US Patent No. 10,117,247

WINDOWING METHODS FOR EFFICIENT CHANNEL AGGREGATION AND DEAGGREGATION


Patent No. 10,117,247
Issue Date October 30, 2018
Title Windowing Methods For Efficient Channel Aggregation And Deaggregation
Inventorship Huaiyu Zeng, Red Bank, NJ (US)
Xiang Liu, Marlboro, NJ (US)
Assignee Futurewei Technologies, Inc., Plano, TX (US)

Claim of US Patent No. 10,117,247

1. A method implemented in a fronthaul communication unit, comprising:applying, via a processor, a frequency-shifting (FS) function to one of a plurality of first communication channel signals in a time domain, wherein the FS function comprises

 where FS1(k) represents the FS function, exp represents an exponential function, j represents a square root of minus one, ? represents the value 3.14159, k represents a time sample index of the one of the plurality of first communication channel signals in a time frame of K samples, and K corresponds to a size of a first discrete Fourier transform (DFT);
performing, via a processor, a plurality of DFTs on the plurality of first communication channel signals;
applying, via a processor of the fronthaul communication unit, a plurality of first frequency-domain windowing (FDW) functions on the plurality of first communication channel signals to produce a plurality of first windowed signals, with the FDW functions comprising a sequence of FDW coefficients, and with a first half of the FDW coefficients being symmetrical to a second half of the FDW coefficients;
aggregating, via the processor, the plurality of first windowed signals to produce a first aggregated signal, wherein aggregating the plurality of first windowed signals comprises performing a frequency-division multiplexing (FDM) on the plurality of first windowed signals; and
transmitting, via a frontend of the fronthaul communication unit, the first aggregated signal to a corresponding fronthaul communication unit over a fronthaul communication link to facilitate fronthaul communication.