Abstract
In cooperative relaying, intermediate stations are required to enhance the end-to-end transmission performance. The performance of the cooperative relaying scheme has been investigated theoretically and via computer simulations. However, cooperative relaying using transmit diversity techniques in actual environments has not been investigated thus far. This paper presents an experimental system for distributed cooperative relaying using space-time block code and evaluations of its transmission performances in real propagation channels. To this end, four wireless stations—specifically, one source, two relays, and one destination—were developed using analog transceivers and field-programmable gate arrays for real-time digital signal processing. Sample timing and frequency synchronizations among the four wireless stations were established by using the received signals as a reference. The end-to-end error performance of distributed cooperative relaying was compared to those of noncooperative relaying schemes, and the performances of three relaying schemes were evaluated quasisimultaneously in terms of their cumulative distribution functions of the bit-error ratios (BERs). The experimental results indicated that the BER performance of the two-hop distributed cooperative relaying scheme was substantially superior to those of noncooperative two-hop relaying schemes, including a route diversity scheme.
Highlights
Cooperative communication is a novel form of wireless communication that requires intermediate stations in addition to the source and destination stations
The Source and Destination vehicles moved as slowly as possible and occasionally stopped at the traffic lights. While these vehicles were in motion, the measurement setups were used to record the bit-error ratios (BERs) and received signal strength indicator (RSSI) of the three relaying schemes every second
The experimental results showed that the BER performance of the two-hop distributed cooperative relaying scheme based on the space-time block code (STBC) was substantially superior to those of noncooperative two-hop relaying schemes, including a route diversity scheme
Summary
Cooperative communication is a novel form of wireless communication that requires intermediate stations in addition to the source and destination stations. Cooperative communication schemes can improve the end-to-end transmission performance at the expense of additional intermediate (relay) stations. Dohler et al [5] proposed distributed cooperative relaying schemes, where multiple relay stations cooperatively relayed signals from the source station using a space-time block code (STBC) to improve the end-to-end transmission performance. In the STBC-based cooperative relaying scheme, multiple relay stations operate together using the STBC technique so that a receiving station ( relay station or destination station) benefits from the transmit diversity gain. The performance of the STBC-based cooperative relaying scheme was investigated in depth via computer simulations [6].
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