Method for correcting DC offsets in a receiver
First Claim
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1. A communication system wherein information is transmitted through a channel having a discrete channel impulse response h(k), where k is a time index, to produce at an output of the channel, a signal, r(k), where:
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where;
A is DC offset;
is a modulated signal transmitted over the channel;
b(n) are transmitted data symbols; and
N(k) is additive noise. such system comprising;
a receiver for receiving the transmitted information, such receiver having a processor programmed to solve the following equations simultaneously;
where;
f(e(k)) is a function of the estimation error quadratic, e(k), where
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Abstract
A method for reducing DC offset from a receiver signal. The method includes jointly (i.e., simultaneously) estimating such DC offset and channel impulse response, and reducing the DC offset in accordance with the estimated DC offset and the estimate of the channel impulse response.
72 Citations
5 Claims
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1. A communication system wherein information is transmitted through a channel having a discrete channel impulse response h(k), where k is a time index, to produce at an output of the channel, a signal, r(k), where:
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where; A is DC offset;
is a modulated signal transmitted over the channel;
b(n) are transmitted data symbols; and
N(k) is additive noise. such system comprising;
a receiver for receiving the transmitted information, such receiver having a processor programmed to solve the following equations simultaneously;
where;
f(e(k)) is a function of the estimation error quadratic, e(k), where
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2. A communication system wherein information is transmitted through a channel as a series of bursts, each burst having a predetermined series of bits and a series of information bits, such system comprising:
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a receiver for receiving the transmitted information, such receiving having a processor programmed to simultaneously solve the following equations from;
(a) the predetermined series of bits;
(b) a tentative decision of the information bits;
or, a combination of the predetermined series of bits and the tentative decision of the information bits;
where;
f(e(k)) is a function of the estimation error, e(k), where e(k) is the difference between the received signal and an estimate of the received signal;
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3. A method for reducing DC offset from a receiver signal, comprising:
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storing received burst samples, r(k) in a memory;
simultaneously computing;
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4. A method for determining DC offset in a receiver, comprising:
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receiving burst of samples, r(n);
storing the received burst samples, r(n) in a memory;
calculating an initial DC offset, A(0), from the stored received samples as the average value over the burst of samples;
subtracting the initial DC offset, A(0), from the stored received burst to produce r(n)−
A(0);
calculating an error function, e(n)=r(n)−
{right arrow over (h)}H(n){right arrow over (b)}(n)−
A(n);
updating the DC offset value, A(n+1)=A(n)+μ
e(n);
updating a channel impulse response in accordance with {right arrow over (h)}(n+1)={right arrow over (h)}(n)+μ
{right arrow over (b)}(n)e*(n);
computing the computed DC offset A(n+1) and channel impulse response {right arrow over (h)}(n+1) until the end of the burst.
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5. A method for determining DC offset in a receiver, such receiver receiving a burst comprising a known series of bits and information bits, such receiver comprising:
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storing the received burst samples, r(k), in a memory;
calculating an initial DC offset, A(0), from the stored received samples as the average value over the burst;
subtracting the initial DC offset, A(0), is subtracted from the stored received burst;
updating a channel impulse response updating a DC offset value over a from the known series of bits in the stored received samples, or over the entire burst, in accordance with;
making a determination as to whether a required iterations, P, has been performed and, if not, the method continues to update the estimated channel impulse response and DC offset values; and
if it has been performed, the computed DC offset and channel impulse response processed by the receiver.
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Specification
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Current AssigneeMediaTek, Inc.
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Original AssigneeAnalog Devices, Inc.
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InventorsZvonar, Zoran
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Primary Examiner(s)Pham, Chi
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Assistant Examiner(s)Nguyen, Dung X.
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Application NumberUS09/310,612Time in Patent Office1,336 DaysField of Search375/346, 375/263, 375/285US Class Current375/346CPC Class CodesH04L 25/0212 of impulse responseH04L 25/0228 with direct estimation from...H04L 25/0242 using matrix methodsH04L 25/025 using least-mean-square [LM...H04L 25/061 providing hard decisions on...
