Code division multiple access (CDMA) inbound messaging system utilizing interference cancellation to recover inbound messages
First Claim
1. A method for processing spread spectrum signals in accordance with the strength of received signals in a base station included in a communication system, the method comprising the steps of:
- (a) receiving a first spread spectrum signal comprising a first plurality of signals;
(b) determining the signal strengths of each of the first plurality of signals;
(c) selecting a strongest signal included within the first plurality of signals;
(d) subtracting the strongest signal from the first spread spectrum signal to result in a second spread spectrum signal including a second plurality of signals;
(e) determining the signal strengths of each of the second plurality of signals;
(f) selecting a strongest signal included within the second plurality of signals; and
(g) subtracting the strongest signal from the second spread spectrum signal.
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Accused Products
Abstract
A base station for processing a received and stored spread spectrum signal determines the signal strengths of a first plurality of signals included in the stored spread spectrum signal. The strongest signal of the first plurality is subtracted from the stored signal such that the stored signal is replaced in the memory by a modified spread spectrum signal including a second plurality of signals. The base station determines signal strengths of the second plurality of signals, then subtracts the strongest of the second plurality from the modified spread spectrum signal.
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Citations
19 Claims
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1. A method for processing spread spectrum signals in accordance with the strength of received signals in a base station included in a communication system, the method comprising the steps of:
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(a) receiving a first spread spectrum signal comprising a first plurality of signals; (b) determining the signal strengths of each of the first plurality of signals; (c) selecting a strongest signal included within the first plurality of signals; (d) subtracting the strongest signal from the first spread spectrum signal to result in a second spread spectrum signal including a second plurality of signals; (e) determining the signal strengths of each of the second plurality of signals; (f) selecting a strongest signal included within the second plurality of signals; and (g) subtracting the strongest signal from the second spread spectrum signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A base station for processing a received spread spectrum signal including a first plurality of signals, the base station comprising:
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a memory for storing the received spread spectrum signal; first processing means coupled to the memory for determining signal strengths of the first plurality of signals and for selecting therefrom a strongest signal; first cancellation circuitry coupled to the first processing means and the memory for subtracting the strongest signal of the first plurality of from the received spread spectrum signal stored in the memory, thereby replacing the received spread spectrum signal in the memory with a modified spread spectrum signal including a second plurality of signals, wherein the second plurality of signals is approximately equivalent to the first plurality of signals minus the strongest signal of the first plurality of signals; second processing means coupled to the memory for determining signal strengths of the second plurality of signals and for selecting therefrom a strongest signal; and second cancellation circuitry coupled to the second processing means and the memory for subtracting the strongest signal of the second plurality of signals from the modified spread spectrum signal stored in the memory. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A communication system for providing two-way communication, comprising:
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portable transceivers for generating a plurality of signals in a single time slot; and a base station for receiving a spread spectrum signal comprising the plurality of signals, wherein the base station comprises; first processing means for selecting a strongest of the plurality of signals and subtracting the strongest signal from the spread spectrum signal, thereby replacing the spread spectrum signal with a modified spread spectrum signal including a decreased plurality of signals; and second processing means for selecting a strongest of the decreased plurality of signals and subtracting the strongest signal from the modified spread spectrum signal. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification