SYSTEMS, METHODS AND TRANSCEIVERS FOR WIRELESS COMMUNICATIONS OVER DISCONTIGUOUS SPECTRUM SEGMENTS
First Claim
1. A method of transmitting a plurality of communications signals over a plurality of discontiguous bandwidth segments in a frequency band, comprising:
- defining a plurality (NFFT) of orthogonal subcarriers across the frequency band;
defining a plurality (N) of available physical subcarriers from among the orthogonal subcarriers, wherein the available physical subcarriers are distributed among the plurality of discontiguous bandwidth segments;
receiving M data symbols for each of K users;
spreading the data symbols of each user by an L-bit spreading code associated with the user to provide M spread data symbols for each of the K users;
combining mth data symbols associated with each of the K users to provide M composite data signals;
converting the M composite data signals to parallel input signals having a length L;
interleaving the M parallel input signals to provide Q interleaved input signals having a length N;
assigning the Q interleaved input signals to the N available physical subcarriers; and
transmitting the Q interleaved input signals on the N available physical subcarriers.
16 Assignments
0 Petitions
Accused Products
Abstract
Methods of transmitting a plurality of communications signals over a plurality of discontiguous bandwidth segments in a frequency band include defining a plurality (NFFT) of orthogonal subcarriers across the frequency band, defining a plurality (N) of available physical subcarriers from among the orthogonal subcarriers. The available physical subcarriers are distributed among the plurality of discontiguous bandwidth segments. The methods further include multiplexing the plurality of communications signals onto the plurality of available physical subcarriers. Multiplexing the plurality of communications signals onto the plurality of available physical subcarriers may include assigning the communications signals to respective ones of a plurality (N) of logical subcarriers, and mapping the plurality of logical subcarriers to corresponding ones of the plurality of available physical subcarriers. Related transmitters, receivers and communications systems are also disclosed.
45 Citations
46 Claims
-
1. A method of transmitting a plurality of communications signals over a plurality of discontiguous bandwidth segments in a frequency band, comprising:
-
defining a plurality (NFFT) of orthogonal subcarriers across the frequency band; defining a plurality (N) of available physical subcarriers from among the orthogonal subcarriers, wherein the available physical subcarriers are distributed among the plurality of discontiguous bandwidth segments; receiving M data symbols for each of K users; spreading the data symbols of each user by an L-bit spreading code associated with the user to provide M spread data symbols for each of the K users; combining mth data symbols associated with each of the K users to provide M composite data signals; converting the M composite data signals to parallel input signals having a length L; interleaving the M parallel input signals to provide Q interleaved input signals having a length N; assigning the Q interleaved input signals to the N available physical subcarriers; and transmitting the Q interleaved input signals on the N available physical subcarriers. - View Dependent Claims (2)
-
-
3. A transmitter for a wireless communications system, comprising:
-
a subcarrier mapper configured to receive a plurality of input symbols, configured to assign the plurality of input symbols to N logical subcarriers, configured to map the N logical subcarriers to N available physical subcarriers out of NFFT physical subcarriers, and configured to generate NFFT transmit symbols corresponding to the NFFT physical subcarriers; an inverse fast fourier transform (IFFT) processor configured to perform an inverse fourier transform on the NFFT transmit symbols output by the subcarrier mapper; and a parallel to serial converter configured to convert an output of the IFFT processor to a serial output stream. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. A transmitter for transmitting a plurality of communications signals over a plurality of discontiguous bandwidth segments in a frequency band, comprising:
-
a plurality of spreaders configured to spread M data symbols for each of K users according to a corresponding spreading code having length L; a plurality of combiners configured to combine the mth data symbols for each of the K users to provide M composite spread signals; a plurality of serial to parallel converters configured to convert the M composite spread signals to M parallel input signals; a frequency interleaver configured to interleave the M parallel input signals to provide Q interleaved input signals having a length N; a subcarrier mapper configured to assign the Q interleaved input signals to the N available physical subcarriers; and an inverse fast fourier transform (IFFT) processor configured to modulate N available physical subcarriers with the Q interleaved input signals. - View Dependent Claims (23)
-
-
24. A receiver for a wireless communications system, comprising:
-
a serial to parallel converter configured to convert a received symbol stream to an NFFT symbol wide parallel received symbol stream; a fast fourier transform (FFT) processor configured to perform an NFFT-point fourier transform on the parallel received symbol stream and to generate received symbols corresponding to NFFT subcarriers; and a subchannel demapper configured to select N symbols of the received symbols corresponding to the NFFT subcarriers, wherein the N selected symbols correspond to N available physical subcarriers out of the NFFT subcarriers, and configured to reconstruct a transmit data stream associated with the receiver from the N selected symbols. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
-
-
35. A communications system, comprising:
-
a transmitter comprising; a subcarrier mapper configured to receive a plurality of input symbols, configured to assign the plurality of input symbols to N logical subcarriers, configured to map the N logical subcarriers to N available physical subcarriers out of NFFT physical subcarriers, and configured to generate NFFT transmit symbols corresponding to the NFFT physical subcarriers; an inverse fast fourier transform (IFFT) processor configured to perform an inverse fourier transform on the NFFT transmit symbols output by the subcarrier mapper; and a parallel to serial converter configured to convert an output of the IFFT processor to a serial output stream; and a receiver comprising; a serial to parallel converter configured to convert a received symbol stream to an NFFT symbol wide parallel received symbol stream; a fast fourier transform (FFT) processor configured to perform an NFFT-point fourier transform on the parallel received symbol stream and to generate received symbols corresponding to NFFT subcarriers; and a subchannel demapper configured to select N symbols of the received symbols corresponding to the NFFT subcarriers, wherein the N selected symbols correspond to N available physical subcarriers out of the NFFT subcarriers, and configured to reconstruct a transmit data stream associated with the receiver from the N selected symbols. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
-
Specification