System and method for received channel power indicator (RCPI) measurement
First Claim
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1. A method for determining a received channel power indicator (RCPI), comprising the steps of:
- a) measuring radio frequency (RF) power of a signal received at an antenna;
b) converting the measurement to a given parameter; and
c) scaling the parameter in decibels (dB), to obtain the RCPI value.
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Abstract
A received channel power indicator (RCPI) value is used as a measure of the received RF power in the selected channel, measured at the antenna connector. This parameter is a measure by the PHY sublayer of the received RF power in the channel measured over the PLCP preamble and over the entire received frame. RCPI is a monotonically increasing, logarithmic function of the received power level defined in dBm.
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Citations
35 Claims
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1. A method for determining a received channel power indicator (RCPI), comprising the steps of:
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a) measuring radio frequency (RF) power of a signal received at an antenna;
b) converting the measurement to a given parameter; and
c) scaling the parameter in decibels (dB), to obtain the RCPI value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining a perceived signal to noise indicator for a given wireless station, which is a quantized, comparative measure expressed in decibels (dB) of received signal quality represented by signal to noise plus interference ratio (S/N+I) regardless of channel used for radio transmission and transmission rate comprising:
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determining a relationship between PSNI and signal to noise ratio (Eb/No) by obtaining an observed Eb/No represented by O EbNo, when PSNI=O employing binary phase shift keying (BDSK) at a give data rate;
employing predetermined number of units per dB to obtain a 32 dB range in for a PSNI value represented by a corresponding number of binary bits; and
modifying the PSNI relationship by adding a data rate/modulation (DRMX) value to accommodate a given data rate and modulation and a given hardware factor (CFy) to account for variances in each forward error correction (FEC) decoder in the station. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A receiver capable of determining a received channel power indicator (RCPI), the receiver comprising:
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a radio front end capable of measuring radio frequency (RF) power of a signal received at an antenna;
an AGC circuit for converting the measurement to a given parameter; and
a circuit for scaling the given parameter in decibels (dB), to obtain an RCPI value. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. In a multiuser wireless communications system, a method for scaling received signals, the method comprising:
establishing a perceived signal to noise indicator (PSNI) value, the PSNI value providing a measure of perceived, post-processing signal-to-noise-plus-interference ratio (S/(N+I)) ratio in a demodulator so as to measure in a current received frame at a PHY sublayer a perceived signal quality observed after an RF downconversion, the measurement derived from predetermined internal digital signal prcessing metrics of the demodulator - View Dependent Claims (26, 27, 28, 29)
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30. In a multiuser wireless communications system, a method for scaling received signals, the method comprising:
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receiving a signal and demodulating the signal to at least a physical sublayer; and
establishing a perceived signal to noise indicator (PSNI) value, the PSNI value providing a measure of perceived, post-processing signal-to-noise-plus-interference ratio (S/(N+I)) ratio for the physical sublayer of the demodulated signal, the measurement derived from predetermined internal digital signal processing metrics of the demodulator. - View Dependent Claims (31, 32, 33, 34, 35)
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Specification