System and method for two-dimensional equalization in an orthogonal time frequency space communication system
AssigneeCohere Technologies, Inc.
InventorsRonny Hadani, Shlomo Selim Rakib
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Abstract
A system and method for receiving communication signals that have been spread in two dimensions. The method includes receiving signals representative of data that has been two-dimensionally spread and transmitted over a communication channel. The method further includes processing the signals to determine equalization coefficients based upon a two-dimensional [time-frequency] impulse response of the communication channel. A two-dimensional signal equalization procedure is then performed using the equalization coefficients.
Claims9
A communication device, comprising:
- an antenna;
- a receiver configured to:
- receive, from the antenna, signals representative of data that has been two-dimensionally spread and transmitted over a communication channel;
- process the signals to determine equalization coefficients based upon a two-dimensional impulse response of the communication channel;
- perform a two-dimensional signal equalization procedure using the equalization coefficients;
- and
- a transmitter configured to:
- receive a stream of input data;
- generate two-dimensionally pre-equalized data;
- transmit the pre-equalized data;
- wherein the transmitter is further configured to generate the two-dimensionally pre-equalized data by pre-equalizing the input data in accordance with corrective information relating to echo reflections and frequency shifts present within the communication channel.
A method of receiving communication signals, the method comprising:
- receiving signals representative of data that has been two-dimensionally spread and transmitted over a communication channel;
- processing the signals to determine equalization coefficients based upon a two-dimensional impulse response of the communication channel;
- performing a two-dimensional signal equalization procedure using the equalization coefficients;
- receiving a stream of input data;
- generating two-dimensionally pre-equalized data;
- and
- transmitting the pre-equalized data;
- wherein the generating includes pre-equalizing the input data in accordance with corrective information relating to echo reflections and frequency shifts present within the communication channel.
A communication device, comprising:
- an antenna arrangement;
- and
- a transmitter configured to:
- receive a stream of input data;
- generate two-dimensionally pre-equalized data by pre-equalizing the input data in accordance with corrective information relating to echo reflections and frequency shifts present within a communication channel;
- transmit the pre-equalized data.
A method of providing a modulated signal useable in a signal transmission system, the method comprising:
- transforming a data frame including a plurality of data elements into a two-dimensionally spread data matrix by performing a spreading operation wherein the spread data matrix includes at least N rows and at least M columns, where N and M are positive, non-zero integers greater than one and wherein the transforming includes performing a Fast Fourier Transform (FFT) operation with respect to the plurality of data elements and multiplying a result of the FFT operation in accordance with a Fourier mask;
- filtering each of the at least N rows of the spread data matrix using a filter bank;
- and
- generating the modulated signal in accordance with results of the filtering.
Dependencies are inferred from the claim text.