Adaptive multi-channel modem
First Claim
1. An apparatus comprising:
- an adjustable filter operative to filter an input signal with an adjustable bandwidth and to provide an output signal comprising a selected number of spread spectrum signals; and
a digital processor operative to process samples generated from the output signal for each spread spectrum signal among the selected number of spread spectrum signals.
1 Assignment
0 Petitions
Accused Products
Abstract
An adaptive multi-channel (AMC) modem that can receive one or multiple spread spectrum signals simultaneously includes an adjustable filter, a ΔΣ ADC, and a digital processor. The adjustable filter filters an input signal with an adjustable bandwidth and provides an output signal comprised of a selected number of spread spectrum signals. The ΔΣ ADC digitizes the output signal and provides data samples. The sampling rate and/or the reference voltage of the ΔΣ ADC may be varied to obtain the desired performance. The digital processor processes the data samples for each spread spectrum signal to recover data sent in that signal. A controller ascertains the operating conditions (e.g., the desired signal level, the undesired signal level, and so on) and selects the number of spread spectrum signals to receive based on the operating conditions, user requirements, and possibly other factors.
-
Citations
37 Claims
-
1. An apparatus comprising:
-
an adjustable filter operative to filter an input signal with an adjustable bandwidth and to provide an output signal comprising a selected number of spread spectrum signals; and
a digital processor operative to process samples generated from the output signal for each spread spectrum signal among the selected number of spread spectrum signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. An apparatus comprising:
-
means for determining operating conditions for a plurality of spread spectrum signals;
means for selecting a particular number of spread spectrum signals for simultaneous reception based on the operating conditions;
means for setting a filter bandwidth based on the selected number of spread spectrum signals;
means for filtering an input signal with the filter bandwidth to obtain an output signal; and
means for processing samples generated from the output signal for each spread spectrum signal among the selected number of spread spectrum signals. - View Dependent Claims (21, 22, 23, 24)
-
-
25. A method of receiving data in a wireless communication system, comprising:
-
determining operating conditions for a plurality of spread spectrum signals;
selecting a particular number of spread spectrum signals for simultaneous reception based on the operating conditions;
setting a filter bandwidth based on the selected number of spread spectrum signals;
filtering an input signal with the filter bandwidth to obtain an output signal; and
processing samples generated from the output signal for each spread spectrum signal among the selected number of spread spectrum signals. - View Dependent Claims (26, 27, 28)
-
-
29. An apparatus comprising:
-
a delta-sigma analog-to-digital converter (Δ
Σ
ADC) operative to digitize an input analog signal to generate samples; and
a controller operative to determine operating conditions for at least one spread spectrum signal and to select a sampling rate, a reference voltage, or both the sampling rate and the reference voltage for the Δ
Σ
ADC based on the operating conditions. - View Dependent Claims (30, 31, 32, 33)
-
-
34. An apparatus comprising:
-
a controller operative to select a particular number of spread spectrum signals to receive simultaneously based on operating conditions, user requirements, or a combination thereof, wherein different numbers of spread spectrum signals are selectable during a call; and
a receiver unit operative to process an input signal and provide an output signal comprising the selected number of spread spectrum signals. - View Dependent Claims (35)
-
-
36. An apparatus comprising:
-
a controller operative to select at least two spread spectrum signals for at least two services to be received concurrently;
a receiver unit operative to process an input signal and provide an output signal comprising the at least two spread spectrum signals; and
a processor operative to process samples generated from the output signal for each of the at least two spread spectrum signals. - View Dependent Claims (37)
-
Specification