This paper develops an interference aware design for cooperative hybrid automatic repeat request (HARQ) assisted non-orthogonal multiple access (NOMA) scheme for large-scale device-to-device (D2D) networks. Specifically, interference aware rate selection and power allocation are considered to maximize long term average throughput (LTAT) and area spectral efficiency (ASE). The design framework i...

あらまし 次世代の移動無線通信では,高速高品質のパケット伝送が求められている.ところで,無線アクセスとして MC-CDMA が有力視 されている.無線パケット伝送では,誤り訂正符号化と自動再送(ARQ)を組み合わせたハイブリッド ARQ(HARQ)が重要な技術である.本 稿では,再送ごとにマルチキャリア(MC-)CDMA の拡散率を変え,周波数ダイバーシチ効果と符号化効果をうまく利用することでスループ ットを向上させるMC-CDMA HARQ を提案している.計算機シミュレーションにより周波数選択性フェージング環境下におけるスループッ トを求め,再送回数によらず常に固定の拡散率を用いる HARQ との比較を行っている.シミュレーション結果より,提案方式は再送回数を 減らすことができ,平均受信 Es/N0 全体に渡って従来の HARQ より良好なスループット特性が得られることを示してい...

Multi-carrier code division multiple access (MC-CDMA) is a promising wireless access technique for the next generation mobile communications systems, in which broadband packet data services will dominate. Hybrid automatic repeat request (HARQ) is an indispensable error control technique for high quality packet data transmission. The HARQ throughput performance of multi-code MC-CDMA degrades due...

In this paper, we propose a rate-compatible (RC) parallel concatenated punctured polar (PCPP) codes for incremental redundancy hybrid automatic repeat request (IR-HARQ) transmission schemes, which can transmit multiple data blocks over a time-varying channel. The PCPP coding scheme can provide RC polar coding blocks in order to adapt to channel variations. First, we investigate an improved rand...

It has been known that adaptive modulation and coding (AMC) at the physical layer can be combined with a truncated automatic repeat request (ARQ) at the data link layer so as to maximize the spectral efficiency under prescribed delay and error performance constraint. In this paper, we consider the same joint design approach when incremental redundancy-based hybrid ARQ (IR-HARQ) is associated wi...

– In anticipation of the high demand for wireless data services, several wireless standards are evolving to support packed data more efficiently. In UMTS, a new, shared channel called the High Speed Downlink Shared Channel (HS-DSCH) that multiplexes packet data users has been defined. Several performance-enhancing technologies are included in High Speed Downlink Packet Access (HSDPA): Adaptive ...

The implementation of uplink HARQ in a CloudRadio Access Network RAN (C-RAN) architecture is constrained by the two-way latency on the fronthaul links connecting the Remote Radio Heads (RRHs) with the Baseband Units (BBUs) that perform decoding. To overcome this limitation, this work considers an architecture based on the separation of control and data planes, in which retransmission control de...

Rate-compatible Turbo codes are part of many mobile communication systems as, e.g., LTE. The code rate of a fixed-rate mother Turbo code is adapted by bit puncturing and bit repetition. While bit puncturing allows to flexibly increase the effective code rate by discarding a certain number of encoded bits, bit repetition facilitates lower effective code rates by duplicating a distinct number of ...