Method and apparatus for determining signal strength in a variable data rate system
First Claim
1. A method of determining a signal strength of an incoming signal in a system receiving variable rate data wherein said incoming signal is comprised of a series of frames, each frame having a corresponding unknown data rate, each frame comprised of a plurality of data segments wherein the number of said data segments containing data in each frame depends upon said corresponding unknown data rate, said corresponding unknown data rate may correspond to one of at least a highest data rate and a lowest data rate, said method comprising the steps of:
- receiving a first energy value corresponding to a first one of said data segments; and
summing said first energy value with a previously accumulated total if said first one of said data segments corresponds to a data segment containing data at said lowest data rate to produce an estimate of said signal strength.
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Abstract
A method and apparatus of determining signal strength, regardless of the signal data rate, in a receiver receiving signals from a variable rate transmitter. The incoming signal is comprised of a series of frames. Each frame is comprised of a number of power control groups containing data. The number of the power control groups containing data within each frame is dependent on the unknown data rate. The position of the power control groups within the frame is a pseudorandom. The signal strength of an incoming signal of unknown data rate is determined based upon an active set of power control groups within a frame. The active set of power control groups contain data independent of the unknown data rate. This signal strength information may be used to indicate that the signal strength is sufficient to perform further signal processing.
122 Citations
21 Claims
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1. A method of determining a signal strength of an incoming signal in a system receiving variable rate data wherein said incoming signal is comprised of a series of frames, each frame having a corresponding unknown data rate, each frame comprised of a plurality of data segments wherein the number of said data segments containing data in each frame depends upon said corresponding unknown data rate, said corresponding unknown data rate may correspond to one of at least a highest data rate and a lowest data rate, said method comprising the steps of:
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receiving a first energy value corresponding to a first one of said data segments; and summing said first energy value with a previously accumulated total if said first one of said data segments corresponds to a data segment containing data at said lowest data rate to produce an estimate of said signal strength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus providing a signal strength estimate comprising:
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a demodulation element having an output producing a series of symbol energies corresponding to a data signal of an unknown data rate; a summation register having an input coupled to said demodulation element output, having an enable input, and having an output producing a sum of a plurality of said series of symbol energies conditioned upon a signal received by said enable input; an active group clock having an output coupled to said enable input of said summation register, said output producing an indication of a group of said series of symbol energies corresponding to symbols containing data independent of said unknown data rate of said data signal; a first-in-first-out storage register having an input coupled to said summation register output and having a plurality of outputs each producing an indication of a previous value of said sum at said output of said summation register; and an adder having a plurality of inputs coupled to each of said plurality of outputs of said first-in-first-out storage register and having an output producing said signal strength indication.
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18. An apparatus for determining a signal strength of an incoming signal in a system receiving variable rate data wherein said incoming signal is comprised of a series of frames, each frame having a corresponding unknown data rate, each frame comprised of a plurality of data segments wherein the number of said data segments containing data in each frame depends upon said corresponding unknown data rate, said corresponding unknown data rate may correspond to one of at least a highest data rate and a lowest data rate, said method comprising the steps of:
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means for receiving a first energy value corresponding to a first one of said data segments; and means for summing said first energy value with a previously accumulated total if said first one of said data segments corresponds to a data segment containing data at said lowest data rate to produce an estimate of said signal strength. - View Dependent Claims (19, 20, 21)
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Specification