Communication signal equalization systems and methods
First Claim
1. A method of equalizing a CDMA signal received over a multipath communication channel, the CDMA signal having a data portion and a known portion comprising a known or repeated data sequence and representing a linear convolution between the multipath channel and a transmitted CDMA signal, the method comprising:
- determining from the known portion a channel estimate of the communication channel;
translating the CDMA signal into a new CDMA signal which comprises a cyclic convolution with the channel estimate; and
adjusting a frequency domain representation of the new CDMA signal using the channel estimate to produce a frequency domain representation of an equalized signal.
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Accused Products
Abstract
Communication signal equalization methods and systems are disclosed. A CDMA signal having a data portion and a known portion including a known or repeated data sequence and received over a multipath communication channel represents a linear convolution between the multipath channel and a transmitted CDMA signal. A channel estimate of the communication channel is determined from the known portion, and the CDMA signal is translated into a new CDMA signal which is a cyclic convolution with the channel estimate. A frequency domain representation of the new CDMA signal is adjusted using the channel estimate to produce a frequency domain representation of an equalized signal.
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Citations
52 Claims
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1. A method of equalizing a CDMA signal received over a multipath communication channel, the CDMA signal having a data portion and a known portion comprising a known or repeated data sequence and representing a linear convolution between the multipath channel and a transmitted CDMA signal, the method comprising:
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determining from the known portion a channel estimate of the communication channel;
translating the CDMA signal into a new CDMA signal which comprises a cyclic convolution with the channel estimate; and
adjusting a frequency domain representation of the new CDMA signal using the channel estimate to produce a frequency domain representation of an equalized signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A communication signal processing method comprising:
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multiplexing a data portion and a known portion comprising a known or repeated data sequence into a CDMA signal; and
outputting the CDMA signal for transmission to a receiver over a multipath communication channel and equalization at the receiver by determining from the known portion a channel estimate of the communication channel, translating the CDMA signal into a new CDMA signal which comprises a cyclic convolution with the channel estimate, and adjusting a frequency domain representation of the new CDMA signal using the channel estimate to produce a frequency domain representation of an equalized signal. - View Dependent Claims (26)
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27. A system for equalizing a portion of a CDMA signal received over a multipath communication channel, the CDMA signal having a data portion and a known portion comprising a known or repeated data sequence and representing a linear convolution between the multipath channel and a transmitted CDMA signal, the system comprising:
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an input; and
a processor configured to receive the CDMA signal from the input, to determine from the known portion a channel estimate of the communication channel, to translate the CDMA signal into a new CDMA signal which comprises a cyclic convolution with the channel estimate, and to adjust a frequency domain representation of the new CDMA signal using the channel estimate to produce a frequency domain representation of an equalized signal. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A communication signal processing system comprising:
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an input for receiving data to be transmitted; and
a processor configured to receive the data from the input, to multiplex the data and a known or repeated data sequence into a CDMA signal to form a data portion and a known portion, and to output the CDMA signal for transmission to a receiver over a multipath communication channel and equalization at the receiver by determining from the known portion a channel estimate of the communication channel, translating the CDMA signal into a new CDMA signal which comprises a cyclic convolution with the channel estimate, and adjusting a frequency domain representation of the new CDMA signal using the channel estimate to produce a frequency domain representation of an equalized signal. - View Dependent Claims (47)
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48. A CDMA communication system comprising:
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communication equipment comprising a processor configured to receive from an input data to be transmitted, to multiplex the data and a known or repeated data sequence into a CDMA signal to form a data portion and a known portion, and to output the CDMA signal for transmission; and
communication equipment comprising a processor configured to receive the CDMA signal over a multipath communication channel, to determine from the known portion a channel estimate of the communication channel, to translate the CDMA signal into a new CDMA signal which comprises a cyclic convolution with the channel estimate, and to adjust a frequency domain representation of the new CDMA signal using the channel estimate to produce a frequency domain representation of an equalized signal. - View Dependent Claims (49, 50, 51, 52)
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Specification