MRC antenna diversity for FM IBOC digital signals

A signal and antenna technology, applied in the field of MRC antenna diversity for FM IBOC digital signals, which can solve problems such as degraded digital performance

Active Publication Date: 2014-07-30
IBIQUITY DIGITAL CORP
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, the use of switched diversity antennas introduces sharp transitions in the coherent tracking of digital signals, which degrades digital performance

Method used

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  • MRC antenna diversity for FM IBOC digital signals
  • MRC antenna diversity for FM IBOC digital signals
  • MRC antenna diversity for FM IBOC digital signals

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Embodiment Construction

[0030] At the cost of adding a second digital receive path (from tuner to baseband), Maximum Ratio Combining (MRC) of the Viterbi Branch Metric (VBM) can provide improved Signal-to-Noise Ratio (SNR) performance. MRC receivers operate at lower SNRs than single receivers, and acquisition and tracking algorithms designed for single receivers may not operate efficiently at these lower SNRs than single demodulators. Furthermore, if one of the demodulators outputs corrupted Viterbi branch metrics (due to poor antenna signals) while the other demodulates correctly, contamination is possible, which degrades the performance of the combination.

[0031] This document describes various techniques for achieving maximum ratio combining in antenna diversity systems. This technique is suitable for the processing of OFDM signals for HD Radio FM IBOC radio systems. In the embodiments described herein, MRC involves the combination of Viterbi branch metrics (derived from demodulated symbols) fr...

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Abstract

A radio receiver includes a first signal path including a first tuner configured to receive a first signal from a first antenna, and a first demodulator configured to demodulate symbols from an output of the first tuner to produce first branch metrics derived from the demodulated symbols; a second signal path including a second tuner configured to receive a second signal from a second antenna, and a second demodulator configured to demodulate symbols from an output of the second tuner to produce second branch metrics derived from the demodulated symbols; a combiner for maximum ratio combining the first branch metrics and the second branch metrics; and processing circuitry to process the combined first and second branch metrics to produce an output signal.

Description

Background technique [0001] HD Radio by iBiquity Digital TM The system is designed to allow a smooth evolution from today's analog amplitude modulation (AM) and frequency modulation (FM) radios to fully digital in-band on-band (IBOC) systems. Such systems deliver digital audio and data services from terrestrial transmitters to mobile, portable and fixed receivers in existing medium frequency (MF) and very high frequency (VHF) radio bands. In parallel with the new higher quality and more robust digital signals, broadcasters can continue to send analog AM and FM, allowing themselves and their listeners to switch from analog to digital radio while maintaining their current frequency allocations. An example of a waveform for an FM HD radio system is shown in US Patent No. 7,724,850, which is hereby incorporated by reference. [0002] Various antenna diversity techniques have been developed and deployed for use with vehicle FM receivers. They are used to mitigate the effects of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/08
CPCH04B7/0845H04B7/0885H04H2201/18H04B7/0857
Inventor B·克罗格P·J.·皮拉J·S.·白尔德
Owner IBIQUITY DIGITAL CORP
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