US5406629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for digitally processing signals in a radio frequency communication system
Assignee: Motorola Solutions Inc
•
Filing: 1993-12-20
•
Granted: 1995-04-11
•
Expires: 2013-12-20
Abstract
Abstract A plurality of input signals are processed (75) using a Hadamard transform (52) to produce a combined Walsh covered parallel sequence which is sampled in time. The time samples are commutated (76) by a switch (53) or multiplexer to form a Walsh covered serial sequence. The Walsh covered serial sequence is then quadrature phase shift keyed (77) and transmitted (79).
Inventors
- 👤 Robert M. Harrison
- 👤 Terry M. Schaffner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:26
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; G; G06; G06F; G06F17/00; G06F17/10; G06F17/14; G06F17/141; H04B; H04B1/00; H04B1/69; H04B1/707; H04J; H04J13/00; H04J13/0007; H04J13/004; H04J13/0048
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
45 words
A method of digitally processing a plurality of input signals for RF transmission, said method comprising the steps of: performing a Hadamard transform on said plurality of input signals to produce a combined parallel sequence; and commutating said combined parallel sequence to a serial sequence.
Claim 2
Independent Claim
45 words
A method of digitally processing a plurality of input signals for RF transmission, said method comprising the steps of: performing a Hadamard transform on said plurality of input signals to produce a combined parallel sequence; and commutating said combined parallel sequence to a serial sequence.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said Hadamard transform is a fast Hadamard transform.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein said Hadamard transform is a discrete Hadamard transform.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein said step of commutating is performed using one of a multiplexer and a switch.
Claim 6
Independent Claim
39 words
The method of step 1 further comprising, prior to the step of performing a Hadamard transform, the steps of: error correction encoding each of said plurality of input signals; and gain controlling each of said plurality of input signals.
Claim 7
Independent Claim
39 words
The method of step 1 further comprising, prior to the step of performing a Hadamard transform, the steps of: error correction encoding each of said plurality of input signals; and gain controlling each of said plurality of input signals.
Claim 8
Dependent Claim
16 words
The method of claim 5 wherein said error correction encoding is performed by a convolutional encoder.
Claim 9
Dependent Claim
49 words
The method of claim 1 further comprising the steps of: phase shift keying the serial sequence forming a plurality of quadrature binary phase shifted signals; filtering each of said plurality of quadrature binary phase shifted signals creating a plurality of filtered signals; and transmitting said plurality of filtered signals.
Claim 10
Dependent Claim
15 words
The method of claim 7 wherein said phase shift keying is quadrature phase shift keying.
Claim 11
Dependent Claim
19 words
The method of claim 7 wherein said step of filtering is performed by a plurality of low pass filters.
Claim 12
Dependent Claim
61 words
An RF system having a digital combiner comprising: Hadamard transformer means for transforming a plurality of inputs into a plurality of output signals, said Hadamard transformer means having a plurality of inputs each coupled to receive one of a plurality of signals to be transmitted; and commutating means for converting a parallel output of said Hadamard transformer to a serial signal.
Claim 13
Dependent Claim
61 words
An RF system having a digital combiner comprising: Hadamard transformer means for transforming a plurality of inputs into a plurality of output signals, said Hadamard transformer means having a plurality of inputs each coupled to receive one of a plurality of signals to be transmitted; and commutating means for converting a parallel output of said Hadamard transformer to a serial signal.
Claim 14
Dependent Claim
16 words
The digital combiner of claim 10 wherein said Hadamard transformer means is a discrete Hadamard transformer.
Claim 15
Dependent Claim
16 words
The digital combiner of claim 10 wherein said Hadamard transformer means is a fast Hadamard transformer.
Claim 16
Dependent Claim
38 words
The digital combiner of claim 10 wherein said Hadamard transformer means receives said plurality of signals to be transmitted and produces a plurality of time sampled signals representing a combination of said plurality of signals to be transmitted.
Claim 17
Dependent Claim
35 words
The digital combiner of claim 10 wherein said commutating means comprises a switch having a plurality of inputs coupled to said parallel output of said Hadamard transformer means and an output providing said serial signal.
Claim 18
Dependent Claim
13 words
The digital combiner of claim 10 wherein said commutating means is a multiplexer.
Claim 19
Dependent Claim
65 words
The digital combiner of claim 10 further comprising a plurality of gain means, each for adjusting a gain of one of said plurality of signals to be transmitted, said plurality of gain means each having an input coupled to receive one of said plurality of signals to be transmitted and an output coupled to one of said plurality of inputs of said Hadamard transformer means.
Claim 20
Dependent Claim
49 words
An RF system having a digital combiner comprising: a Hadamard transformer having a plurality of inputs each coupled to receive one of a plurality of signals to be transmitted; and a commutator having a parallel input coupled to said parallel output of said Hadamard transformer and a serial output.
Claim 21
Dependent Claim
49 words
An RF system having a digital combiner comprising: a Hadamard transformer having a plurality of inputs each coupled to receive one of a plurality of signals to be transmitted; and a commutator having a parallel input coupled to said parallel output of said Hadamard transformer and a serial output.
Claim 22
Dependent Claim
37 words
The digital combiner of claim 17 wherein said Hadamard transformer receives said plurality of signals to be transmitted and produces a plurality of time sampled signals representing a combination of said plurality of signals to be transmitted.
Claim 23
Dependent Claim
29 words
The digital combiner of claim 17 wherein said commutator comprises a switch having a plurality of inputs coupled to said parallel output of said Hadamard transformer and an output.
Claim 24
Dependent Claim
12 words
The digital combiner of claim 17 wherein said commutator is a multiplexer.
References Cited (Backward Citations)
US4621337A
Cited
US5101501A
Cited
US5109390A
Cited
US5103459A
Cited
US5103459B1
Cited
US5159608A
Cited
US5295153A
Cited
US5224122A
Cited
US5305349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-04-10 | 1998-10-10 | 1999-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-10 | 2002-10-10 | 2003-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-10 | 2006-10-10 | 2007-04-11 | $7700.00 | Window Closed / Lapsed |