layers from the samples.

A wireless communication device comprising:

• an antenna;
• a processor;
• a memory;
• a plurality of signal processing circuits coupled to the processor and the memory by a data bus, the signal processing circuits comprising a receiver circuit configured to receive a plurality of layers multiplexed using frequency domain orthogonal cover codes (FD-OCC) in an orthogonal frequency domain multiplexed (OFDM) signal from the antenna, the receiver circuit comprising:
• a descrambling sub-circuit configured to descramble a plurality of signals received on non-adjacent subcarriers of the OFDM signal based on multiplying the plurality of signals by corresponding descrambling codes to generate a plurality of descrambled signals;
• an inverse fast Fourier transform sub-circuit configured to transform the plurality of descrambled signals from a frequency domain to a received signal comprising a plurality of samples in a time domain;
• a layer separation sub-circuit configured to separate the plurality of layers multiplexed in the received signal by extracting, in the time domain:
• one or more first layers from the samples;
• and
• one or more second layers from the samples,
• the signal processing circuits being configured to transmit data streams decoded from the one or more first layers and the one or more second layers to the processor and the memory.