Abstract
Band-limited single-carrier signals, even with a phase-shift keying (PSK) constellation, suffer from relatively high peak-to-average power ratio (PAPR) when a narrow pulse-shaping filter is used at the transmitter. In our recent work, an application of trellis shaping (TS) has been studied extensively for the purpose of reducing PAPR of band-limited single-carrier PSK signals, and it has been shown that a nearly constant envelope signal can be generated even with the use of nearly rectangular pulse-shaping filter. In this paper, we first demonstrate that the uncoded bit error rate (BER) and PAPR reduction capability of the TS considerably depend on the bit labeling. We then propose a new bit labeling for high-order PSK constellation that can efficiently reduce PAPR while achieving BER performance comparable to that of Gray labeling. Finally, the BER of each constellation is theoretically analyzed and compared with the simulation results.
Highlights
Power and bandwidth efficiencies have been two important factors in wireless communications systems
We evaluate the performance of the trellis shaping (TS) with the proposed labeling as well as conventional labelings in terms of peak-toaverage power ratio (PAPR) reduction capability and bit error rate (BER) performance through computer simulations
We choose 32-phase-shift keying (PSK) as an example in all the simulation results for trellis shaping, but similar results have been obtained for the PSK with other orders as long as M ≥ 16
Summary
Power and bandwidth efficiencies have been two important factors in wireless communications systems. Strictly band-limited signals suffer from high peak-toaverage power ratio (PAPR). Linear amplification of high PAPR signals requires a large backoff operation of power amplifier, which results in a considerable penalty in terms of power efficiency. Single-carrier signals have been adopted for the uplink of generation communications [1] mainly due to its low PAPR property compared to multicarrier signals. If the bandwidth of the generated signal is severely limited by the use of narrow pulse-shaping filter, its envelope experiences considerable fluctuation, resulting in high PAPR. In this case, reduction of PAPR is critical
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