Huangping Jin

Bit Division Multiplexing for Broadcasting

This paper aims to improve the throughput of a broadcasting system that supports the transmission of multiple services with differentiated minimum signal-to-noise ratios (SNRs) required for successful receptions simultaneously. We propose a novel multiplexing method called bit division multiplexing (BDM), which outperforms the conventional time division multiplexing (TDM) counterpart by extending the multiplexing from symbol level to bit level. Benefiting from multiple error protection levels of bits within each high-order constellation symbol, BDM can provide so-called nonlinear allocation of the channel resources. Both average mutual information (AMI) analysis and simulation results demonstrate that, compared with TDM, BDM can significantly improve the overall transmission rate of multiple services subject to the differentiated minimum SNRs required for successful receptions, or decrease the minimum SNRs required for successful receptions subject to the transmission rate requirements of multiple services.

Scalable Video Broadcasting Using Bit Division Multiplexing

Scalable extension to the H.264/AVC video compression standard (SVC) enables one or more subset bit streams (layers) with multiple qualities to be contained in one high-quality video bit stream, which is a good solution for simultaneous transmission of video programs with different qualities. To fulfill the target of scalable video broadcasting (SVB), the transmission of SVC in broadcasting system uses the physical layer sub-channel technique, and different layers are transmitted in different sub-channels. Bit division multiplexing (BDM) is a newly proposed physical layer sub-channel technique at bit level, which could achieve higher transmission efficiency than conventional time division multiplexing scheme and improve the flexibility of the broadcasting system in conventional hierarchical modulation. In this paper, the combination of SVC and BDM technique is proposed and implemented for SVB. In addition, simplified BDM scheme, BDM-Lite, is also investigated for SVB, which significantly decreases the demapping complexity of the baseline layer due to high-order modulation, which is highly desirable for mobile/handheld receivers. Both simulation and FPGA implementation results show that the proposed BDM-Lite scheme has the advantages of both high transmission efficiency and low complexity of baseline reception.

A suboptimal scheme for uplink NOMA in 5G systems

Non-orthogonal multiple access (NOMA) scheme is a key technique towards the 5th generation (5G) of wireless communication networks due to its higher spectral efficiency comparing to its orthogonal multiple access (OMA) counterpart. However, the complexity of conventional NOMA scheme is extremely high in massive-access scenes. In this paper, we propose a user-pairing based suboptimal scheme for uplink multiple-access by combining NOMA and OMA to facilitate the massive-access scenes. Furthermore, a user-pairing algorithm with O(nlogn) complexity is also derived. According to the Monte Carlo simulation, the proposed scheme shows only a little throughput loss comparing to the optimal transmission scheme in information-theoretic perspective.

Approaching Capacity Region for Two-User GBC With Bit-Division Multiplexing

A two-user Gaussian broadcast channel (GBC) with finite input constellations is addressed in this paper. The constellation-constrained capacity region for the two-user GBC by recently proposed bit-division multiplexing (BDM) is derived. BDM can be seen as a practical implementation of constellation-constrained nonlinear superposition coding (SC). For comparison, the constellation-constrained capacity region for the two-user GBC by traditional constellation-constrained linear SC is also computed. With similar implementation complexity, BDM outperforms traditional constellation-constrained linear SC with lower shaping loss in the capacity defined in this paper. Analytical results show that the upper boundary of the capacity region for the two-user GBC can be well approached by BDM with amplitude phase-shift keying modulation, which could be considered as the preliminary demonstration on the applicability of BDM in practical systems.

A Spectrum Efficient Multi-User Transmission Scheme for 5G Systems With Low Complexity

To maximize the system throughput for downlink multi-user transmission considering fairness among the users, superposition coding (SC) with all the users scheduled simultaneously is optimal. But it would also lead to high implementation complexity at receivers. In this paper, a simplified downlink multi-user transmission scheme is proposed via combining SC and time division multiplexing (TDM). All the users are divided into multiple user groups and only the users within each user group are scheduled simultaneously via SC. Closed-form expression for the system throughput by the proposed scheme is derived and numerical results are provided to demonstrate the difference in the system throughputs by the proposed scheme and the optimal SC as well as TDM. With the proposed scheme, a good tradeoff between performance and complexity can be achieved. It is shown that the proposed scheme can reduce the implementation complexity considerably at the cost of a little system throughput loss.

Backward Compatible Multiservice Transmission Over the DTMB System

In this paper, a backward compatible multiservice transmission scheme over the digital television terrestrial multimedia broadcasting (DTMB) system is proposed, which is based on embedded constellation and bit division multiplexing. With the proposed scheme, simultaneous transmission of original services and multiple augmented services can be supported in the DTMB system in a backward compatible manner. No additional RF spectrum is required and no additional complexity is introduced to the legacy DTMB receivers. Two schemes over the DTMB system are proposed toward two different requirements, which are maintaining the transmission rate of original services and maintaining the reception SNR-threshold of original services, respectively. Average mutual information analysis and bit error ratio simulations are performed. In both schemes, the increment in the throughput of the DTMB system can be over 7.6 Mb/s in typical mode.

Augmented data transmission for DTMB system

An augmented data transmission (ADT) scheme for the Digital Television Terrestrial Multimedia Broadcasting (DTMB) systems based on the technique of embedded constellation is proposed in this paper. With the proposed ADT scheme, the transmission rates of receivers with sufficient good channel conditions are increased at the cost of little impact to the performance of legacy receivers, which is verified by AMI analysis and BER simulation. Additional RF spectrum is not required and no additional complexity is introduced to legacy receivers. Whats more, the proposed ADT scheme is backward compatible with the existing DTMB system.

On two-user degraded GBC with finite input constellations

Two-user Single-Input Single-Output degraded Gaussian broadcast channel (GBC) with finite input constellations is addressed in this paper. Multiple downlink multiple access schemes including orthogonal multiple access (OMA) schemes and non-orthogonal multiple access (NOMA) schemes are compared from several aspects. For OMA schemes, power control is not considered and constant power for each symbol is assumed. For NOMA schemes, two typical schemes are considered which are traditional linear superposition coding (SC) and recently proposed bit division multiplexing (BDM). BDM is essentially an instantiation of non-linear SC. Capacity region analysis and simulation results are performed to give an insight into the downlink multiple access schemes. The results show that BDM can increase the system throughput compared with OMA schemes and has lower implementation complexity as well as better practical performance compared with traditional linear SC. Given typical transmission rate requirements of two users, the gaps to the union theoretical SNR thresholds for two users by BDM are both less than 2.5dB with independent demapping employed at receiver, which are far better than those achieved by OMA schemes and traditional linear SC.

Scalable video transmission system: Design and field trial

Scalable video transmission (SVT) system, which is able to transmit video programs with multiple qualities to different users with different channel and reception conditions, is well designed and implemented on FPGA in this paper. The designed SVT system is based on bit division multiplexing (BDM) technique and H.264/SVC. Capacity region analysis, bit error ratio (BER) simulations and field trial are performed in this paper. The results show that the proposed SVT system has higher spectrum efficiency than the traditional SVT system with redundant source bit streams and time division multiplexing technique. Field trial results show that, with the proposed SVT system, video services with different qualities have different coverage areas.

Bit division multiplexing for MIMO broadcasting system

Simultaneous broadcasting of multiple services in multiple-input and multiple-output (MIMO) broadcasting system is highly desirable. In this paper, the recently proposed technique, bit division multiplexing (BDM), is applied to MIMO broadcasting system, which significantly improves the spectral efficiency of multi-service broadcasting compared with conventional time division multiplexing (TDM) approach. Both average mutual information (AMI) analysis and bit error rate (BER) simulation results demonstrate that BDM can achieve higher overall transmission rate or lower minimum SNR requirement of multiple services. Furthermore BDM in MIMO system may decrease the complexity of MIMO detector accordingly.