Compression of signals in base transceiver systems
First Claim
1. In a base transceiver system of a wireless communication network, a method for transferring signal data from a radio frequency (RF) unit to a base station processor over a serial data link, wherein the RF unit is coupled to an antenna to receive an analog signal modulated based on communication data and includes an analog-to-digital converter (ADC) that converts the analog signal to a plurality of signal samples, wherein the base station processor performs signal processing operations on the signal samples received from the RF unit, the method comprising:
- compressing the signal sample output from the ADC at the RF unit to form compressed samples in accordance with a compression control parameter, including calculating a sum or difference of a pair of signal samples separated by a predetermined number of sample intervals in accordance with the compression control parameter to produce a modified sample, wherein a plurality of modified samples is calculated from a plurality of pairs of signal samples; and
encoding the modified samples to form the compressed samples;
formatting the compressed samples for transfer over the serial data link;
transferring the compressed samples over the serial data link from the RF unit to the base station processor;
receiving the compressed samples at the base station processor; and
decompressing the compressed samples to form decompressed signal samples in accordance with a decompression control parameter, wherein the base station processor applies the signal processing operations to the decompressed signal samples.
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Accused Products
Abstract
A signal compression method and apparatus for a base transceiver system (BTS) in a wireless communication network provides efficient transfer of compressed signal samples over serial data links in the system. For the uplink, an RF unit of the BTS compresses signal samples resulting from analog to digital conversion of an analog signal received via an antenna. The RF unit transfers the compressed signal samples over the serial data link to the base station processor where they are decompressed prior to the normal signal processing operations. For the downlink, the base station processor compresses signal samples and transfers the compressed signal samples over the serial data link to the RF unit. The RF unit decompresses the compressed samples and converts the decompressed samples to an analog signal for transmission over an antenna. Compression and decompression can be incorporated into operations of conventional base stations and distributed antenna systems.
112 Citations
50 Claims
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1. In a base transceiver system of a wireless communication network, a method for transferring signal data from a radio frequency (RF) unit to a base station processor over a serial data link, wherein the RF unit is coupled to an antenna to receive an analog signal modulated based on communication data and includes an analog-to-digital converter (ADC) that converts the analog signal to a plurality of signal samples, wherein the base station processor performs signal processing operations on the signal samples received from the RF unit, the method comprising:
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compressing the signal sample output from the ADC at the RF unit to form compressed samples in accordance with a compression control parameter, including calculating a sum or difference of a pair of signal samples separated by a predetermined number of sample intervals in accordance with the compression control parameter to produce a modified sample, wherein a plurality of modified samples is calculated from a plurality of pairs of signal samples; and
encoding the modified samples to form the compressed samples;formatting the compressed samples for transfer over the serial data link; transferring the compressed samples over the serial data link from the RF unit to the base station processor; receiving the compressed samples at the base station processor; and decompressing the compressed samples to form decompressed signal samples in accordance with a decompression control parameter, wherein the base station processor applies the signal processing operations to the decompressed signal samples. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. In a base transceiver system of a wireless communication network, a method for transferring signal samples representing communication data from a base station processor to an RF unit over a serial data link, the RF unit having a digital-to-analog converter (DAC) for converting the signal samples to an analog signal, wherein the RF unit is coupled to an antenna to transmit the analog signal, wherein the base station processor performs signal processing operations on the signal samples, the method comprising:
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compressing the signal samples at the base station processor to form compressed samples in accordance with a compression control parameter, including calculating a sum or difference of a pair of signal samples separated by a predetermined number of sample intervals in accordance with the compression control parameter to produce a modified sample, wherein a plurality of modified samples is calculated from a plurality of pairs of signal samples; and
encoding the modified samples to form the compressed samples;formatting the compressed samples for transfer over the serial data link; transferring the compressed samples over the serial data link from the base station processor to the RF unit; receiving the compressed samples at the RF unit; and decompressing the compressed samples to form decompressed signal samples in accordance with a decompression control parameter, wherein the decompressed signal samples are provided to the DAC for conversion to the analog signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. In a base transceiver system of a wireless communication network, including an RF unit coupled to an antenna to receive an analog signal modulated based on communication data and a base station processor coupled to the RF unit by a serial data links, the RF unit including an analog-to-digital converter (ADC) for converting the analog signal into a plurality of signal samples, wherein the base station processor performs signal processing operations on the signal samples received from the RF unit, an apparatus for data transfer from the RF unit to the base station processor, comprising:
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a compressor at the RF unit coupled to receive the signal samples from the ADC and producing compressed samples in accordance with a compression control parameter, wherein the compressor further comprises an arithmetic operator that add or subtracts a pair of signal samples in accordance with the compression control parameter to form a modified sample, wherein the signal samples in the pair are separated by a predetermined number of sample intervals, the arithmetic operator calculating a plurality of modified samples from a plurality of pairs of signal samples; and
an encoder applied to the modified samples to produce the compressed samples;a formatter coupled to the compressor and formatting the compressed samples for transfer over the serial data link; the serial data link coupled to the formatter for transferring the compressed samples to the base station processor; the base station processor coupled to the serial data link to receive the compressed samples; and a decompressor integrated into the base station processor for decompressing the received compressed samples to form decompressed signal samples, wherein the base station processor applies the signal processing operations to the decompressed signal samples. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. In a base transceiver system of a wireless communication network, including a radio frequency (RF) unit coupled to an antenna to transmit an analog signal and a base station processor coupled to the RF unit by a serial data links, the base station processor providing a plurality of signal samples representing communication data to the RF unit, the RF unit including a digital-to-analog converter (DAC) for converting the plurality of signal samples to the analog signal, wherein the base station processor performs signal processing operations on the signal samples, an apparatus for data transfer from the base station processor to the RF unit, comprising:
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a compressor integrated into the base station processor for compressing the signal samples in accordance with a compression control parameter to form compressed samples, wherein the compressor further comprises an arithmetic operator that add or subtracts a pair of signal samples in accordance with the compression control parameter to form a modified sample, wherein the signal samples in the pair are separated by a predetermined number of sample intervals, the arithmetic operator calculating a plurality of modified samples from a plurality of pairs of signal samples; and
an encoder applied to the modified samples to produce the compressed samples;a formatter coupled to the compressor and formatting the compressed samples for transfer over the serial data link; the serial data link coupled to the formatter for transferring the compressed samples to the RF unit; the RF unit coupled to the serial data link to receive the compressed samples; and a decompressor integrated into the RF unit for decompressing the received compressed samples to form decompressed signal samples, wherein the decompressed signal samples are provided to the DAC for conversion to the analog signal. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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Specification