Wireless Relay Device Stream Multiplexing via Intermediary
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Solution Overview
Problem
In radio communication systems, increasing the number of multiplexable streams without expanding the number of transmission antennas is challenging due to constraints on antenna spacing and power efficiency, limiting the capacity and transmission rate.
Innovation Solution
A radio relay apparatus with N antenna ports performs diversity reception, divides signals into N streams, and modulates them using a QPSK scheme for transmission, allowing for increased multiplexing without adding antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of transmission antennas is increased to increase multiplexable streams, then the number of multiplexable streams increases, but the device size and complexity increase
Solution Approach 1:
A relay device is introduced as an intermediary between the transmission device and reception device. The relay device includes multiple antenna ports (N≥2) and performs signal processing functions (diversity reception, signal division, QPSK modulation) to enable multiple streams to be transmitted through a single antenna connection to the reception device, thus increasing multiplexable streams without increasing the number of transmission antennas at the original transmitter.
2Reliability
If transmission antennas are installed at larger intervals to reduce channel correlation, then the rank indication increases, but the device size increases
Solution Approach 1:
The relay device serves as an intermediary that performs diversity reception and signal processing, enabling the system to achieve high rank indication without requiring large antenna intervals at the transmission device. The relay device's multiple antenna ports handle the spatial diversity requirements, allowing compact antenna installation while maintaining channel matrix rank.
3Productivity
If the number of transmission antennas is increased to increase multiplexable streams, then the transmission capacity increases, but the power consumption and heat generation increase
Solution Approach 1:
The relay device is positioned as an intermediary that performs signal processing functions, allowing the transmission device to use a single antenna connection while achieving high transmission capacity through the relay's multiple antenna ports. This architecture reduces the power consumption and heat generation at the transmission device by eliminating the need for multiple high-power transmission antenna circuits.
Data Source
AI summary
Disclosed is a wireless relay device wherein the number of stream multiplexes between a wireless transmission device and a wireless reception device can be increased without increasing the number of antennas for the wireless transmission device or the number of antennas for the wireless reception device. Specifically disclosed is a wireless relay device (100) for relaying and transmitting a signal between a wireless transmission device and a wireless reception device, which has Nrelay number (Nrelay is a natural number of 2 or more) of antenna ports, wherein a diversity reception unit (106) diversity-receives the signal which is transmitted from the wireless transmission device, and which has been modulated by the modulation multi-value number of M (where M=Nrelay 2) via the Nrelay number of antenna ports, a stream generating unit (112) divides the signal so as to generate Nrelay pieces of streams, modulation units ((114-1) to (114-Nrelay)) QPSK-modulate the Nrelay pieces of streams, and transmission RF units ((115-1) to (115-Nrelay)) transmit the N pieces of streams after modulation to the wireless reception device via the Nrelay number of antenna ports.