Receiver Single Equalizer Merging STTD and Closed Loop Diversity
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Solution Overview
Problem
HSDPA receivers require complex and power-inefficient designs with multiple equalizers to accurately recover both the CPICH and HS-DSCH signals, due to the use of different transmit diversity schemes, leading to increased component count and cost.
Innovation Solution
A receiver design that uses a single equalizer to equalize signals transmitted using a closed loop transmit diversity scheme, combined with a processor to reconstruct the pilot signal from the equalized signal, reducing the need for separate equalizers and simplifying the architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate equalizers are used to equalize STTD encoded CPICH signals transmitted through separate propagation channels, then accurate recovery of CPICH is achieved, but device complexity and power consumption increase
Solution Approach 1:
The patent merges the functionality of multiple separate equalizers into a single equalizer that can handle both closed-loop transmit diversity data signals and STTD encoded pilot signals. The single equalizer processes signals from multiple propagation channels simultaneously, eliminating the need for separate equalizers for each channel while maintaining accurate signal recovery.
Solution Approach 2:
The single equalizer is designed with universal functionality to accommodate different signal types and transmission schemes. It can equalize both closed-loop transmit diversity data signals and STTD encoded pilot signals, making it a multi-functional component that replaces multiple specialized equalizers.
2Reliability
If three equalizers are used to ensure accurate recovery of both CPICH and HS-DSCH, then signal recovery reliability is improved, but manufacturing cost and silicon area increase
Solution Approach 1:
The patent combines the functions of three separate equalizers (one for HS-DSCH and two for CPICH) into a single equalizer that can process both data and pilot signals simultaneously. This merging reduces the total number of components, thereby reducing manufacturing cost and silicon area while maintaining reliability through proper signal separation and processing.
3Adaptability or versatility
If multiple equalizers are used to handle different transmit diversity schemes, then adaptability to various transmission modes is improved, but device complexity increases
Solution Approach 1:
The single equalizer is designed with universal adaptability to handle multiple transmit diversity schemes including closed-loop transmit diversity for data signals and STTD encoding for pilot signals. It incorporates the necessary processing capabilities to accommodate different transmission modes without requiring separate dedicated equalizers for each scheme.
Data Source
AI summary
A receiver for a telecommunications system in which a data signal is transmitted using a closed loop transmit diversity system and a pilot signal is transmitted using a space time transmit diversity system, the receiver comprising an equalizer for equalising a signal received by the receiver, wherein the equalizer is configured to produce an equalized signal in which effects caused by a propagation channel through which the data signal was transmitted are alleviated, the receiver further comprising a processor for processing the equalized received signal to recover the pilot signal.